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