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Physics — Force And Laws Of Motion

50 Questions Class 9 MCQs
1
Which of the following is a balanced force?
2
Newton’s First Law of Motion is also called:
3
An object continues in its state of rest or uniform motion unless acted upon by an external force. This is:
4
Inertia of motion means:
5
The unit of force is:
6
Which of these is an example of Newton’s First Law?
7
Momentum is defined as:
8
SI unit of momentum is:
9
Rate of change of momentum is equal to:
10
Newton’s Second Law of Motion gives:
11
Which one is an example of Newton’s Third Law?
12
Newton’s Third Law states:
13
The recoil of a gun is an example of:
14
A ball hitting a bat and bat pushing the ball is an example of:
15
The property of an object to resist change in its state is called:
16
A passenger falls backward when a bus suddenly accelerates. This is due to:
17
The SI unit of force is named after:
18
Momentum is a:
19
When two bodies collide, total momentum is conserved if:
20
Law of conservation of momentum states:
21
Which of the following shows inertia of direction?
22
A cricketer lowers his hands while catching a ball to:
23
A body of mass 5 kg has momentum 25 kg·m/s. Its velocity is:
24
A body of mass 10 kg is moving with velocity 2 m/s. Its momentum is:
25
A force of 50 N is applied on a body of mass 10 kg. The acceleration produced is:
26
Which of the following is not an example of Newton’s Third Law?
27
A rocket works on the principle of:
28
Which law defines force quantitatively?
29
The SI unit of force is equivalent to:
30
A person jumping from a boat pushes the boat backward. This is due to:
31
Which of the following has maximum inertia?
32
Which physical quantity determines the impact produced by a moving body?
33
A body continues to move uniformly unless:
34
The product of force and time is called:
35
The unit of impulse is:
36
Which law explains why we wear seat belts in cars?
37
A man pushing a wall experiences a reaction force. The wall does not move because:
38
Which of these is not a contact force?
39
When a carpet is beaten, dust particles come out due to:
40
The acceleration produced in a body depends on:
41
A bullet of mass 50 g moving with velocity 100 m/s has momentum:
42
A force of 20 N acts on a mass of 2 kg. The acceleration is:
43
Walking is possible because of:
44
Which law explains rocket propulsion?
45
The rate of change of velocity is called:
46
The inertia of an object depends on:
47
An object at rest can be moved by:
48
When a horse pulls a cart, the cart moves because:
49
Which is an example of conservation of momentum?
50
Which of the following quantities remains constant in an isolated system of colliding bodies?

Frequently Asked Questions

Force is a push or pull on an object that can change its state of motion or shape.

Balanced forces are equal in magnitude and opposite in direction, producing no change in motion.

Unbalanced forces cause a change in the state of motion or shape of an object.

Sir Isaac Newton formulated the three laws of motion.

An object remains at rest or in uniform motion unless acted upon by an unbalanced external force.

Inertia is the tendency of an object to resist any change in its state of motion or rest.

The rate of change of momentum is directly proportional to the applied force and occurs in its direction.

For every action, there is an equal and opposite reaction.

Momentum is the product of an object’s mass and velocity, given byp=m×vp = m \times vp=m×v.

The SI unit of force is the newton (N).

The SI unit of momentum is kg·m/s.

One newton is the force that produces an acceleration of 1 m/s² in an object of mass 1 kg.

F=m×aF = m \times aF=m×a— whereFFFis force,mmmis mass, andaaais acceleration.

Acceleration depends directly on the applied force and inversely on the object’s mass.

Due to inertia, the passenger's body resists the forward motion.

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