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Physics for IGCSE & O level - Forces And Motion (Section 7)

1
What happens to the speed of a motorcycle if the centripetal force increases?
Answer
(A)
It increases.
2
What are the two essential components for defining velocity?
Answer
A
B
3
Which law of motion describes inertia?
Answer
(A)
Newton's First Law
4
Which statement best describes Newton's First Law of Motion?
Answer
(C)
An object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by a force.
5
What does the sign (+ or -) of velocity indicate?
Answer
(B)
The object's direction.
6
What is the action force in the example of walking?
Answer
(A)
The force of the foot on the ground.
7
Centripetal force always points:
Answer
(C)
Towards the center of the circle.
8
If an object is slowing down, what is the sign of its acceleration?
Answer
(B)
Negative
9
What does Newton's second law of motion state?
Answer
(C)
Force is equal to the mass of the object times its acceleration.
10
What does a negative acceleration mean?
Answer
(C)
The object is slowing down
11
In a ticker-tape experiment, what does a small distance between dots indicate?
Answer
(D)
The trolley is stationary.
12
What is the SI unit of momentum?
Answer
(B)
kg m/s
13
What can a ticker tape be used for in the lab?
Answer
A
B
C
14
What happens to an object's motion if the net force acting on it is zero?
Answer
(C)
The object's velocity remains constant.
15
What is the definition of a force?
Answer
(A)
A push or a pull.
16
How can you find the acceleration of a car, given the change in its velocity and the time taken?
Answer
(B)
Divide change in velocity by time.
17
If a car's velocity increases from 0 m/s to 12 m/s in 4 seconds, what is its average acceleration?
Answer
(A)
3 m/s²
18
What happens to the motion of a falling object when it reaches its highest point?
Answer
(A)
It stops momentarily.
19
Which factor most directly affects the amount of gravitational force between two objects?
Answer
(C)
The distance between the objects.
20
What is the action force in the example of a swimmer propelling themselves through the water?
Answer
(C)
The swimmer pushing the water backward.
21
Which of these statements are true about the acceleration of an object?
Answer
B
C
22
What does a straight, horizontal line on a velocity-time graph represent?
Answer
(C)
Zero acceleration
23
Which of the following is a factor that affects friction between two surfaces?
Answer
(C)
The surface materials of the objects.
24
What is the formula for impulse?
Answer
(A)
Force x time
25
What is the formula for calculating speed?
Answer
(B)
Speed = Distance / Time
26
What is the equation for resultant force?
Answer
(A)
Resultant force = mass * acceleration
27
How do jets and rockets produce thrust?
Answer
(A)
By expelling mass backwards.
28
What does a horizontal line on a distance-time graph indicate?
Answer
(C)
The object is at rest
29
What is the definition of average speed?
Answer
(B)
Distance divided by time.
30
Which of the following statements is true regarding constant acceleration?
Answer
A
B
C
D
31
How does an increase in speed affect centripetal force?
Answer
(A)
It increases.
32
In a ticker tape experiment, which motion can be shown from the ticker tape?
Answer
A
B
C
D
33
What will be shown in the case when an object is moving with a constant speed?
Answer
A
B
C
D
34
What is the unit for acceleration?
Answer
(B)
m/s²
35
Which of the following are properties of velocity?
Answer
A
B
36
Which of the following would cause an object to accelerate?
Answer
(C)
An unbalanced force
37
Which of the following are examples of forces in balance?
Answer
A
C
D
38
What is the relationship between the area under a speed-time graph and the distance traveled?
Answer
(B)
The area is equal to the distance.
39
What are the types of forces that can cause acceleration of an object?
Answer
A
C
D
40
What factors must one consider when analyzing a speed-time graph?
Answer
A
B
C
41
If a car travels 100 meters in 4 seconds, what is its average speed?
Answer
(A)
25 m/s
42
What are the units of gravitational field strength?
Answer
(C)
N/kg
43
What is inertia?
Answer
(B)
The resistance of an object to a change in its state of motion.
44
What causes an object to slow down?
Answer
(D)
A force acting in the opposite direction of motion.
45
If the graph shows the ball at its highest point, what is its velocity?
Answer
(C)
0 m/s
46
What happens to air resistance as the speed of an object increases?
Answer
(C)
Air resistance increases.
47
What is the action force when a book sits on a table?
Answer
(D)
The book's force on the table.
48
Which characteristics can be derived from the velocity-time graph?
Answer
A
B
C
D
49
What is the value of the acceleration due to gravity on the earth?
Answer
(B)
9.8 m/s²
50
Which of the following increases air resistance?
Answer
(C)
Increasing the object's surface area.