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Physics > Motion > Flashcards

Motion Flashcards

1
Q

What is speed defined as

A

The rate of change of speed

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2
Q

How to calculate average speed

A

Distance traveled/time taken

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3
Q

Average speed second equation

A

Initial speed+ final speed/ 2

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4
Q

How to calculate speed

A

Distance over time

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5
Q

If runner went 200m for 25s what is the average speed

A

S= d/t = 200/25=8m/s

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6
Q

How to calculate gradient

A

Rise/run

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7
Q

What does the granite of a distance -time graph equal

A

Speed

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8
Q

How to calculate Rate of change of speed

A

Change in speed/time

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9
Q

If a car is moving at 10m/s and 10s later it’s at 30m/s what is the ROCOS

A

ROCOS = change of speed/time so 30-10/10=20/10=2

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10
Q

If bike is at 15:m/s and then comes to stop 12 secs later what is the ROCOS

A

The retardation is 15/12=1.25

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11
Q

What does the gradient of a speed time graph give us

A

The ROCOS

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12
Q

How to find the distance travelled on a speed time graph

A

Distance travelled equals the area under a speed time graph so lxb

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13
Q

How to find distance traveled on a speed time graph if it’s is a trapezium

A

Total distance= area 1 + area 2 + area 3 remember triangles are 1/2 x l x b

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14
Q

What is a scalar

A

Size and magnitude eg speed distance time ROCOS

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15
Q

What is a vector and some examples

A

These are both direction and magnitude Velocity displacement acceleration and force

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16
Q

If a boy travels 5 metres and then goes back what is its displacement

A

0 as the boy came back to starting point

17
Q

What does the gradient of a displacement time graph give

A

The gradient gives the velocity

18
Q

How to calculate acceleration

A

Change in velocity/time

19
Q

A cyclist is travelling at 8m/s when she applies brakes and brings bicycle to stop in 10s what is average acceleration

A

Acceleration = change in velocity/time = 0-8/10= -8/10= -0.8m/s

20
Q

How do you find displacement on a velocity time graph

A

Areas under a velocity time graph= displacement so l x b

21
Q

How to calculate displacement

A

Displacement= average velocity x time

Physics (4 decks)

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