1. Motion

2. Menu Stopping Distances Speed Velocity Distance – Time Graphs
Acceleration
Velocity – Time Graphs

3. Stopping distance of vehicles is affected by….
The Thinking Distance
And the…
Braking
Distance

4. What affects the ‘Thinking Distance?
Too much Alcohol
Tiredness
Thinking Distance
Poor Visibility
Drugs

5. What affects the ‘Braking Distance?
Icy Roads
Wet Roads
Braking
Distance
Driving Too Fast
Brakes/
Tyres Worn

6. Identify whether the ‘Thinking distance’ or ‘Braking distance’ is affected in each case

7. Stopping Distances Increase alarmingly with extra speed (because velocity is squared!)
Kinetic Energy Transferred = Work Done by Brakes
½ mv = f x d
v = speed of car
f = maximum braking force
d = braking distance
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8. Speed Speed is how fast you are going with NO Regard to Direction d
Distance (m)
Speed (m/s)=
Time (s) d
The units of speed are m/s
s x t

9. You can measure your own speed…..
Time how long it takes you to run/ walk a set distance
record your results in a table and
use the equation to calculate your speed
Speed = distance/ time

10. Calculate the speed of this runner
He has run 100m in 10 seconds
Distance
Speed =
Time
= 100/ 10
= 10 m/s

11. Calculate the speed of this car
It has travelled 6000 metres in 15 minutes
Don’t forget to write out your equation, show your workings, convert minutes to seconds and include units!

12. Calculate the distance this cyclist (Lance Armstrong) has covered
He has cycled at 15 m/s for 3 hours
Remember time must be in seconds! (Convert hours to seconds)
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13. Velocity Velocity is how fast you are going (with Regard to Direction)
Distance (m)
Velocity (m/s) =
Time (s) d
The units of Velocity are m/s
v x t
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14. Distance-time graphs 40 30 At Rest 20 10 10 20 30 40 50 Return to Menu
Decelerating
(In Opposite
Direction)
Decelerating 40 30 20 10
At Rest
Steady
Speed
Steady Speed
(In Opposite
Direction)
Distance (m)
Accelerating
Time (s)
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15. Questions Distance Time Graphs80 60 40 20
Questions Distance Time Graphs
Distance
(metres)
Time/s
What is the speed of the dog during the first 20 seconds?
How far is the dog from the start after 60 seconds?
What is the speed of the dog during the last 40 seconds?
When was the dog travelling the fastest?
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16. Acceleration
Acceleration is how fast you are speeding up (or how quickly your velocity is changing)
Change in Velocity (m/s)
Acceleration (m/s2) =
Time (s) V
The units of acceleration are
a x t
(m/s2)

17. Acceleration = change in velocity
Example:-This footballer is about to accelerate! Calculate his acceleration
He is initially at rest and within 3 seconds he has reached a velocity of 9m/s
Acceleration = change in velocity
time
= (9m/s – 0m/s) 3s
= 3 m/s2

18. This skier accelerates from 0 to 10m/s in 5 seconds
This skier accelerates from 0 to 10m/s in 5 seconds. What is her acceleration?

19. This motor bike accelerates from 10 to 20m/s with an acceleration of 2m/s2. How long did this take?

20. A rocket accelerates from rest to 5,000m/s in 2 seconds
A rocket accelerates from rest to 5,000m/s in 2 seconds. What is its acceleration?
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21. Calculate the acceleration of this bullet
The bullet was initially at rest and reached a velocity of 300m/s in just 0.2 seconds

22. Velocity - time graphs 40 30 20 10 10 20 30 40 50 Steady Speed
Steady
Speed
Increasing
Acceleration
Steady
Speed
Deceleration
Velocity (m/s)
Acceleration
Time (s)

23. Questions velocity Time graphs
120 90 60 30
Questions velocity Time graphs
Velocity
m/s
Time (s)
How fast was the motor bike going after 10 seconds?
What is the acceleration from 20 to 30 seconds?
What was the deceleration from 30 to 50s?
How far did the motor bike travel in total?

24. Velocity - time graph for terminal velocity
Velocity m/s
Parachute
has opened
Terminal
Velocity
Hits the
ground
New terminal
velocity reached
Time s

25. Velocity - time graph for a parachutist on the moon (Remember No air!)
There is NO terminal velocity
The parachutist is experiencing less gravitational force & does not accelerate as fast
Velocity m/s
Hits the
ground
(HARD!)
Parachute
has opened
Time s
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