Physics for IGCSE & O level - Forces And Motion (Section 12)
1
Which of the following is a unit of mass?
отговор
(B)
kg
2
What is the unit for time?
отговор
(A)
seconds
3
Which of the following quantities have direction?
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B
C
4
What is the type of acceleration that happens to a falling ball?
отговор
(B)
Uniform
5
Which of these statements are true regarding velocity?
отговор
A
B
D
6
In the context of the experiment measuring g, what is measured?
отговор
(B)
The time it takes for the ball to fall a certain height.
7
What is an example of a force pair in Newton's Third Law?
отговор
(C)
The force of a bat on a ball and the force of the ball on the bat.
8
What is the standard unit of acceleration?
отговор
(B)
m/s²
9
What is the effect of increasing the surface area of an object on air resistance?
отговор
(C)
Air resistance increases.
10
What happens to a ball's velocity at its highest point during a vertical throw?
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(B)
It is zero.
11
What is the primary factor causing a falling object to accelerate?
отговор
(B)
Gravity.
12
Which of the following statements is true regarding Newton's 3rd law of motion?
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(B)
Forces always act in pairs.
13
In a distance-time graph, which motion is represented by a curved line?
отговор
(B)
Changing speed.
14
In the equation a = (v_f - v_i)/t, what does v_f represent?
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(B)
Final velocity.
15
Which statements are true regarding velocity?
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A
B
D
16
In the case of a skydiver reaching terminal velocity, which forces are balanced?
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A
B
17
Which of the following is/are true about rockets and jets?
отговор
A
B
C
D
18
In a velocity-time graph, what kind of acceleration results in a horizontal line?
отговор
(A)
Zero acceleration
19
Which of the following is a correct unit for impulse?
отговор
(A)
kg m/s
20
In a circular motion, what is the role of the centripetal force?
отговор
(B)
To change the direction of the object.
21
What is the relationship between the direction of the centripetal force and the velocity of an object moving in a circle?
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(C)
The force is perpendicular to the velocity.
22
Which of the following is a correct statement of Newton's second law?
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(C)
Force equals mass times acceleration.
23
What type of quantity is speed?
отговор
(B)
Scalar
24
Which forces act on a swimmer moving at a constant speed in a straight line?
отговор
A
B
C
D
25
What type of graph represents non-uniform acceleration?
отговор
(C)
A curved line on the speed time graph.
26
Which is the quantity defined as 'force x time'?
отговор
(B)
Impulse
27
What is weight?
отговор
(C)
The force of gravity acting on an object.
28
According to Newton's First Law, what is required to change the motion of an object?
отговор
(B)
A force.
29
Which term describes the force that is pulling on a falling object?
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(B)
Weight
30
In the Free Fall section, what is the acceleration called that will happen to all objects?
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(D)
g (acceleration of free fall).
31
Which of the following statements best describes a falling object when it reaches terminal velocity?
отговор
A
C
D
32
What are the conditions for uniform acceleration?
отговор
B
C
D
33
If the ball is thrown up with an initial velocity of +30 m/s and is falling down, what is the ball's velocity in the downward direction after 1 second?
отговор
(A)
-10 m/s
34
What will be the effect of friction on an object?
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(B)
It will slow down the object.
35
What will happen to an object's momentum if it is acted upon by a non-zero net force?
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(D)
The momentum will change.
36
What happens to the centripetal force if the speed of an object moving in a circle is doubled, while the radius and mass stay the same?
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(B)
It quadruples.
37
On a speed-time graph, how does one find the distance traveled?
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(B)
By calculating the area under the graph.
38
In the context of Newton's third law, if a bird flies by pushing air downwards, what is the reaction force?
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(B)
The force of the air pushing the bird upwards.
39
What is the relationship between the gravitational force and the masses of two objects?
отговор
(A)
The gravitational force increases as the masses increase.
40
Which of the following is the characteristic for zero acceleration on the speed-time graph?
отговор
(B)
Horizontal line
41
What is the total momentum of a system, during a collision if it remains in a closed system?
отговор
(C)
Remains constant
42
Which term is used to describe decreasing velocity?
отговор
B
C
43
In a distance-time graph, what does a curved line indicate about the object's speed?
отговор
(C)
Changing speed.
44
If a car travels 100 meters in 5 seconds, what is its average speed?
отговор
(B)
20 m/s
45
What happens to an object when acted upon by an unbalanced force?
отговор
(C)
It accelerates.
46
What is the relationship between weight and mass?
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(B)
Weight is a measure of mass and the gravitational field strength.
47
What information can be obtained from a speed-time graph?
отговор
A
B
C
48
What is the name of the experiment to measure g by the acceleration of free fall?
отговор
(C)
Measuring g
49
If an object has a uniform acceleration, what kind of line does it have on a velocity-time graph?
отговор
(C)
A straight line
50
What does the slope represent in a speed-time graph?
