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Physics > Topic 1 - Motion > Flashcards

Topic 1 - Motion Flashcards

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1
Q

Runner A finishes a race in less time than runner B. Who’s faster?

A

Runner A

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2
Q

What two measurements are needed to calculate speed?

A

Distance and time

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3
Q

What is the SI unit for speed?

A

m/s

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4
Q

What does acceleration mean?

A

A change in velocity

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5
Q

How do we represent forces on diagrams?

A

Arrows, with length depending on size of force

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6
Q

What does mass mean?

A

Amount of matter inside an object

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7
Q

What is the unit for mass?

A

Kg

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8
Q

What does a vector have that a scalar does not?

A

Direction

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9
Q

Name a scalar and a vector measured in metres

A

Distance, displacement

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10
Q

Name a scalar and a vector measured in m/s

A

Speed, velocity

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11
Q

Name a vector with units of newtons

A

Force or weight

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12
Q

Is mass a vector or scalar

A

Scalar

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13
Q

Is energy a vector or scalar

A

Scalar

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14
Q

Why is acceleration a vector?

A

It is measuring a change in another vector

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15
Q

What is the equation for calculating speed?

A

Speed = distance / time

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16
Q

What is the average speed

A

Total distance / time for the whole journey

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17
Q

What is the equation for calculating distance?

A

Distance = speed x time

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18
Q

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

A

Straight, sloping line

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19
Q

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

A

Stationary object

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20
Q

What is the speed of sound in still air?

A

330m/s

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21
Q

How can you calculate velocity from a distance time graph?

A

Gradient of line

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22
Q

Unit for acceleration?

A

m/s/s

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23
Q

What is u?

A

Initial velocity

24
Q

What is v?

A

Final velocity

25
Q

How to calculate acceleration?

A

Velocity / time / time

26
Q

What is the acceleration due to gravity?

A

10 m/s

27
Q

What is the force of gravity?

A

10 newtons

28
Q

What is the force that pulls us to earth?

A

Gravity

29
Q

What is ‘drag’ also called?

A

Air/water resistance

30
Q

What are balanced forces?

A

Equal sized forces acting in opposite directions

31
Q

What do you call the force produced by an engine?

A

Thrust

32
Q

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

A

Velocity

33
Q

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

A

Resultant

34
Q

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

A

Unbalanced

35
Q

How to calculate 2 forces in the same direction?

A

Add

36
Q

Calculate 2 forces in opposite directions

A

Find the range

37
Q

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

A

Size of force

38
Q

Thrust = 2000N
Drag = 1800N
What is the resultant?

A

200N forwards

39
Q

How do balanced forces on an object affect it’s velocity?

A

It’s velocity stays the same

40
Q

What is the name for the force that makes an object move in a circular path?

A

Centripetal

41
Q

What provides the centripetal force for a car going round a roundabout?

A

Friction

42
Q

What are the forces on an orbiting moon?

A

Gravity acting towards the planet

43
Q

In what direction does the centripetal force act?

A

Towards the centre of the circle

44
Q

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

A

Greater mass

45
Q

Why is the resultant force accelerating a car usually less than the force provided by it’s engine?

A

Air resistance/friction

46
Q

Formula for force

A

F = m x a

47
Q

An object is moving at a constant velocity, what can be said about forces acting on it?

A

Balanced

48
Q

Where is friction applied in a car?

A

Brakes/tyres

49
Q

Why is wet road more slippery than a dry one?

A

Water acts as a lubricant

50
Q

Negative deceleration?

A

Slowing down

51
Q

Drinking alcohol effects?

Being tired?

A

Increased reaction time

52
Q

Braking distance?

A

The distance a car travels while slowing down

53
Q

Thinking distance?

A

Distance between driver recognising danger and applying the brakes

54
Q

How speed affects thinking distance

A

Greater speed, greater thinking distance

55
Q

What is the equation for momentum?

A

Mass x velocity

56
Q

What is meant by ‘momentum is conserved’?

A

Total momentum before = total momentum after

Physics (2 decks)

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