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