Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Physics > Topic 5 core questions - Forces > Flashcards

Topic 5 core questions - Forces Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

A value with magnitude only is a ________?

A

scalar

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

A value with magnitude and direction is a ____________?

A

vector

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

Distance and speed are examples of _________ quantities

A

scalar

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

Force, displacement and velocity are examples of __________ quantities

A

vector

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

What is a contact force?

A

A force between two object which are touching

e.g. friction, air resistance

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

What is a non-contact force?

A

A force between objects which are separated by space.

e.g. gravitational, electrostatic, magnetic

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

Define weight

A

The force of gravity acting on an object’s mass

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

What device is used to measure weight?

A

A newtonmeter

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

What is the name of the single point at which an object’s mass appears to act?

A

centre of mass

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

The center of mas of an object is…

A

the single point at which the objects weight appears to act.

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

The single force which has the same effect as the combination of all the different forces acting on an object is the ______________ _______________.

A

resultant force

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

Work is done when an object is ….

A

… moved through a distance

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

Moving objects with mass are said to have __________?

A

momentum

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

State the law of conservation of momentum

A

In a closed system the total momentum before an event is equal to the total momentum after an event.

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

State the equation for weight

A

Weight(N) = Mass(kg) x Gravitational field strength(N/kg)

W=mg

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

State the equation for work done

A

Work done(J) = Force(N) x Distance(m)

W=Fs

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

State the equation for force

A

Force(N) = Spring constant(N/m) x Extension(m)

F=ke

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

State the equation for distance

A

Distance(m) = Speed(m/s) x Time(s)

s=vt

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

State the equation for acceleration

A

Acceleration(m/s²) = Change in velocity(m/s) / Time(s)

a=Δv/t

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

State the equation for resultant force

A

Resultant force(N) = Mass(kg) x Acceleration(m/s²)

F = ma

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

State the equation which links mass, momentum and velocity

A

Momentum(kg m/s) = Mass(kg) x Velocity(m/s)

ρ = mv

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

What is the unit of weight?

A

Newtons (N)

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

What is the unit of mass?

A

kilograms (kg)

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

What is unit of gravitational field strength?

A

newtons per kilogram (N/kg)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the unit of work done?

A

Joules (J)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is the unit of force?

A

Newtons (N)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What is the unit of distance?

A

meters (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What is the unit of the spring constant?

A

Newtons per meter (N/m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is the unit of the spring extension?

A

Metres (m)

30
Q

What is the unit of speed or velocity?

A

metres per second (m/s)

31
Q

What are the units of acceleration?

A

metres per second squared (m/s²)

32
Q

What are the units of momentum?

A

kilogram metres per second (kg m/s)

33
Q

When a spring is stretched and can then return to its original length it is known as __________ _______________

A

elastic deformation or elastic behaviour

34
Q

When a spring is stretched and its length is permanently altered it is known as ___________ ____________

A

Inelastic deformation or inelastic behaviour

35
Q

The limit of proportionallity of a spring is…

A

the length a spring can be stretched to before it no longer returns to its original length

36
Q

The stopping distance of a vehicle is the sum of the …..

A

thinking and breaking distances

37
Q

The distance a vehicle travels while the driver is reacting is the …

A

thinking distance

38
Q

The distance a vehicle travels which the driver is breaking is the …

A

breaking distance

39
Q

Reaction time is…

A

the time it takes a driver to react

40
Q

Factors which influence reaction time are…

A

tiredness, drug, alcohol, distractions

41
Q

Fctors which affect breaking distance are …

A

weather conditions, conditions of breaks and tyres

42
Q

Both thinking and breaking distance are affected by which factor?

A

speed of vehicle

43
Q

The greater the speed of a vehicle, the _________ the force required to stop the vehicle

A

greater

44
Q

The distance and object moves and the direction in which it moves is known as the _________

A

displacement

45
Q

The speed of an object in a particular derection is its ___________

A

velocity

46
Q

The change of an objects speed in a given time is the _________

A

acceleration

47
Q

Acceleration of falling objects close to the earth is ________

A

9.8 m/s²

48
Q

When the force moving an object is balanced by frictional forces it is moving at its _____________ _____________

A

terminal velocity

49
Q

On a distance time graph a straight line represents…

A

constant speed

50
Q

On a distance time graph a upward curve represents…

A

acceleration

51
Q

On a distance time graph a curved line becoming horizontal represents…

A

decelleration

52
Q

On a distance time graph a horizontal line represents…

A

stationary

53
Q

On a distance time graph the gradient is used to calculate the …

A

speed or velocity

54
Q

On a velocity time graph an upwards straight line represents …

A

acceleration

55
Q

On a velocity time graph a downwards straight line represents …

A

decelleration

56
Q

On a velocity time graph a horizontal line represents …

A

constant speed

57
Q

On a velocity time graph a horizontal line along the x-axis represents…

A

stationary object

58
Q

On a velocity time graph, when the line falls below the x-axis it indicates that the object is …

A

moving backwards

59
Q

Calcuating the gradient of a velocity time graph gives the …

A

acceleration

60
Q

Calculating the area under a velocity time graph gives the …

A

distance travelled

61
Q

A typical walking speed is …

A

1.5 m/s

62
Q

A typical running speed is …

A

3 m/s

63
Q

A typical cycling speed is …

A

6 m/s

64
Q

Sound in air travels at …

A

330 m/s

65
Q

State Newton’s First Law

A

The velocity of an object will only change if a resultant force is acting on the object.

66
Q

If balanced forces act on a moving object it will …

A

continue to travel at a constant speed

67
Q

If balanced forces act on a stationary object it will …

A

remain stationary

68
Q

State Newton’s Second Law

A

Force = mass x acceleration (The acceleration of an object is proportional to the resultant force acting on the object, and inversley proportional to the mass of the object)

69
Q

State Newton’s Third Law

A

Whenever two objects interact, the forces they exert on each other are equal and opposite

70
Q

The tendency of objects to continue in their state of rest or of uniform motion is known as …

A

inertia

Physics (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions