Final test on strength. Test “Forces in nature. Friction force arises
Test "Strength" 7 cl.
Option I
1. What is the SI unit of gravity?
2. What formula is used to find the elastic force?
A) gravity,
B) elasticity,
C) friction,
D) body weight
4. What is the force of gravity acting on a body weighing 10 kg?
F 1 = 3 H F 2 = 7 H
6. What device is used to measure the force of gravity?
7. What is the stiffness of the spring if it lengthened by 5 cm with a force of 50 N?
A) 10 N / kg B) 250 N / kg C) 0.1 N / kg D) 1000 N / kg
8. What is the mass of a body if it is acted upon by a force of gravity equal to 100 N?
F.I. Date: Option No. |
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Test "Strength" 7 cl.
Option II
1. In what units is the elastic force measured in the SI system?
A) kilogram, B) meter, C) second, D) Newton
2. What formula should be used to find the force of gravity?
A) F = mg, B) F = k ∆ l, C) F = pS, D) p = F: S
3. What is the force shown in the figure?
A) gravity,
B) elasticity,
C) friction,
D) body weight
4. What is the force of gravity acting on a body weighing 1 kg?
A) 10 N B) 100 N C) 0 N D) 0.1 N
5. What is the resultant of the two forces acting on the body (shown in the figure)?
F 1 = 3 H F 2 = 7 H
6. What device is used to measure the elastic force?
A) scales, B) stopwatch, C) dynamometer, D) tape measure
7. How much is the spring with a stiffness of 50 N / kg elongated if a force of 5 N acts on it?
A) 10 m B) 250 m C) 0.1 m D) 55 m
8. What is the mass of a body if it is acted upon by a force of gravity equal to 10 N?
A) 10 kg B) 100 kg C) 1 kg D) 0.1 kg
9. What was the most difficult test question for you?
A) 1 B) 2 C) 3 D) 4 E) 5 F) 6 G) 7 H) 8
F.I. Date: Option No. |
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All-Russian competition for the best methodological development « Verification work in physics "" Forces in nature "
Compiled by the physics teacher OGBOU "boarding school №89 for children with disabilities" - Salikhova E.A.
Ulyanovsk
Test "Forces in nature"
7th grade
The test was developed by a physics teacher, to the textbook Peryshkin A.V. Grade 7 for children with disabilities health.
Comments for the teacher on assignments and their grades
The test on the topic "Forces in nature" contains 7 tasks of three levels of difficulty. \ Level A- basic. There are 3 answer options for each item of this level, only one of which is correct.
Level B- more difficult. Each task at this level requires a short answer.
Level C- increased complexity. When performing tasks of level C, it is required to bring the solution of the problems.
This test takes 40 - 45 minutes to complete. The correct answers should be circled.
Criteria for evaluating responses
Different forms of assessment are used depending on the type of assignment.
For each correctly completed task of Part A, 1 point is awarded.
For each correctly completed task of part B, from 1 to 2 points are awarded, depending on the answer to the task.
Part C consists of two tasks to be accomplished. For each criterion, the student receives points, which add up the total score.
| Criteria for evaluating the answer to task C | Score |
| The complete correct solution is provided, including the following elements: Correctly written formulas expressing physical laws; The necessary mathematical transformations and calculations are given, leading to the correct answer, and the answer is presented | |
| The necessary formulas are written correctly, the answer is written correctly, but the transformations leading to the answer are not presented, or in mathematical transformations or calculations an error was made that led to the wrong answer. | |
| The solution contains an error in the necessary mathematical transformations or does not take into account the ratio for determining the value | |
| Maximum amount points for the task |
Physics test grade 7 on the topic "Forces in nature"
In what units is force measured
A) Kilogram; B) Meter; C) Newton.
2. What is the name of the force with which the elephant is attracted to the ground? Picture 1?
Picture 1
A) severity; B) Elasticity; C) Friction.
3. Crocodile Gena plays the harmonica. What is the force generated when the accordion is stretched and compressed? Picture 2
Picture 2
A) severity; B) Elasticity; C) Friction.
4. What is the force with which the bear acts on the support? Figure 4.
Figure 4
A) Elasticity; B) Weight; C) Severity.
Level B
5. Why do the clamps lubricate the door hinges? Figure 3. Explain the answer.
Answer:___________________________________________________________________________________________________________________________________________
Level C
6. Two teams tug-of-war. Determine the resultant force.
F1 = 9H F2 = 2H F3 = 4H F4 = 6H
A) 1H; B) 0 H; B) 11H.
7. A boy weighing 25kg put a 5kg briefcase on his shoulders. Determine the force with which the boy with the briefcase presses on the floor?
A) 250H; B) 300H; B) 300Pa.
| Job No. |
Physics Test Strength for grade 7 students with answers. The test consists of 4 variants, each variant contains 20 tasks.
Option 1
1. What phenomenon occurs with a rubber tourniquet when, taking it by the ends, they spread their arms to the sides?
1) Compression deformation
2) Torsional deformation
3) Tensile deformation
4) Bending deformation
2. When is it said that a force acts on the body?
1) When a person acts on the body
2) When the body drives the engine
3) In the event of the action of the same body on him
4) When there is any interaction of the body with other bodies
3. Gravity is called universal because
1) all bodies in the world are attracted to each other
2) all planets Solar system attracted to each other
3) The sun attracts all the planets
4. How does the gravity of bodies depend on their mass?
1) Does not depend
2) The greater the mass of bodies, the less their attraction to each other
3) The greater the mass of bodies, the stronger their attraction
4) There is no right answer
5.
1) the body pulls the Earth
2) the body is attracted by the Earth
3) the body is attracted by the Sun
4) the body interacts with other bodies
6. Where will the force of gravity acting on bodies be greater - at the pole or at the equator?
1) At the equator
2) At the pole
3) She is the same
7. What phenomenon causes the emergence of the elastic force?
1) Attraction of bodies by the Earth
2) Universal gravitation
3) Inertia
4) Deformation
8. Which formula expresses Hooke's law?
1) F = gm
2) m = ρV
3) F = kΔl
4) P = F heavy
9. For which of the deformations indicated here is Hooke's law applicable?
1) A piece of lead is flattened by a hammer blow
2) The spring stretched under the weight of the suspended load, and when the load was removed, it did not shrink to its previous state
3) The spring was compressed, and then released, and it returned to its original state
4) When hammering in a nail, it bent
10. What force is called weight?
1) With which the body acts on the support or suspension
2) With which the body is attracted to the Earth
3) With which the support acts on the body on it
11. Which of the drawings has the letter F stands for body weight?
1) №1
2) №3
3) №2
4) There is no such pattern
12. What physical quantity is measured in newtons?
1) The density of the substance
2) Strength
3) Body mass
4) Its volume
13. Calculate the force of gravity acting on a 20 kg box.
1) 2 N
2) 20 N
3) 200 N
4) 100 N
14. Determine the weight of the cylinder from the figure shown.
1) 120 N
2) 102 N
3) 98 N
4) 125 N
15. The dynamometer shown in the figure shows the weight of the cylinder, equal to
1) 0.5 N
2) 9 N
3) 8.5 N
4) 9.5 N
16. The forces acting on the stone are shown in the figure. What is their resultant force?
1) 8 N
2) 9 N
3) 25 N
4) 2 H
17. Find the resultant forces.
1) 4 N
2) 8 N
3) 12 N
4) 24 N
18. What force stops the sled from rolling down the hill?
1) Gravity
2) Weight
3) Friction force
4) Strength of elasticity
19. Which type of friction is the lowest friction force?
1) Rest friction
2) Rolling friction
3) Sliding friction
4) The friction force is always the same
20. Surface lubrication
1) increases the force of friction
2) eliminates friction
3) does not change the friction force
4) reduces frictional force
Option 2
1. The man presses on the inflatable mattress. What phenomenon occurs in this case?
1) Tensile deformation
2) Compression deformation
3) Torsional deformation
4) Bending deformation
2. The word "strength" means that
1) the body interacts with another moving body
2) the same body acts on the body
3) any interaction of the body with other bodies occurs
4) other bodies act on the body
3. Gravity is called universal because
1) all bodies are attracted to the earth
2) all bodies are attracted to each other
3) all planets are attracted to the sun
4) all planets are attracted to each other
4. How does the attraction of bodies depend on the distance between them?
1) Does not depend
2) The greater the distance, the weaker the attraction
3) The smaller the distance, the weaker the attraction
5.
1) the earth attracts all bodies
2) the sun pulls the earth
4) the stars attract the sun
6. Should a person or a ship experience a lot of gravity?
1 person
2) Ship
3) The forces of gravity will be the same
4) There is no right answer among the answers
7. At what point does the elastic force become zero?
1) When the deformation disappears
2) When the deformation of the body is maximized
3) When the body begins to deform
4) When it starts to regain its shape and size
8. The elastic force according to Hooke's law is
1) F control = F heavy
2) s = vt
3) m = ρV
4) F = kΔl
9. What deformations are elastic?
1) Very small
2) Very large
3) Those in which the body, after removing the load, takes on its original dimensions and shape
4) Such, in which the body does not collapse
10. Weight is the strength with which
1) the body is attracted to the Earth
2) the body, being attracted to the Earth, acts on a support or suspension
3) deformed support acts on the body
4) there is no right answer
11. Which of the drawings has the letter F denotes the force of gravity acting on the body?
1) №1
2) №2
3) №3
4) there is no such pattern
12. Newton is a unit of measurement
1) masses
2) density
3) surface area
4) strength
13. Determine the force of gravity acting on a body whose mass is 500 g.
1) 0.5 N
2) 5 N
3) 50 N
4) 500 N
14. Find out from the dynamometer shown here how much force is applied to the bar to move it.
1) 3 H
2) 2 N
3) 1.5 N
4) 2.5 N
15. What is the weight of the load shown in the dynamometer shown in the figure?
1) 70 N
2) 10 N
3) 20H
4) 15 N
16. A box placed on a shelf is subjected to a gravity force of 60 N and an elastic force from the shelf. What is their resultant force?
1) 60 N
2) 120 N
3) 0 N
4) It is impossible to answer, since the modulus of elasticity is not indicated
17. The same bag was placed on top of a 1 kg bag of sugar lying on the table. What is the resultant force with which these packets act on the table?
1) 20 N
2) 2 N
3) 10 H
4) 15 N
18. What causes the ball rolling on the ground to stop?
1) Earth Gravity
2) Inertia
3) Deformation
4) Friction
19. Which of the figures with images of moving bodies shows the case of manifestation of static friction?
1) №1
2) №2
3) №3
4) There is no such pattern
20. Aligning the surfaces of touching bodies
1) reduces friction
2) increases it
3) eliminates friction
4) does not change it
Option 3
1. What phenomenon happens to metal under pressure?
1) Compression deformation
2) Torsional deformation
3) Tensile deformation
4) Bending deformation
2. It is said that the body is acted upon by force when
1) it interacts with a body of the same mass
2) other bodies do not act on the body
3) the body is involved in any interaction with other bodies
4) the body is deformed
3. Universal gravity is
1) the attraction of all bodies to the Earth
2) the attraction of all planets to each other
3) attraction of all celestial bodies to each other
4) mutual attraction of all bodies of the Universe
4. The distance between the bodies has decreased. How has their attraction to each other changed?
1) Remains the same
2) Increased
3) Decreased
4) First it increased, then it decreased
5. Gravity is the force with which
1) all bodies are attracted by the earth
2) the sun attracts the earth to itself
3) the sun attracts the planets
4) all bodies in the world are attracted to each other
6. Which of the climbers will be affected by a large force of gravity: a) the one who starts the ascent, or b) the one who has already reached the summit?
1) a
2) b
3) There will be no differences in gravity
4) There is no right answer among the answers
7. At what point does the elastic force reach its maximum value?
1) When the body begins to deform
2) When the deformation becomes the largest
3) When the body regains its volume and shape
4) When the deformation disappears
8. According to Hooke's law, the elastic force is calculated by the formula
1) F = gm
2) s = v cf t
3) Ftyach = P
4) F = kΔl
9. In which of the named cases Hooke's law cannot be applied?
1) A children's ball jumps up and down on an elastic band
2) The child pulls a multi-colored flexible toy spring
3) After removing the load, the spring coils remained stretched
4) Such a case is not named here
10. Why don't gravity and weight balance each other?
1) Because they are not equal
2) Because they act in one direction
3) Because they are attached to different bodies
4) There is no correct answer
11. In which picture is the letter F stands for the strength of elasticity?
1) №1
2) №2
3) №3
4) There is no such pattern
12.
1) Kilograms (kg)
2) Kilometers (km)
3) Meters (m)
4) Newtons (N)
13. Determine the force of gravity acting on the 8kg canister.
1) 0.8 N
2) 8 N
3) 80 N
4) 800 N
14. From the readings of the dynamometer shown in the figure, find out what gravity is acting on the disk.
1) 18 N
2) 15.5 N
3) 16 N
4) 20 N
15. What is the body weight?
1) 40 N
2) 50 N
3) 45 N
4) 41 N
16. The brick is lifted by applying a force of 15 N. The force of gravity acting on it is 10 N. What is the resultant of these forces?
1) 25 N
2) 5 N
3) 50 N
4) 250 N
17. The ball is acted upon by two forces, shown in the figure: F 2= 60 N and F 1= 20 N. What is their resultant force?
1) 40 N
2) 60 N
3) 120 N
4) 80 N
18. What force stops the car when the engine is off?
1) Weight
2) Gravity
3) Friction force
19. What type of friction causes the greatest frictional force?
1) Sliding friction
2) Rolling friction
3) Rest friction
4) These frictional forces are approximately the same
20. Balls roll on the surface of the table, which are acted upon by gravity forces equal to: a) 0.1 N; b) 0.3 N; c) 0.5 N. Which of them is affected by the smallest friction force?
1) a
2) b
3) in
4) The forces of friction in these cases are the same
Option 4
1. Thin wires are twisted into a bundle. What phenomenon happens to them in this case?
1) Bending deformation
2) Tensile deformation
3) Compression deformation
4) Torsional deformation
2. The term "strength" is used to briefly indicate that
1) any other body acts on the body
2) no other bodies act on it
3) when interacting with other bodies, it moves
4) as a result of interaction with surrounding bodies, it stops
3. Universal gravitation is the attraction of bodies to each other. It depends on
1) body masses
2) the distance between them
3) the speed of bodies
4) on the distance between bodies and their masses
4. In which case will the attraction of the bodies be greater: a) when two ships with cargo pass by each other, or b) when boats with rowers are at the same distance?
1) a
2) b
3) It will be the same
5. Gravity is the force with which
1) the body acts on the support
2) the earth attracts the body
3) other bodies attract this body
4) the body attracts other bodies
6. Where will the large force of gravity act on the ship - at the pole or at the equator?
1) At the pole
2) At the equator
3) This power is the same everywhere
7. Under what condition are the moduli of gravity and elastic force equal?
1) When the deformation is small
2) With the growth of deformation
3) When the deformation and with it the elastic force increase so much that the elastic force balances the force of gravity
4) With a decrease in the load causing deformation
8. To determine the elastic force, you need to use Hooke's law. It is expressed by the formula:
1) F control = F heavy
2) P = F heavy
3) F = gm
4) F = kΔl
9. What deformations are called elastic?
1) Such, in which the body is destroyed
2) Those after which the body returns to its original size and shape
3) which cause a persistent change in body shape
4) Which cause a change in the volume of the body that does not disappear over time
10. How does weight depend on body weight?
1) The more body weight, the more weight
2) The less body weight, the more weight
3) Weight does not depend on body weight
4) There is no correct answer among the answers
11. In which picture is the letter F stands for weight?
1) №1
2) №2
3) №3
4) There is no such pattern
12. In what units is force measured?
1) Kilograms and grams
2) Meters and kilometers
3) Newtons and kilonewtons
4) There is no right answer
13. Find the force of gravity acting on a vase of flowers if its mass is 1.5 kg.
1) 1.5 N
2) 15 N
3) 150 N
4) 1500 N
14. Determine the bar weight from the dynamometer shown in the figure
1) 1.6 N
2) 14 N
3) 160 N
4) 1600 N
15. The bag was filled with 20 kg of granulated sugar. How has the weight of the bag changed?
1) Increased by 20 N
2) Increased by 10 N
3) Increased by 200 N
4) Has not changed
16. Forces act on the box F 1= 45 N and F 2= 30 N shown in the figure. What is their resultant force?
1) 75 N
2) 50 N
3) 25 N
4) 15 N
17. Determine the resultant forces F 1= 30 Ni F 2= 20 N acting on the trolley.
1) 50 N
2) 30 N
3) 20 N
4) 10 N
18. What phenomenon is the reason for the impossibility of inertial movement of transport?
1) Universal gravitation
2) Attraction to Earth
3) Friction
4) The action of the forces of gravity and elasticity
19. What kind of friction is applied when the trolley moves?
1) Sliding friction
2) Rolling friction
3) Friction at rest
20. In which of the named cases is friction increased?
1) Oil is dripping into the keyhole
2) Fill the rollers with water
3) Grooves are made on the soles of winter shoes
4) Sled runners are made smooth
Force Physics Test Answers
Option 1
1-3
2-4
3-1
4-3
5-2
6-2
7-4
8-3
9-3
10-1
11-3
12-2
13-3
14-1
15-2
16-4
17-3
18-3
19-2
20-4
Option 2
1-4
2-3
3-2
4-2
5-1
6-2
7-1
8-4
9-3
10-2
11-3
12-4
13-2
14-4
15-4
16-3
17-1
18-4
19-4
20-1
Option 3
1-1
2-3
3-4
4-2
5-1
6-1
7-2
8-4
9-3
10-3
11-4
12-4
13-3
14-1
15-3
16-2
17-4
18-3
19-3
20-1
Option 4
1-4
2-1
3-4
4-1
5-2
6-1
7-3
8-4
9-2
10-1
11-3
12-3
13-2
14-2
15-3
16-4
17-1
18-3
19-2
20-3
Force physics test grade 7 with answers. The test includes 3 options. Each version has 6 tasks.
Option 1
1. In the course of interaction of two bodies, they have….
1) both shape and speed can change
2) neither speed nor shape changes
3) only the form changes
4) only speeds change
2. The result of the action of force depends….
1) only from the module of this force
2) only from the direction of this force
3) only from the point of application of this force
4) and from the module, and from the direction, and from the point of application of the force
3. The modulus of the elastic force of the stretched rope (k is the rigidity of the rope), shown in the right figure, is equal to….
1) kl
2) kl 0
3) k (l - l 0)
4) k (l + l 0)
4. Gravity is the force with which….
1) the earth attracts the body
2) the body attracts the Earth to itself
3) the body is attracted to the mass standard
4) the body presses on the scales
5. The value of the sliding friction force depends on….
1) only from the material of the contacting bodies
2) only on the degree of their processing (roughness)
3) only from the force pressing one body to the surface of another
4) from all of the above factors
6. The force acting from the finger on the orange and the resultant force applied to this orange are respectively equal….
1) 4 N and 1 N
2) 1 N and 0 N
3) 4 N and 0 N
4) 1 N and 4 N
Option 2
1. A body influenced by another body can change….
1) only numerical value of speed
2) only direction of speed
3) only the form
4) and the numerical value of the speed, and its direction, and shape
2. Change in the velocity vector of a body when a force acts on it….
1) depends only on the modulus of this force
2) depends only on the direction of this force
3) depends on both the modulus of force and its direction
4) does not depend on either the modulus of force or its direction
3. The modulus of the elastic force of the compressed spring (k is the stiffness of the spring), shown in the right figure, is equal to….
1) kl
2) kl 0
3) k (l - l 0)
4) k (l + l 0)
4. The value of the force of gravity acting on the body depends on….
only from body weight
only from the height at which the body is
only from the latitude of the point at which the body is located
from all of the above factors
5. The friction force is measured when a metal bar moves over a plate of the same material, gradually polishing both contacting surfaces. As the bar and plate become smoother, the frictional force will be….
1) constantly decrease
2) constantly increase
3) stay the same
4) first decrease, then increase
6. The force acting on the eggplant from the side of the finger and the resultant force applied to this eggplant are respectively equal….
5 N and 0 N
5 N and 2 N
3 N and 0 N
3 N and 5 N
Option 3
1. The body, acting on another body,….
1) can change its speed, but cannot change its shape
2) can change both its speed and its shape
3) can change its shape, but cannot change its speed
4) cannot change either its speed or its shape
2. First, a force was applied to the center of the rod on the table. Then a force of the same magnitude and direction was applied to the end of the rod, while the nature of the movement of the rod….
1) will not change, since in both cases the forces are equal in modulus
2) will not change, since in both cases the forces are equally directed
3) will change, since the point of application of the force in these two cases is different
4) may remain the same, or may change, since the force can be directed both along the rod and at an angle to it
3. If l 0 is the length of the unstretched spring, and l is the stretched one, k is the stiffness of the spring, then the modulus of the elastic force of the stretched spring is equal to….
1) kl
2) kl 0
3) k (l - l 0)
4) k (l + l 0)
4. On which bodies (house, moon, leaf falling from a tree) does the force of gravity constantly act?
only to the house
only to the moon
only on a leaf falling from a tree
on all the bodies listed above
5. The cause of the friction force between two bodies….
1) is associated only with the mutual repulsion of molecules on the surface of bodies
2) is associated only with the mutual attraction of molecules located at the contact points of bodies
3) is associated with both attraction and repulsion of molecules located at the places of contact of bodies
4) is not associated with the interaction of molecules of contacting bodies
6. The distance between the nearest divisions of the spring scales shown in the figure is 1 cm. The spring rate of the dynamometer is approximately equal to….
1) 1000 N / m
2) 500 N / m
3) 140 N / m
4) 10 N / m
Answers to the test in Physics Strength 7th grade
Option 1
1-1
2-4
3-3
4-1
5-4
6-2
Option 2
1-4
2-3
3-3
4-4
5-4
6-3
Option 3
1-2
2-4
3-3
4-4
5-3
6-1
Physics grade 7. Test on the topic "Strength".
1.When two bodies interact, they have:
A) Only speed changes
B) Only the form changes
C) Speed and shape do not change
D) Shape and speed may change
2. On which bodies: a car, the moon, a brick falling from a height, does gravity constantly act?
A) Only for a car
B) Only to the moon
C) Only on a brick falling from a height
D) For all the bodies listed above
3. The ball, released from the hands, falls to the ground. What is the force causing the ball to fall?
A) Gravity
B) Ball weight
B) Elastic force
4 What is the phenomenon that causes the elastic force?
A) Universal gravitation
B) Deformation
C) Inertia
D) Gravity
5. Strength is measured in ...
A) Newtons
B) Joules
B) Watts
6) What formula expresses Hooke's law?
6) What is the phenomenon
A) F = pS. B) A = sF.
B) M = Fl. D) P = gm.
3. Express in kilojoules the work equal to 7000 J, 6300 Nm and 75 J.
A) 7 kJ, 6.3 kJ, 0.075 kJ. B) 7 kJ, 63 kJ, 0.75 kJ.
B) 70 kJ, 63 kJ, 0.75 kJ. D) 70 kJ, 6.3 kJ, 0.75 kJ.
4. To what height did the crane lift a load weighing 1.5 tons, if the work performed by it is equal to
A) 4 m. B) 0.4 m.
B) 40 m. D) your answer.
5. Power is calculated by the formula -
6. Power is measured in ...
A) ... Newtons. B) ... Pascals.
B)… watts D)… joules.
7. What is the power of a person pulling a bag of sand and doing 48 kJ work in 10 minutes?
A) 4.8 watts. B) 8 W.
B) 4800 W. D) 80 W.
8. The illustration shows the lever. What is the moment of force and? 
A) AXIS OF. C) SV and SV.
B) OS and OB. D) CB and CB.
9. The block system gives a power gain of 6 times. How many moving blocks should there be?
10. Calculating the efficiency of the mechanism, the student received different answers. Which one can't be right exactly?
A) 106%. B) 88%.
B) 72%. D) 56%.
11. A load weighing 100 kg is suspended on the short arm of the lever. To lift it, a force of 250 N was applied to the long arm. The load was raised to a height of = 0.08 m, while the point of application of the driving force dropped to a height of = 0.4 m. Find the efficiency of the lever.
A) 65%. B) 102% /
B) 80%. D) your answer .
