Physics for IGCSE & O level - Forces And Motion (Section 12)
1
Which of the following is a unit of mass?
پاسخ دهید
(B)
kg
2
What is the unit for time?
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(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?
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(B)
Uniform
5
Which of these statements are true regarding velocity?
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A
B
D
6
In the context of the experiment measuring g, what is measured?
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(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?
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(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?
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(B)
m/s²
9
What is the effect of increasing the surface area of an object on air resistance?
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(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?
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(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?
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(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?
پاسخ دهید
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?
پاسخ دهید
A
B
C
D
18
In a velocity-time graph, what kind of acceleration results in a horizontal line?
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(A)
Zero acceleration
19
Which of the following is a correct unit for impulse?
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(A)
kg m/s
20
In a circular motion, what is the role of the centripetal force?
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(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?
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(B)
Scalar
24
Which forces act on a swimmer moving at a constant speed in a straight line?
پاسخ دهید
A
B
C
D
25
What type of graph represents non-uniform acceleration?
پاسخ دهید
(C)
A curved line on the speed time graph.
26
Which is the quantity defined as 'force x time'?
پاسخ دهید
(B)
Impulse
27
What is weight?
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(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?
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(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?
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A
C
D
32
What are the conditions for uniform acceleration?
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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?
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(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?
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(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?
پاسخ دهید
(B)
Horizontal line
41
What is the total momentum of a system, during a collision if it remains in a closed system?
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(C)
Remains constant
42
Which term is used to describe decreasing velocity?
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B
C
43
In a distance-time graph, what does a curved line indicate about the object's speed?
پاسخ دهید
(C)
Changing speed.
44
If a car travels 100 meters in 5 seconds, what is its average speed?
پاسخ دهید
(B)
20 m/s
45
What happens to an object when acted upon by an unbalanced force?
پاسخ دهید
(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?
پاسخ دهید
A
B
C
48
What is the name of the experiment to measure g by the acceleration of free fall?
پاسخ دهید
(C)
Measuring g
49
If an object has a uniform acceleration, what kind of line does it have on a velocity-time graph?
پاسخ دهید
(C)
A straight line
50
What does the slope represent in a speed-time graph?
