Brainscape's Knowledge GenomeTM

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


See full index

Physics > Forces key questions > Flashcards

Forces key questions Flashcards

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

define resultant force

A

A single force found by adding up all of the individual forces acting on an object

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

typical cycling speed?

A

6 m/s

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

Name five factors that can affect reaction time

A

tiredness, drugs, alcohol, poor visibility, sped

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

Write the equation linking acceleration, change of in velocity and time?

A

acceleration = change in velocity/time

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

define ‘scalar quantity’

A

size but no direction

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

Write the equation linking force, spring constant and extension

A

force = spring constant x extension

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

what is a force?

A

a push or pull

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

4 examples of contact forces

A

friction, air resistance, tension and normal contact force

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

According to Newton’s second law, what is the acceleration of an object inversely proportional to?

A

mass

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

State newton’s second law (rad)

A

The resultant force will cause the object to accelerate in the direction of this force

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

define spring constant

A

the stiffness of the spring

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

is distance scalar or vector?

A

scalar

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

What is the equation linking force, mass and acceleration?

A

force = mass x acceleration

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

What is the law of conservation of the momentum?

A

Total momentum before = total momentum after

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

What happens to an elastic object after the limit of proportionality?

A

Inelastic deformation (It will not return to its original length)

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

when is work done on an object? (dd)

A

When a force moves at a distance in the direction of that force

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

where does the weight of any object act from?

A

the centre of mass

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

According to Newton’s second law, what is the acceleration of an object proportional to?

A

the resultant force

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

3 examples of non contact forces

A

gravitational, electrostatic and magnetic

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

What is the inertial mass of an object?

A

How difficult it is to change the velocity of an object

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

what is the typical reaction time?

A

Between 0.2 and 0.9 s

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

Describe the motion of an object that is initially stationary, when the resultant force is zero

A

remains stationary

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

is velocity scalar or vector?

A

vector

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

What do we call the reluctancy of an object to change motion?

A

inertia

25
Q

define non contact forces

A

forces that can act even when the objects are not touching

26
Q

define weight

A

the force acting on an object due to gravity pulling on its mass

27
Q

is speed scalar or vector?

A

scalar

28
Q

What happens to the temperature of an object when work is done against friction?

A

it increases

29
Q

what is thinking distance?

A

Distance travelled during reaction time

30
Q

How do you calculate the distance travelled from a velocity-time graph?

A

Calculate the area under the curve/line of the selected time

31
Q

What happens to an elastic object up to the limit of proportionality?

A

Elastic deformation (It is able to return to its original length)

32
Q

State newton’s first law (vrf)

A

The velocity of an object will only change if there is a resultant force

33
Q

what is acceleration? (cv)

A

the change in velocity over a given time period

34
Q

typical running speed?

A

3 m/s

35
Q

typical walking speed?

A

1.5 m/s

36
Q

what equipment is used to measure weight (forces)?

A

newtonmeter

37
Q

how do you calculate resultant force? (-+)

A

Subtract forces acting in the opposite direction and add forces acting in the same direction

38
Q

What is the name for the constant speed a falling object reaches when the resistive force is equal to its weight?

A

terminal velocity

39
Q

Write equation linking the momentum, mass and velocity?

A

momentum = mass x velocity

40
Q

what is displacement?

A

a distance with direction

41
Q

How do you calculate acceleration from a velocity-time graph?

A

by calculating the gradient

42
Q

what is stopping distance?

A

Thinking distance + braking distance

43
Q

what equation links weight, mass and gravitational field strength?

A

weight= mass x gravitational field strength

44
Q

When moving in a circle at constant speed, why is velocity constantly changing?

A

direction changes as velocity is a vector quantity

45
Q

Write the equation linking distance, velocity and time

A

distance = speed x time

46
Q

define mass

A

the amount of matter an object contains

47
Q

Write the equation linking work done, force and displacement?

A

work done = force x displacement

48
Q

How many Joules is one Newton-metre?

A

1 joule

49
Q

Name five factors that can affect braking distance

A

Speed, worn tyres, worn brakes, icy roads, damaged roads

50
Q

If an object is falling due to gravity on Earth, what acceleration does it have?

A

9.8 m/s2

51
Q

State the relationship between force and extension for an elastic object

A

they are directly proportional

52
Q

Describe the motion of an object that is initially moving, when the resultant force is zero

A

Continues to move a constant speed in the same direction

53
Q

what is braking distance?

A

Distance travelled once the brakes have been applied

54
Q

State three properties of a pair of forces which obey Newton’s third law

A

The forces are the same type, they act of 2 different bodies and have the same line of action

55
Q

State newton’s third law

A

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

56
Q

define contact forces

A

forces that can only act when objects are touching

57
Q

define ‘ vector quantity’

A

vector quantities have both size and direction

58
Q

How do you calculate the speed of an object from a distance-time graph?

A

by calculating the gradient

59
Q

is displacement scalar or vector?

A

vector

Physics (10 decks)

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