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Published byClinton Lyons Modified over 4 years ago

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Acceleration When an object is changing its velocity, we say that the object has acceleration Acceleration is how fast velocity is changing To accelerate, one must: –Speed up –Slow down –AND/OR change direction –Can you give an example of each one of these?

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Examples of acceleration Applying the brakes in a car Going around a curve in a car while on cruise control Rolling down a hill Swinging a bucket over your head Hitting a golf ball off a tee

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Average Acceleration Formula Average acceleration = change in velocity time required for change a = v/t = (v f - v i )/t ∆ = change v f = final velocity v i = original (initial) velocity

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Remember- acceleration is the rate at which velocity changes, speed is the rate at which distance changes

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When acceleration is constant… 1.Velocity increases by the same amount over the same time period 2. And, distance covered per second will always increase

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Deceleration is slowing down Zero acceleration is motion at a constant velocity OR not moving at all Can use a v-t graph to show acceleration –+ slope = +acceleration (speed up) –- slope = - acceleration (slow down) –0 slope = no acceleration

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