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Edexcel GCSE Combined Science Physics > Topic 1 & 2 Forces & Motion > Flashcards

Topic 1 & 2 Forces & Motion Flashcards

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1
Q

1 Runner A finishes a race in less time than runner B. Who is faster?

A

runner A

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2
Q

2 What two measurements are needed to calculate a speed?

A

distance and time

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3
Q

3 What is the SI unit for speed?

A

m/s

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4
Q

4 What does acceleration mean?

A

speeding up or slowing down

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5
Q

5 What is a force?

A

push or pull

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6
Q

6 How do we represent forces on diagrams?

A

arrows, with length depending on size of force

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7
Q

7 What does mass mean?

A

amount of substance

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8
Q

8 What is the unit for mass?

A

kilogram

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9
Q

9 What does a vector have that a scalar does not?

A

direction

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10
Q

10 Name a scalar and a vector measured in metres.

A

distance, displacement

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11
Q

11 Name a scalar and a vector measured in metres/second.

A

speed, velocity

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12
Q

12 Name a vector with units of newtons.

A

force or weight

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13
Q

13 Is mass a vector or scalar?

A

scalar

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14
Q

14 Is energy a vector or scalar?

A

scalar

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15
Q

15 What is acceleration?

A

a change in velocity

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16
Q

16 Why is acceleration a vector?

A

it is measuring a change in another vector

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17
Q

17 What is the difference between speed and velocity?

A

velocity has a direction/is a vector

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18
Q

18 What is the equation for calculating speed?

A

speed = distance / time

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19
Q

19 What is the SI unit for speed?

A

metres per second

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20
Q

20 What is average speed?

A

total distance / time for whole journey

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21
Q

21 What is the equation for calculating distance?

A

distance = speed x time

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22
Q

22 How is a constant speed shown on a distance/time graph?

A

straight, sloping line

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23
Q

23 What does a horizontal line on a distance/time graph show?

A

stationary object

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24
Q

24 What is the speed of sound in air?

A

approximately 330m/s

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25
Q

25 How is a stationary object shown on a distance/time graph?

A

horizontal line

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26
Q

26 How can you tell which part of a journey shown on a distance/time graph has the highest speed?

A

steepest line

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27
Q

27 How can you calculate velocity from a distance/time graph?

A

gradient of line

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28
Q

28 What does acceleration mean?

A

change in velocity in time

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29
Q

29 What are the units for acceleration?

A

metres per second squared

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30
Q

30 In the acceleration equation, what does u stand for?

A

initial velocity

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31
Q

31 In the acceleration equation, what does v stand for?

A

final velocity

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32
Q

32 What is the equation for calculating acceleration?

A

change in velocity/time, or

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33
Q

33 What is the acceleration due to gravity?

A

10m/s2 to 1 sig. fig or 9.8m/s2 to 2 sig. fig.

34
Q

34 What is the force that pulls us towards the Earth?

A

gravity

35
Q

35 What is ‘drag’ another name for?

A

air resistance or water resistance

36
Q

36 What are balanced forces?

A

forces of the same size in opposite directions

37
Q

37 What do we call the forwards force produced by an aeroplane’s engine or propeller?

A

thrust

38
Q

38 What word describes both the speed and direction of movement of an object?

A

velocity

39
Q

39 What is the name for a single force on an object with the same effect as all the forces combined?

A

resultant

40
Q

40 How do we describe the forces on an object when the force in one direction is bigger than the force in the other?

A

unbalanced

41
Q

41 Two forces on an object are in the same direction. How do we calculate the resultant force?

A

add

42
Q

42 Two forces on an object are in opposite directions. How do we calculate the resultant force?

A

find the difference between them

43
Q

43 What does the length of a force arrow on a diagram represent?

A

size of force

44
Q

44 An aeroplane has thrust of 2000N and drag of 1800N. What is the resultant?

A

200N forwards

45
Q

45 Air resistance on a cyclist is 20N and friction is 5N. What is the total force trying to slow the cyclist down?

A

25N backwards

46
Q

46 Name a vector quantity that changes as a car drives at constant speed around a roundabout.

A

velocity

47
Q

47 What are unbalanced forces?

A

forces of different sizes in opposite directions

48
Q

48 What is the direction of the resultant force on a car that is speeding up?

A

forwards

49
Q

49 What is the direction of the resultant force on a bicycle that is slowing down?

A

backwards

50
Q

50 How does a sideways resultant force affect the velocity of a moving object?

A

changes its direction

51
Q

51 How can the pilot of an aeroplane make the plane gain speed upwards?

A

increase the lift/upwards force

52
Q

52 How do balanced forces affect the velocity of a moving car?

A

The car continues with the same velocity.

53
Q

53 You pedal harder on a bicycle. What happens?

A

you accelerate/get faster

54
Q

54 H What is the name of the force that makes objects move in a circular path?

A

centripetal

55
Q

55 H What provides the centripetal force for a car going around a roundabout?

A

friction

56
Q

56 H What are the forces on a moon orbiting around a planet?

A

gravity acting towards the planet

57
Q

57 H In which direction does centripetal force act?

A

towards the centre of the circle .

58
Q

58 Why is the force of gravity greater on a lorry than on a car?

A

larger mass

59
Q

59 Why is the resultant force accelerating a car usually less than the force provided by its engine?

A

air resistance and/or friction

60
Q

60 Name one force that usually has to be taken into account when working out the resultant force on a moving object

A

drag or friction

61
Q

61 When will a resultant force act to slow a car down?

A

when backwards forces are greater than forwards ones

62
Q

62 How can friction act to make a car speed up?

A

between tyres and road

63
Q

63 How can friction act to make a car slow down?

A

in brakes

64
Q

64 What is the formula linking force, mass and acceleration?

A

F = m x a

65
Q

65 An object is moving at a constant velocity. What can you say about the forces on it?

A

balanced

66
Q

66 What is the equation relating these factors?

A

speed = distance / time

67
Q

67 What type of force is used to slow down a moving vehicle?

A

friction

68
Q

68 Where is this force applied?

A

brakes, tyres

69
Q

69 Why is a wet road more slippery than a dry one?

A

water acts as lubricant

70
Q

70 An object has a negative acceleration. What does this mean?

A

it is slowing down

71
Q

71 What effect does drinking alcohol have on human reaction times?

A

slows them down/makes them longer

72
Q

72 How will being tired affect reaction time?

A

make it longer

73
Q

73 What does ?braking distance? mean?

A

the distance a car travels while slowing down

74
Q

74 What does ?thinking distance? mean?

A

the distance a car travels while the driver is reacting to a danger and deciding to apply the brakes

75
Q

75 How does speed affect the thinking distance?

A

higher speed, longer thinking distance/thinking distance directly proportional to speed

76
Q

76 How does speed affect the braking distance?

A

higher speed, longer braking distance/braking distance proportional to speed squared

77
Q

77 How does the force needed for an acceleration depend on the size of the acceleration?

A

larger acceleration, larger force needed

78
Q

78 What does deceleration mean?

A

slowing down/a negative acceleration

79
Q

79 H What factors affect the momentum of a moving object?

A

mass, velocity

80
Q

80 H How does the mass affect momentum?

A

higher mass, higher momentum

81
Q

81 H How does the velocity affect momentum?

A

higher velocity, higher momentum

82
Q

<p>82 H What does momentum is conserved mean?</p>

A

<p>total momentum is the same before and after a collision</p>

Edexcel GCSE Combined Science Physics (8 decks)

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