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Force and Laws of Motion

Total questions: 40

Worksheet time: 30mins

Name
Class
Date
1.

A block of weight 5 units is placed on a horizontal table. A person pushes the block from top by exerting a downward force of 3 units on it. What is the total force exerted by the table on the block.

a)

5N

b)

2N

c)

8N

d)

3N

2.

The unit of force is

a)

m/s

b)

m/s2

c)

kgm/s2

d)

Nm2kg-2

3.

What are the forces acting on a car moving down the road

a)

Air drag

b)

Gravitational force

c)

Friction force

d)

Electrostatic force

4.

A body is moving in a straight line with constant speed. The unbalanced force acts

a)

in the direction of motion of body

b)

in opposite direction of motion

c)

in perpendicular direction

d)

none of these

5.

A and B are two objects with masses 6 kg and 34 kg respectively. Which has more inertia?

a)

A

b)

B

c)

Equal inertia

d)

None of these

6.

Action and reaction according to Newton's third law

a)

Acts on same body in same direction

b)

Acts on different bodies in same direction

c)

Acts on different bodies in different directions

d)

Acts on same body in different directions

7.

Which of the following is not an example of

Newton’s third law of motion?

a)

Walking

b)

Swimming

c)

Seatbelt

d)

Recoil of gun

8.

Which Newton’s law of motion defines force?

a)

First

b)

Second

c)

Third

d)

Fourth

9.

Which laws comes into picture here

a)

Moment of Inertia

b)

Conservation of Momentum

c)

Newton's Third law

d)

Universal law of gravitation

10.

The three types of inertia are

a)

motion, rest and direction

b)

motion, rest and mass

c)

motion, rest and shape

d)

motion, rest and behaviour

11.

The amount of matter in an object is called

a)

Force

b)

Strength

c)

Mass

d)

Density

12.

A force that makes an object move in a circle is called

a)

Gravitational force

b)

Centrifugal force

c)

Centripetal force

d)

Rotatory force

13.

You can increase the momentum of an object by

a)

decreasing its velocity

b)

increasing its mass

c)

decreasing its mass

d)

increasing its velocity

14.

What is force of a skydiver who has a mass of 100kg and accelerates at a speed of 9.8m/s2?

a)

98N

b)

980N

c)

9800N

d)

9.8N

15.

9. Principle of conservation of linear momentum

can be deduced from Newton’s

a)

1st Law

b)

2nd Law

c)

3rd Law

d)

4th Law

16.

In a tug-of-war between the term A and B, the rope breaks at a point which is nearer to A.

Then

a)

A has applied more force

b)

B has applied more force

c)

A and B have applied equal force

d)

None of these

17.

Mass of a body is doubled. How does its acceleration change under the acceleration of same force?

a)

Remains same

b)

Doubles

c)

Halves

d)

Triples

18.

Changes that a force can bring on a non-rigid body fixed at a point are

a)

Speed and direction

b)

Speed and shape

c)

Shape and size

d)

size and direction

19.

If a paper ball and paper sheet of same mass is dropped from the same height, then which one will reach the ground first if air resistance is neglected?

a)

Paper ball

b)

Paper sheet

c)

Both at the same time

d)

None of these

20.

What is the constant that equates the proportional relation between force and acceleration

a)

Strength

b)

Momentum

c)

Mass

d)

Acceleration

21.

A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

a)

accelerated

b)

uniform

c)

retarded

d)

along circular tracks

22.

Dry leaves fall when a tree is shook because of

a)

Momentum

b)

Force

c)

Inertia

d)

Acceleration

23.

A number of forces acting on a body changes velocity of the body. The forces cannot be

a)

Paralleled

b)

Balanced

c)

Inclined

d)

Unbalanced

24.

Newton’s third law is equivalent to the

a)

law of conservation of energy

b)

law of conservation of angular momentum

c)

law of conservation of linear momentum

d)

law of conservation of energy and mass

25.

A body, whose momentum is constant, must have constant

a)

force

b)

velocity

c)

acceleration

d)

all of these

26.

Choose the correct option

a)

Action and reaction forces act on same object

b)

Action and reaction forces act on different objects

c)

Both a and b are possible

d)

Neither a nor b is correct.

27.

Two bodies of equal masses (m) moving with equal speed (v) in opposite directions collide and stick to each other. The resultant velocity of the combination is

a)

v

b)

2v

c)

v/2

d)

zero

28.

A hockey player pushes the ball on the ground. It comes to rest after travelling certain distance because

a)

the player stops pushing the ball

b)

balanced force acts on the ball

c)

the opposing force acts on the ball.

d)

none of these

29.

How much force acts on a body whose momentum p is constant with time t ?

a)

One

b)

2p/t

c)

t/2p

d)

zero

30.

Another name for momentum is

(a)  

31.

In any interaction between two or more isolated objects, the total (a)   does not change.

32.

Particle is at rest if force is zero

a)

True

b)

False

33.

Particle moves in the direction of force.

a)

True

b)

False

34.

CGS unit of force is

(a)  

35.

When a horse pulls the cart, even the cart pulls the horse with same amount of force

a)

True

b)

False

36.

Force acting on a body can be reduced by increasing the smoothness of the surface of the body

a)

True

b)

False

37.

A cricket player moves his hand backward while catching the ball? Which principle is involved here?

a)

1st Law

b)

Inertia

c)

Conservation of momentum

d)

3rd Law

38.

Two identical bullets are fired one by a light rifle and the other by a heavy rifle with the same force. Which rifle will hurt the shoulder more?

a)

Heavy rifle

b)

Light rifle

c)

Both

d)

Both will not hurt

39.

Can momentum of a body be negative?

a)

Yes

b)

No

40.

Which one of these is a fundamental force of nature

a)

Frictional force

b)

Muscular force

c)

Strong Nuclear force

d)

Molecular force

e)

Life force