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Physics Paper 2 > Topic 5 - Forces > Flashcards

Topic 5 - Forces Flashcards

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1
Q

What is the unit of force in the International System of Units (SI)?

A

Newton

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2
Q

What law states that for every action there is an equal and opposite reaction?

A

Newton’s Third Law of Motion

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3
Q

True or False: Weight is the force acting on an object due to gravity.

A

True

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4
Q

What is the formula to calculate weight?

A

Weight = mass × gravitational field strength

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5
Q

Fill in the blank: The __________ of an object is the measure of the amount of matter it contains.

A

mass

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6
Q

What is the effect of a net force of zero on an object’s motion?

A

The object remains at rest or continues to move at a constant velocity.

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7
Q

In which direction does friction act?

A

Opposite to the direction of motion

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8
Q

What type of friction acts when an object is not moving?

A

Static friction

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9
Q

What is the term for the force that opposes the motion of an object through a fluid?

A

Drag

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10
Q

True or False: The greater the surface area of an object, the more drag it experiences.

A

True

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11
Q

What does the term ‘resultant force’ refer to?

A

The single force that has the same effect as all the original forces acting together.

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12
Q

Multiple choice: Which of the following is NOT a type of force? A) Gravitational B) Frictional C) Magnetic D) Thermal

A

D) Thermal

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13
Q

What is the gravitational field strength on Earth approximately?

A

9.81 N/kg

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14
Q

What does Newton’s First Law of Motion state?

A

An object will remain at rest or in uniform motion unless acted upon by a net external force.

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15
Q

Fill in the blank: The __________ of an object is a measure of its resistance to changes in motion.

A

inertia

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16
Q

What is the formula for calculating acceleration?

A

Acceleration = (final velocity - initial velocity) / time

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17
Q

True or False: The mass of an object affects its acceleration when a force is applied.

A

True

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18
Q

What is the relationship between force, mass, and acceleration according to Newton’s Second Law?

A

Force = mass × acceleration

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19
Q

Multiple choice: Which of the following forces is a contact force? A) Gravitational B) Electrostatic C) Friction D) Magnetic

A

C) Friction

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20
Q

What is air resistance?

A

A type of drag force that opposes the motion of an object moving through air.

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21
Q

True or False: An object can have a mass but no weight.

A

False

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22
Q

What is the term for the force exerted by a surface to support the weight of an object resting on it?

A

Normal force

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23
Q

Fill in the blank: The __________ of an object is the force due to gravity acting on it.

A

weight

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24
Q

What happens to the weight of an object as it moves away from the Earth’s surface?

A

It decreases.

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25
What is a free-body diagram?
A graphical representation of the forces acting on an object.
26
Multiple choice: What is the force that pulls objects toward the center of the Earth? A) Friction B) Tension C) Gravity D) Air resistance
C) Gravity
27
What is the term for the maximum speed an object can achieve as it falls through a fluid?
Terminal velocity
28
True or False: An object at terminal velocity experiences zero net force.
True
29
What is the principle of conservation of momentum?
In a closed system, total momentum before an event is equal to total momentum after the event.
30
Fill in the blank: The __________ is a measure of how fast something is moving in a particular direction.
velocity
31
What is the difference between speed and velocity?
Speed is scalar (magnitude only), while velocity is vector (magnitude and direction).
32
What does a steep slope on a distance-time graph represent?
A high speed.
33
Multiple choice: Which of the following is NOT a vector quantity? A) Displacement B) Velocity C) Speed D) Acceleration
C) Speed
34
What is the effect of increasing mass on the acceleration of an object when the same force is applied?
Acceleration decreases.
35
What is inertia?
The tendency of an object to resist changes in its state of motion.
36
True or False: The greater the mass of an object, the greater its inertia.
True
37
What is the definition of a contact force?
A force that acts at the point of contact between two objects.
38
Fill in the blank: The __________ of an object is the distance covered in a particular direction.
displacement
39
What is the formula for calculating momentum?
Momentum = mass × velocity
40
Multiple choice: What is the term for the force that acts to oppose the motion of an object? A) Thrust B) Lift C) Friction D) Gravity
C) Friction
41
What does the term 'net force' refer to?
The total force resulting from the combination of all individual forces acting on an object.
42
True or False: A net force can be calculated by adding all the forces acting in the same direction and subtracting the forces acting in the opposite direction.
True
43
What is the effect of balanced forces on an object?
The object remains in its current state of motion.
44
Fill in the blank: The __________ of an object is the rate of change of its velocity.
acceleration
45
What is the relationship between force and acceleration in terms of mass?
Acceleration is directly proportional to force and inversely proportional to mass.
46
Multiple choice: Which force is responsible for keeping planets in orbit around the sun? A) Friction B) Gravitational C) Magnetic D) Normal
B) Gravitational
47
What is the main factor that affects the magnitude of gravitational force between two objects?
The mass of the objects and the distance between them.
48
True or False: The gravitational force between two objects increases as the distance between them decreases.
True
49
What type of motion does a projectile experience?
A combination of horizontal and vertical motion.
50
Fill in the blank: The __________ force is the force acting on a body in free fall due to gravity.
weight
51
What is the role of air resistance in free fall?
It opposes the weight of the falling object, reducing its acceleration.
52
Multiple choice: Which of the following describes a force that acts at a distance? A) Contact force B) Tension C) Gravitational force D) Friction
C) Gravitational force
53
What is the term for the force that a surface exerts to support the weight of an object resting on it?
Normal force
54
True or False: The normal force acts perpendicular to the surface of contact.
True
55
What happens to the acceleration of an object if the mass is doubled while the force remains constant?
The acceleration is halved.
56
Fill in the blank: The __________ of an object is its speed in a specific direction.
velocity
57
What is the difference between mass and weight?
Mass is the amount of matter in an object, while weight is the force acting on that mass due to gravity.
58
What is the principle of action and reaction?
For every action force, there is an equal and opposite reaction force.
59
Multiple choice: In which scenario would an object experience a net force? A) When all forces are balanced B) When forces are unbalanced C) When at rest D) When moving at constant speed
B) When forces are unbalanced
60
What is the role of tension in a rope?
Tension is the pulling force transmitted through the rope when it is pulled tight.
61
True or False: Tension can only act in one direction.
True
62
What is the formula for calculating the resultant of two forces acting in the same direction?
Resultant = Force 1 + Force 2
63
Fill in the blank: The __________ of an object is a measure of its ability to do work.
energy
64
What is the unit of measurement for work done?
Joule
65
Multiple choice: Which of the following forces can do work? A) Gravitational B) Magnetic C) Friction D) All of the above
D) All of the above
66
What is the relationship between work, force, and distance?
Work = Force × Distance × cos(θ) where θ is the angle between the force and direction of motion.
67
True or False: Work is done when a force causes an object to move.
True
68
What is the definition of a scalar quantity?
A quantity that has only magnitude, not direction.
69
Fill in the blank: The __________ is the amount of force applied over a distance.
work
70
What is the significance of Newton's Second Law in real-world applications?
It helps to predict how objects will move when forces are applied.
71
Multiple choice: Which of the following is a vector quantity? A) Mass B) Speed C) Force D) Temperature
C) Force
72
What is the term for the change in momentum over time?
Impulse
73
True or False: Impulse is equal to the change in momentum.
True
74
What is the formula for impulse?
Impulse = Force × Time
75
What happens to an object's momentum if its mass is doubled?
Momentum is also doubled if velocity remains constant.
76
Multiple choice: Which of the following forces is responsible for circular motion? A) Centripetal B) Gravitational C) Frictional D) All of the above
A) Centripetal
77
What is the definition of centripetal force?
A force that acts on an object moving in a circular path, directed towards the center of the circle.
78
True or False: Centripetal force is a type of frictional force.
False
79
What is the formula for centripetal force?
Centripetal Force = (mass × velocity^2) / radius
80
Fill in the blank: The __________ of an object in circular motion is constant, while its velocity is changing.
speed
81
What does the term 'equilibrium' refer to in physics?
A state in which opposing forces or influences are balanced.
82
Multiple choice: Which condition must be true for an object to be in equilibrium? A) Net force is zero B) Forces are balanced C) Object is at rest D) All of the above
D) All of the above
83
True or False: An object can be in equilibrium while moving at constant speed.
True
84
What happens to the acceleration of an object if the net force acting on it is zero?
The object does not accelerate.

Physics Paper 2 (5 decks)

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