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Question

# A 0.25kg ball is dropped from a height of 5m. It bounces back to a height of 4.05m. If the impact of the

ball with floor lasted 0.01s, find the average force that the floor exerted on the ball.

Steps:

Find the velocity of the ball immediately before it hits the ground (use kinematics: therefore you need

a picture, define your coordinate system etc).

Find the velocity of the ball immediately after it hits the ground (kinematics again) (use the same

coordinate system that you defined for the way down).

BONUS draw position, velocity and acceleration versus times graphs for the bouncing ball.

Then use the definition of

a

av

=

v

t

to find the average acceleration.

Draw a FBD of the ball hitting the floor including the direction of the acceleration. Apply Newton's

second law in the vertical direction and solve for the normal force

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Subject: Physics, Science

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