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Lamda > Physics Best > Flashcards

Physics Best Flashcards

1
Q

What is the difference between speed and velocity

A

Velocity is speed in a given direction

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2
Q

What does the gradient of a distance time graph tell you

A

Speed

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3
Q

What do flat horizontal sections on a distance time graph represent

A

Where it is stationary

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4
Q

What do straight uphill or downhill sections on a distance time graph represent

A

Steady speed

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5
Q

On a distance time graph the steeper the gradient…..

A

The faster the speed

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6
Q

What do curved represent on a distance time graph

A

Acceleration or deceleration

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7
Q

What does a steepening curve represent on a distance time graph

A

Speeding up

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8
Q

What does a levelling off curve represent on a distance time graph

A

Slowing down

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9
Q

What is acceleration

A

How quickly velocity in changing

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10
Q

What can a change in velocity be

A

Change in speed or change in direction

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11
Q

What does the gradient of a velocity time graph represent

A

Acceleration

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12
Q

Why a do flat sections on a velocity time graph represent

A

Steady speed

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13
Q

The steeper the velocity time graph….

A

The greater the acceleration or deceleration

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14
Q

What does the area under a velocity time graph represent

A

The distance traveled in that time interval

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15
Q

What does a curve mean on a velocity time graph

A

Changing acceleration

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16
Q

How is velocity found on a velocity time graph

A

Reading off the velocity axis

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17
Q

What 2 effects does gravity have

A

Makes things accelerate towards the ground, 10m/s2 on earth

Gives everything a weight

18
Q

What is mass

A

The amount of matter in an object

19
Q

What is weight caused by

A

The pull of the gravitational force towards the earth center

20
Q

An object has the …… Mass on earth as on the moon but it’s weight will be …….

A

Same

Different

21
Q

Will a 1kg mass weigh more or less on the moon than on earth?

A

Weigh less (1.6N) on the moon than on earth (10N)

22
Q

Why will a mass weigh less on the moon than on the earth

A

Less of a gravitational force pulling it

23
Q

What is weight measured in

A

Newtons

24
Q

Is weight a force

A

Yes

25
Q

What is weight measured with

A

Newton meter

26
Q

Is mass a force

A

No

27
Q

What is mass measured with and what units

A

Kg with a mass balance

28
Q

What is GFS is on earth

A

10 N/Kg

29
Q

What is GFS on the moon

A

1.6N/Kg

30
Q

What will the overall effect of the forces on an object decide about the motion

A

Where there it will accelerate, decelerate or sty at a steady speed

31
Q

What is the resultant force

A

Single force that has the same effect as all forces acting on the object

32
Q

What direction does gravity act

A

Downwards

33
Q

If there is a resultant force what will happen to the object

A

Change its state of rest or motion; causes a change in velocity

34
Q

What is a reaction force

A

Force opposing gravity so the forces balance, without this force it would accelerate

35
Q

What will happen if the resultant force of an stationary object is 0

A

It will stay stationary

36
Q

If there isn’t a resultant force acting on a moving object what will happen to its motion

A

Keep on moving at the same velocity then all the forces on it must be balanced

37
Q

If there is a non zero resultant force what happens to the motion of the one jet

A

It will accelerate in the direction of the force

38
Q

What 5 forms the acceleration of a non zero resultant force take

A 
Start
Stop
Speed up
Slow down
Change direction
39
Q

Why is ‘if something is moving there must be an overall resultant force acting on it’?

A

If there is an overall resultant force it will accelerate, you get a steady speed if the resultant force is zero

40
Q

When to forces interact what are the forces they exert on each other like

A

Equal and opposite

41
Q

What are speed and velocity both measured in

A

M/s

Lamda (4 decks)

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