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Published byTia Frear Modified over 6 years ago

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Acceleration Acceleration Velocity-time graph Questions

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Acceleration Acceleration tells you how quick the velocity of an object is changing, we calculate it using the formula, π΄= πβπ π A β acceleration ( π/π 2 ) V-final velocity(m/s) U-initial velocity (m/s) T- time taken for change (s)

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Acceleration π΄= πβπ π Means: acceleration= πΆβππππ ππ π£ππππππ‘π¦ ππππ

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**Acceleration When an object speeds up it is accelerating**

When an object slows down it is decelerating When an object has a constant velocity it is not accelerating

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Velocity-time graph 40 30 20 10 Velocity(m/s) Time(s) This graph shows us that the car accelerated for 0-40m/s in 10 seconds It also shows us that the car then stayed at velocity of 40m/s for 20 seconds before slowing from 40-0m/s in 20 seconds

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**Velocity-time graph C B D A**

40 30 20 10 C B Velocity(m/s) D A Time(s) We can calculate the acceleration using the gradient of the graph. The acceleration between point A and B is: π΄= πβπ π π΄= 40β0 10 π΄=4 π/π 2

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**Velocity-time graph C B D A**

40 30 20 10 C B Velocity(m/s) D A We can calculate the distance an object has moved by finding the area under the graph, for example, Between point A and B the area under the graph: 40Γ = 200m

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**Question time What is the formula for acceleration? C B**

2) How far did the object move between point B and C? 3) What was the deceleration between point C and D? 40 30 20 10 C B Velocity(m/s) D A Time(s)

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