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Physics 3 > Section 1 > Flashcards

Section 1 Flashcards

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1
Q

Speed

A

How fast something is moving

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2
Q

Displacement

A

How far an object has travelled from its starting point in a given direction

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3
Q

Velocity

A

The rate of change of an objects displacement

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4
Q

Acceleration

A

The rate of change of an objects velocity

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5
Q

Working out something falling

Speed and time

A

Speed using v2 = u2 +2as

time using s = ut + 1/2at2

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6
Q

Working out something accelerating steadily

Final speed and distance

A 
v = u + at for final speed
s = 1/2 (u+v) x t
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7
Q

Free fall

A

The motion of an object ungergoing an acceleration of ‘g’

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8
Q

What are the forces acting on an object in free fall?

A

Weight

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9
Q

How to find g

A

measure h
flick switch to start timer and disconnect magnet and release ball which will hit trapdoor and break circuit
use h = 1/2gt^2

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10
Q

Why is vertical speed always the same?

A

Isn’t affected by gravity or any other speed

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11
Q

Vertical component is used to find what?

A

How long in air and how high it goes

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12
Q

Horizontal component to find what?

A

How far

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13
Q

Displacement-time graph

Acceleration is shown how?

A

A curve

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14
Q

Displacement-time graph

High gradient curve

A

Higher acceleration

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15
Q

Displacement-time graph

how to find velocity

A

change in displacement /

change in time

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16
Q

Velocity-time graph

gradient shows what

A

acceleration

17
Q

Velocity-time graph

uniform acceleration

A

straight line

18
Q

Velocity-time graph

y = mx+c

A

u is y intercept

a is gradient

19
Q

Velocity-time graph

Displacement

A

area under graph

20
Q

Velocity-time graph

increasing acceleration

A

increasing gradient

curve

21
Q

Velocity-time graph

decreasing acceleration

A

decreasing gradient

curve

22
Q

Stopping distance equation

A

`thinking distance + braking distance

23
Q

Reaction time

A

Time taken to react and hit the brakes

24
Q

Thinking distance

A

distance the vehicle travels during the drivers reaction time

25
Q

Braking distance

A

distance the vehicle travels after the brakes are applied until it comes to a complete stop

26
Q

thinking distance equation

A

speed x reaction time

27
Q

Reaction time is increased by what?

A 
Tiredness
alcohol 
drugs 
illness
distractions
28
Q

braking distance depends on what

A

braking force
friction between the tyres and the road
mass and speed

29
Q

Braking distance

braking force

A

Braking force is reduced by the reduced friction between the brakes and the wheels

30
Q

Braking distance

friction on roads

A

friction between tyres and road is reduced by wet and ice, dirt and leaves or worn out tyre treads

Physics 3 (5 decks)

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