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Published byConstance Short Modified over 5 years ago

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s = ut + 1/2at 2 u and a are positive s t

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v = u + at u is positive and a is negative v t

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v 2 = u 2 + 2as u is positive and a is negative v s

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a-t graph for motion with uniform velocity a t

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Vertical motion under gravity

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Motion of a free falling object

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Slope of v-t graph = acceleration => g = (2.75-0.5)/(3*0.08) = 9.375 ms -2

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Q. The experimental value is always smaller than the actual value, why? 1.When the vibrator strikes the ticker tape, it produces friction which slows down the falling motion. 2.The falling motion is slowed down by air resistance.

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The “coin and feather” experiment

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fall in airfall in vacuum coin feather Acceleration due to gravity (g)

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Why does the feather fall down slower than the coin in air?

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fall in air fall in vacuum gravitational force air resistance

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Air resistance depends on: Size of the object Shape of the object Its velocity => parachute

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A ball is thrown vertically upwards at an initial velocity of 100 m s -1. What is the acceleration of the ball along the time of flight?

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Acceleration always equals to 10 ms -2 pointing downwards

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