Physics for IGCSE & O level - Forces And Motion (Section 13)
1
What is the unit for weight?
Answer
(B)
Newton (N)
2
What is friction?
Answer
(B)
The force that opposes motion between surfaces.
3
What is meant by 'uniform acceleration'?
Answer
(B)
Acceleration is constant.
4
Which of the following quantities has both magnitude and direction?
Answer
(D)
Velocity
5
Which of the following is a form of dynamic friction?
Answer
(D)
Sliding friction
6
What is the relationship between force and momentum?
Answer
(A)
Force is the rate of change of momentum.
7
If an object is moving at a constant velocity, what can you say about the forces acting on it?
Answer
(C)
The net force acting on the object is zero.
8
What can you say about the relationship between mass and acceleration, assuming a constant force?
Answer
(B)
Mass and acceleration are inversely proportional.
9
What does the area of the shaded triangle in the speed-time graph represent?
Answer
(D)
Distance
10
What is the net force acting on an object moving at a constant velocity?
Answer
(A)
Zero
11
What is the relationship between velocity and acceleration?
Answer
(B)
Acceleration is the rate of change of velocity.
12
What is the key idea behind the law of conservation of momentum?
Answer
(D)
Total momentum in a closed system remains constant.
13
The term "impulse" is best described as:
Answer
(A)
The change in momentum.
14
Which of the following is a correct unit for measuring force?
Answer
(C)
N
15
In the example of rocket propulsion, what is the action force?
Answer
(B)
The hot gases expelled downwards.
16
What is the defining characteristic of a closed system in physics, related to momentum?
Answer
(A)
No external forces.
17
What direction is acceleration in a circular motion?
Answer
(C)
Towards the center of the circle.
18
Which is a valid way to describe the motion of an object with uniform speed?
Answer
(C)
A straight, non-horizontal line on the distance-time graph.
19
Which of the following best describes Newton's First Law of Motion?
Answer
(B)
An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
20
In Newton's third law of motion, for every action there is an equal and opposite:
