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

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