Physics: Motion graphs

Physics

Motion

Motion Graphs

Speed = d/t

Acceleration = v-u/t

Speed

• measured in m/s

• Displacement = distance travelled in a direction

• Velocity = speed in a direction

Acceleration

• measured in m/s2

• Change in speed / time

• V = final velocity

• u = initial velocity

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A sprinter ran 130 metres in 10 seconds. What was his speed?

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A Porsche travelled at 40 m/s for 2 minutes. How far did it go?

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A Ferrari was travelling at 20 m/s behind a lorry. It pulled out to overtake and accelerated at 4 m/s2 for 2 seconds. What was its new speed ?

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Once passed the lorry the Ferrari continued to accelerate.in 10 seconds it had reached a speed of 32m/s. What was the rate rate of acceleration?

Motion represented on graphs

• There are two types of motion graphs, and three types of motion. 

• Distance time - Gradient of graph = velocity

• Velocity time - Gradient = acceleration

• Velocity time - Area = distance travelled

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What was his acceleration from 0 to 15 sec ?

Open Ended

What was happening at 50 seconds?

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Approximately how far did he fall altogether?

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Calculate speed over OA

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Calculate speed over AB

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Calculate speed over BC

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Calculate acceleration over OA

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Calculate acceleration over AB

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Calculate acceleration over BC

Before you work out the total distance travelled, remember....

• area of a square/rectangle = base x height

• area of a triangle = 1/2 x base x height

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Calculate the total distance travelled by the car.