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Physics for IGCSE & O level - Forces And Motion (Section 8)

1
What does the term 'dynamic friction' refer to?
Answer
(C)
Friction that occurs when an object is in motion.
2
What direction do the forces act, according to Newton's third law?
Answer
(B)
In opposite directions on different objects
3
Which of the following relates to work done on an object?
Answer
(B)
When the object moves in the same direction as the force.
4
What happens to an object's acceleration if the net force acting on it doubles?
Answer
(B)
The acceleration doubles.
5
If an object has constant speed, what is the acceleration?
Answer
(A)
Zero
6
What happens to the air resistance as the speed of a skydiver increases?
Answer
(C)
Air resistance increases.
7
What is the relationship between force, mass, and acceleration?
Answer
(B)
Force = Mass * Acceleration
8
If a car is traveling at 15 m/s for 10 seconds, what distance does it cover?
Answer
(B)
150 m
9
What does the slope represent in a distance-time graph?
Answer
(A)
Speed
10
What does the text say about using the gradient in a distance-time graph?
Answer
(C)
It tells you how much extra distance is covered in a period of time
11
When air resistance equals the force of gravity on a falling object, what is the resulting velocity?
Answer
(C)
Constant
12
What is the relationship between force and acceleration?
Answer
(C)
Force causes acceleration.
13
Which factor(s) influence the magnitude of centripetal force?
Answer
A
B
C
14
Which of the following is the formula for Newton's Second Law of Motion?
Answer
(B)
F = ma
15
Which term is best described as the opposition to the motion of the object?
Answer
(D)
Friction
16
What happens to the momentum of a system when there are no external forces acting upon it?
Answer
(D)
It remains constant.
17
In a speed time graph, what does a straight line parallel to the time axis indicate?
Answer
(C)
Object is moving at a constant speed.
18
If the net force on an object is zero, what will be its state of motion?
Answer
(C)
It will move at a constant velocity or remain at rest.
19
What is the effect of doubling the velocity of an object on its kinetic energy?
Answer
(B)
It quadruples.
20
What does a curved line in a speed-time graph indicate?
Answer
(C)
Non-uniform acceleration.
21
What is Newton's third law of motion?
Answer
(A)
For every action, there is an equal and opposite reaction.
22
What happens to the weight of an object if you move it to a location with a lower gravitational field strength?
Answer
(C)
The weight decreases.
23
What is an example of a situation where friction is desirable?
Answer
(C)
Walking on a sidewalk.
24
What is the relationship between force and acceleration?
Answer
(B)
Force causes acceleration.
25
What happens to the acceleration of an object if you double the net force acting on it, assuming the mass remains constant?
Answer
(C)
The acceleration doubles.
26
Which of the following is the SI unit for acceleration?
Answer
(A)
m/s²
27
Which quantities are considered as scalars?
Answer
(A)
Distance and time
28
What does a decreasing velocity mean?
Answer
(B)
The object's speed is decreasing.
29
What is the formula for calculating weight?
Answer
(B)
Weight = mass * acceleration
30
Which of the following statements is true about weight?
Answer
(B)
Weight is the force of gravity acting on an object.
31
What is the reaction force if an athlete pushes off the ground to jump?
Answer
(B)
The ground pushing the athlete upwards.
32
What is the relationship between mass and inertia?
Answer
(D)
Mass is a measure of inertia.
33
On a speed-time graph, a line with a negative slope indicates what?
Answer
(C)
Negative acceleration (deceleration).
34
If a car's average speed is 30 m/s, how far does it travel in 2 minutes (120 seconds)?
Answer
(C)
3600 m
35
What is the formula for acceleration?
Answer
(B)
a = (v_f - v_i) / t
36
What is the acceleration of a free-falling object near the Earth's surface?
Answer
(A)
9.8 m/s²
37
What is the action force when a person pushes a box across the floor?
Answer
(C)
The force of the person on the box.
38
Which of the following is a unit of impulse?
Answer
(B)
kg m/s
39
If the radius of a circle is doubled, while keeping the speed and mass constant, how does the centripetal force change?
Answer
(B)
It halves.
40
What do we call the movement along a straight line?
Answer
(C)
Linear motion.
41
Which of these statements are true about force?
Answer
A
B
C
42
If you push a box with a force of 10 N, and friction exerts a force of 3 N, what is the net force on the box?
Answer
(B)
7 N
43
If the forces on an object are unbalanced, the object will:
Answer
(B)
Accelerate.
44
In the experiment to measure 'g' on the moon, what factors are involved?
Answer
A
B
45
What is dynamic friction?
Answer
(B)
Friction between surfaces in motion.
46
What can you determine from a speed-time graph?
Answer
A
B
C
47
Which are correct statements about the distance-time graph?
Answer
B
C
48
Which of the following are examples of forces?
Answer
A
C
49
What is the relationship between the centripetal force and the mass of an object moving in a circle?
Answer
(D)
The centripetal force increases as the mass increases.
50
What happens to an object's kinetic energy when it accelerates?
Answer
(B)
It increases.