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