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Physics for IGCSE & O level - Forces And Motion (Section 10)

1
What happens to an object's acceleration when it is moving with a constant speed in a circle?
Answer
(B)
It is constant in magnitude but changes direction.
2
Which of the following is the effect of friction?
Answer
A
C
3
What is acceleration?
Answer
(C)
The change in velocity over time.
4
Momentum is calculated as the product of:
Answer
(B)
Mass and velocity
5
In the example of a car increasing its velocity, how much is gained every second?
Answer
(A)
3 m/s
6
What does the slope of a distance-time graph represent?
Answer
(B)
Speed
7
A small rocket expels 2kg of exhaust gas every second at a speed of 100 m/s. What is the thrust produced by the engine?
Answer
(C)
200 N
8
If two objects of different masses have the same kinetic energy, which one will have a greater momentum?
Answer
(A)
The object with the larger mass.
9
What causes terminal velocity to be reached for a skydiver?
Answer
(C)
The air resistance is equal to the force of gravity.
10
What causes an object to fall at terminal velocity?
Answer
(B)
Air resistance equals the object's weight.
11
Which of the following can cause a change in an object's motion?
Answer
A
C
12
If the forces acting on an object are balanced, what is the object's motion?
Answer
(B)
The object remains at rest or moves at a constant velocity.
13
If an object has zero speed, what can be said about its motion?
Answer
(B)
It is at rest.
14
What happens to an object's motion if the net force acting on it is zero?
Answer
(C)
The object's velocity is constant.
15
What forces act on an object moving at terminal velocity?
Answer
A
B
16
When an object is moving with constant speed, what is the acceleration?
Answer
(C)
Zero
17
In a ticker-tape experiment, what type of velocity does each dot represent?
Answer
(A)
Instantaneous.
18
If an object is accelerating, what can you conclude about the forces acting on it?
Answer
(C)
The forces are unbalanced.
19
In the example of the car, how much velocity does the car gain every second?
Answer
(C)
3 m/s
20
What provides the centripetal force for a satellite orbiting the Earth?
Answer
(B)
The Earth's gravitational pull
21
What happens to the magnitude of the centripetal force if the radius of the circular path is halved, assuming constant speed and mass?
Answer
(A)
It doubles.
22
Which are the correct units of measurement for speed?
Answer
A
B
C
23
What is the relationship between force and mass, according to Newton's Second Law?
Answer
(C)
Force is directly proportional to mass.
24
Which force always acts downwards towards the center of the Earth?
Answer
(B)
Gravity
25
What is the definition of deceleration?
Answer
(C)
Negative acceleration (slowing down).
26
If the distance between dots increases on the ticker tape, what can you conclude?
Answer
(C)
Positive acceleration
27
Which of the following statements is true?
Answer
(C)
Acceleration is the rate of change of velocity.
28
What is another name for the force of gravity acting on an object?
Answer
(C)
Weight
29
If an object has zero net force acting on it, what will happen to its motion?
Answer
(A)
It will stop accelerating.
30
What is the relationship between the force applied and the acceleration of an object according to Newton's second law?
Answer
(B)
Force and acceleration are directly proportional.
31
What is the relationship between momentum and the law of conservation of momentum?
Answer
(B)
Momentum is only conserved in the absence of external forces.
32
Which statement is true for a moving object in a circle?
Answer
(D)
The object is constantly changing direction, therefore accelerating.
33
What type of motion is represented by a straight line on the velocity-time graph?
Answer
(B)
Constant acceleration.
34
Which of the following best describes the meaning of 'retardation'?
Answer
(B)
Decreasing speed
35
What does the slope of a speed-time graph represent?
Answer
(B)
Acceleration
36
If the mass of an object doubles, what happens to its weight?
Answer
(B)
Weight doubles.
37
What is the formula for calculating acceleration?
Answer
(C)
Acceleration = change in velocity / time taken
38
What factors affect centripetal force?
Answer
A
B
C
39
If two objects have the same momentum, what must be true?
Answer
(D)
Mass and velocity can vary as long as their product remains the same.
40
If an object’s speed changes from 2 m/s to 8 m/s in 3 seconds, what is the acceleration?
Answer
(B)
3 m/s²
41
What does it mean if the ticker tape dots are evenly spaced?
Answer
(A)
Constant velocity.
42
If a ball is thrown straight up, what happens to its speed?
Answer
(B)
Decreases.
43
What can be found by calculating the average distance between dots on a ticker tape?
Answer
(D)
The average speed.
44
What is the relationship between mass and inertia?
Answer
(D)
Mass is a measure of inertia.
45
On a speed-time graph, what does the area under the graph represent?
Answer
(B)
Distance traveled
46
Which factors affect air resistance?
Answer
A
C
47
Which of the following situations describe balanced forces?
Answer
A
C
48
If a car accelerates from 0 m/s to 20 m/s in 5 seconds, what is its acceleration?
Answer
(A)
4 m/s²
49
What is the main cause of air resistance?
Answer
(B)
The friction between the object and the air molecules.
50
If you increase the net force acting on an object, what will happen to its acceleration?
Answer
(B)
The acceleration will increase.