forces and motion physics - ks3 lesson 12 - calculating

Lesson 12 - Calculating speed using distance-time graphsPhysics - KS3

Forces and Motion

Mrs Wolstenholme

1

2

Constant speed

Accelerating

At rest

Time

Distance

3

Constant speed

Accelerating

At rest

Time

Distance

4

Constant speed

Accelerating

At rest

Time

Distance

5

A B

C

D

6

AB C

D E

7

AB C

D E

8

Steepest and highest speed

9

Highest speed

Lowest speed

10

Speed = Distance travelled ÷ time

Distance = 30 m

Time = 25 s

Speed = Distance ÷ time

Speed = 30 ÷ 25

Speed = 1.2 m/s

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Distance = 50 - 30 = 20 m

Time = 25 s


Speed = 20÷ 25

Speed = 0.8 m/s

12


Distance = 50 - 30 = 20 m

Time = 25 s


Speed = 20÷ 25

Speed = 0.8 m/s

13


Distance = 50 - 10 = 40 m

14


Distance = 50 - 10 = 40 m

Time = 30 - 10 = 20 s


Speed = 40÷ 20

Speed = 2 m/s

15


Distance = 80 - 20 = 60 m

Time =

5 50

16


Distance = 80 - 20 = 60 m

Time = 50 - 5 = 45 s


5 50

17


Distance = 80 - 20 = 60 m

Time = 50 - 5 = 45 s


Speed = 60÷ 45

Speed = 1.33 m/s 5 50

18


Distance = 50 - 5 = 45 m

Time = 80 - 20 = 60 s


Speed = 45 ÷ 60

Speed = 0.75 m/s

19


Distance = 100 - 25 = 75 m

Time = 50 - 10 = 40 s


Speed = 75 ÷ 40

Speed = 1.875 m/s

20


Distance = 100 - 25 = 75 m

Time = 50 - 10 = 40 s

21


Distance = 100 - 25 = 75 m

Time = 50 - 10 = 40 s


Speed = 75 ÷ 40

Speed = 1.875 m/s

23

Distance = 4 km

Time = 4 min


Speed = 4 ÷ 4

Speed = 1 km/min

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1 km/min 0 km/min

25

1 km/min 0 km/min

Distance = 16 - 4= 12 km

Time = 10 - 6 = 4 min


Speed = 12 ÷ 4

Speed = 3 km/min

3 km/min

27

Total Distance = 1000 m

Time = 20 min


Speed = 1000 ÷ 20

Speed = 50 m/min

28

Total Distance = 600 km

Time = 9 hours


Speed = 600 ÷ 9

Speed = 66.7 km/h

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