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