Physics for IGCSE & O level - Forces And Motion (Section 2)
1
What happens to the force in space?
2
In a rocket engine, what is expelled to create thrust?
3
What does the area under the acceleration-time graph represent?
4
Which of the following scenarios represents a constant velocity?
Risposta(B)
A skydiver falling at a constant speed.
5
What is the name given to the movement of an object under the sole influence of gravity?
6
In Newton's Third Law, what is the term for the force that is equal in magnitude and opposite in direction to the action force?
7
What is the unit of measurement for momentum?
8
What is the difference between average speed and instantaneous speed?
Risposta(C)
Average speed is the total distance divided by total time; instantaneous is the speed at a single moment.
9
What is the correct expression for Newton's Second Law?
10
What is the relationship between impulse and momentum?
Risposta(A)
Impulse is equal to the change in momentum.
11
What is the relationship between time and distance for an object moving at a constant speed?
12
If the forces acting on an object are balanced, what happens to the object's motion?
Risposta(D)
It maintains a constant velocity.
13
What is the relationship between the change in momentum and impulse?
Risposta(B)
Impulse is the change in momentum.
14
What is the effect of an applied force?
15
What is the displacement of an object that returns to its starting point?
16
What does the term "free fall" exclude?
17
Which of the following is a correct statement of Newton's Second Law?
Risposta(C)
Force = mass x acceleration
18
How does air resistance affect the acceleration of a falling object?
Risposta(B)
Decreases the acceleration
19
If a car is slowing down, which of the following statements is correct?
Risposta(C)
The acceleration is in the opposite direction to the velocity.
20
Which of these statements is TRUE about acceleration due to gravity?
Risposta(C)
It is a constant value near Earth's surface.
21
What is the relationship between the force acting on an object and its acceleration?
Risposta(C)
The acceleration is in the same direction as the force.
22
What does the slope of a distance-time graph represent?
23
What are the two main components of velocity?
24
Which of Newton's laws explains the concept of action and reaction?
25
In a closed system, what happens to the total momentum during a collision?
26
Which statement is true regarding the acceleration of a projectile?
Risposta(B)
It is constant and downwards throughout its motion.
27
Which of the following graphs represents an object at rest?
Risposta(A)
A horizontal line on a distance-time graph.
28
What term is used to describe the slowing down of an object?
29
What provides the centripetal force to keep an object moving in a circle?
30
What is the main reason for a rocket to go upwards?
31
If a car starts from rest and accelerates, which graph would best represent its motion?
Risposta(C)
Curved line on a distance-time graph.
32
Which of the following is a unit for measuring acceleration?
33
When is momentum conserved in a system?
Risposta(C)
When no external forces act on the system.
34
What happens when two trolleys of equal mass collide head-on and stick together?
35
What does the area under a speed-time graph represent?
36
In a rocket, what is the purpose of fuel?
37
What is the meaning of the term "deceleration"?
38
What does a horizontal line on a distance-time graph indicate?
39
What is the effect of the force when the object is moving?
Risposta(C)
The object changes its direction.
40
What must be considered when calculating average speed in the case of non-constant motion?
Risposta(B)
The total distance covered and total time taken
41
Which of the following represents zero acceleration?
Risposta(C)
A horizontal line on a speed-time graph
42
What does a rocket need to perform properly?
43
What is the unit for gravitational field strength?
44
What is gravitational field strength?
Risposta(B)
The acceleration due to gravity.
45
Which force causes a satelite to orbit around earth?
46
Which of the following is an example of a scalar quantity?
47
What causes an object to accelerate?
48
How is the resultant force on an object calculated?
Risposta(B)
Add the forces acting on it.
49
What does the area under a force-time graph represent?
50
What are the characteristics of free fall?
