Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics Exam > P5 > Flashcards

P5 Flashcards

(86 cards)

Start Studying
1
Q

What is a Force?

A

A force is a push or a pull that acts on an object due to the interaction with another object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Force is a vector quantity, meaning it has magnitude

A

and direction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Contact Force:

A

A force that requires two objects to be touching for the force to be applied.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Example of contact force chair

A

When a person sits on a chair, the weight of the person causes a contact force of reaction from the chair.”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Non-Contact Force:

A

A force that acts between two objects that are not touching

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Example of non contact force

A

“The Earth exerts a non-contact gravitational force on the Moon.”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

List of Contact Forces

A

Friction
Air resistance
Tension
Normal contact force
Applied force
Reaction force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Friction

A

Resists motion between two surfaces in contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Air resistance

A

A type of friction acting against objects moving through air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Tension

A

In a stretched string, rope, or cable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Normal contact force

A

The support force from a surface (e.g. floor pushing up on your feet)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Applied force

A

A direct push or pull (e.g. pushing a trolley)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

List Non-Contact Forces –

A

Gravitational force

Electrostatic force

Magnetic force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Gravitational force

A

Attraction between objects with mass (e.g. Earth pulls you down)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Magnetic force

A

Between magnets and magnetic materials (iron, nickel, cobalt)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Electrostatic force

A

Between charged objects (e.g. two negative charges repel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Interaction Pairs (Newton’s Third Law)

A

When two objects interact, they exert equal and opposite forces on each other.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Example of Interaction Pairs (Newton’s Third Law)

A

For example, when you push on a wall, the wall pushes back with an equal force

These forces are

These forces:
• Act on different objects
• Are the same size
• Act in opposite directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Resultant Force

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Example of result in force

A

• If 10 N pulls right and 3 N pulls left, the resultant force is:

10N -3N =7 N

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Explain how a non-contact force acts on a skydiver before they open their parachute.

A

Before the parachute opens, the gravitational force, a non-contact force, pulls the skydiver towards the Earth. This force acts at a distance and does not require the skydiver to touch the Earth. At the same time, air resistance, a contact force, pushes against the motion.”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is a force?

A

A push or pull on an object caused by interacting with another object.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is a contact force?

A

A force that acts only when objects are touching.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the normal contact force?

A

The force a surface exerts to support the weight of an object resting on it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What does Newton’s Third Law say?
When two objects interact, they exert equal and opposite forces on each other.
26
A vector quantity – has
direction and size
27
RESULTANT FORCE
The single force that has the same effect as all the individual forces acting on an object combined.
28
Resultant force
• If forces act in the same direction, add them. • If forces act in opposite directions, subtract the smaller from the larger.
29
HOW TO CALCULATE RESULTANT FORCE
Forces in same direction Add them Example 5 N right + 3 N right = 8 N right Forces in opposite direction Subtract 10 N right – 4 N left = 6 N right
30
Resultant Force on a Stationary Object:
• If resultant force = 0 N, the object is not moving or moving at a steady speed (no acceleration). • If resultant force ≠ 0, the object will accelerate or decelerate.
31
10 N up and 10 N down Resultant Force =
0 N → object is in equilibrium (balanced)
32
WORK DONE
(W = F × d)
33
What is work done
Work is done when a force causes movement in the direction of the force.
34
Work done measured in
• Unit = joule (J) • 1 joule = 1 newton of force moving 1 metre
35
Work Done Equation:
W = F × d
36
• The distance must be in…
the direction of the force
37
A person pushes a trolley with a force of 50 N for a distance of 3 m. Calculate work done
Work done = 50N x 3m =150
38
WORK DONE IS ENERGY TRANSFER
The work done on an object transfers energy to it. For example: Lifting a book = transferring chemical energy → gravitational potential energy Dragging a box = energy transferred to thermal energy (due to friction)
39
Example: Work Against Friction
If you push a box along a rough surface: • You do work against friction • Energy is transferred into heat (thermal energy)
40
What is the resultant force?
The single force that has the same effect as all the forces acting on an object.
41
What happens if the resultant force is zero?
The object stays still or moves at a constant speed.
42
What is the unit of force?
Newtons (N)
43
Can work be done without movement?
No – the object must move in the direction of the force.
44
What is Distance
Distance is how far an object has moved.
45
Scalar quantity → it only has
magnitude (size), not direction
46
Example of distance
If you walk 3 m forward and then 3 m back, the total distance = 6 m
47
Displacement
Displacement is the straight-line distance between the start and end point, including direction.
48
Is displacement a vector quantity
Yes It is a vector quantity (has size and direction)
49
a vector quantity can be …
• Can be positive, negative or zero
50
Example displacement
Walk 3 m forward, then 3 m back. Displacement = 0 m, because you’re back where you started.
51
Is distance and scalar or a vector
Scalar have no direction only magnitude
52
Speed
Speed is how fast something moves with no regard for direction. • It is a scalar quantity • Measured in metres per second (m/s)
53
S= …
Distance divided by time
54
Velocity
Velocity is speed in a given direction. • It is a vector quantity • Can be positive or negative, depending on direction • Also measured in m/s
55
Velocity calculate =
Displacement divided by time
56
A person walks 5 m north and 5 m south in 10 s. What is their displacement?
Displacement = 0 m (they returned to starting point) Speed = 10 ÷ 10 = 1 m/s Velocity = 0 ÷ 10 = 0 m/s
57
Explain the difference between speed and velocity.
Speed is a scalar quantity and only shows how fast something moves. Velocity is a vector quantity and includes both speed and direction.
58
What is speed calculation?
Distance divided by time, scalar quantity.
59
WHAT IS ACCELERATION?
Acceleration is the rate of change of velocity over time.
60
What dose acceleration tells us
how quickly something is speeding up, slowing down, or changing direction.
61
What quantity is acceleration
It’s a vector quantity (has magnitude and direction)
62
ACCELERATION EQUATION
• a = acceleration (m/s²) • v = final velocity (m/s) • u = initial velocity (m/s) • t = time taken (s)
63
Negative Acceleration = Deceleration
If the object is slowing down, the acceleration is negative.
64
Example 1 A car increases its speed from 10 m/s to 30 m/s in 5 seconds. What is the acceleration
65
Acceleration equations
66
Example 2 (acceleration ) A cyclist slows down from 12 m/s to 4 m/s in 4 seconds. What is the acceleration?
67
If it slows down, acceleration is negative (called
deceleration)
68
Acceleration equations
69
Constant speed =
0 acceleration
70
What is acceleration?
The rate of change of velocity per second.
71
Is acceleration a scalar or vector?
Vector – it includes direction
72
NEWTON’S FIRST LAW – “THE LAW OF INERTIA”
An object will remain at rest or at constant velocity unless acted upon by a resultant force
73
• A moving object keeps moving at
constant velocity
74
an object changes speed or direction, there must…
Be a resultant force acting on it.
75
Inertia =…
The tendency of objects to keep doing what they’re doing (stay still or keep moving)
76
1️⃣ A ball is rolling across a smooth surface and doesn’t speed up or slow down →==
No resultant force
77
A parked car stays still →==
No resultant force
78
A car speeds up → ==
There is a resultant force in the direction of motion
79
NEWTON’S SECOND LAW – “FORCE = MASS × ACCELERATION”
The acceleration of an object is directly proportional to the resultant force and inversely proportional to its mass.
80
Formula newton second law
• F = force (Newtons, N) • m = mass (kilograms, kg) • a = acceleration (metres per second squared, m/s²)
81
If there is no force, there
s no acceleration
82
An object has mass 2 kg and accelerates at 3 m/s². What is the force?
83
What does Newton’s First Law state?
An object stays at rest or in constant motion unless acted on by a resultant force.
84
What is inertia?
The tendency of objects to resist changes in their motion.
85
More mass, same force. What happens to acceleration?
Acceleration gets smaller
86
A car is moving with a constant speed. What is the resultant force
Zero

Physics Exam (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions