Distance, Speed and Time

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Presentation transcript:

Distance, Speed and Time Speed = distance (in metres) time (in seconds) Dave walks 200 metres in 40 seconds. What is his speed? Laura covers 2km in 1,000 seconds. What is her speed? How long would it take to run 100 metres if you run at 10m/s? Steve travels at 50m/s for 20s. How far does he go? Susan drives her car at 85mph (about 40m/s). How long does it take her to drive 20km?

Distance-time graphs 2) Horizontal line = 40 30 20 10 4) Diagonal line downwards = Distance (metres) 3) Steeper diagonal line = Time/s Diagonal line = 20 40 60 80 100

40 30 20 10 20 40 60 80 100 Distance (metres) Time/s Distance (metres) Time/s 20 40 60 80 100 What is the speed during the first 20 seconds? How far is the object from the start after 60 seconds? What is the speed during the last 40 seconds? When was the object travelling the fastest?

Speed vs. Velocity Speed is simply how fast you are travelling… This car is travelling at a speed of 20m/s Velocity is “speed in a given direction”… This car is travelling at a velocity of 20m/s east

Acceleration V-U T A Acceleration = change in velocity (in m/s) (in m/s2) time taken (in s) A cyclist accelerates from 0 to 10m/s in 5 seconds. What is her acceleration? A ball is dropped and accelerates downwards at a rate of 10m/s2 for 12 seconds. How much will the ball’s velocity increase by? A car accelerates from 10 to 20m/s with an acceleration of 2m/s2. How long did this take? A rocket accelerates from 1,000m/s to 5,000m/s in 2 seconds. What is its acceleration?

Velocity-time graphs 1) Upwards line = 80 60 40 20 4) Downward line = 4) Downward line = Velocity m/s 3) Upwards line = 2) Horizontal line = T/s 10 20 30 40 50

80 60 40 20 Velocity m/s T/s 10 20 30 40 50 How fast was the object 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 object travel altogether?