POD23-Prob#5) Collision with the floor A 1.2 kg ball drops vertically onto a flo

Question

POD23-Prob#5) Collision with the floor A 1.2 kg ball drops vertically onto a floor, hitting with a speed of 25 m/s. It rebounds with an initial speed of 10 m/s. a. What impulse acts on the ball during the collision with the floor (i.e., during the contact)? b. If the ball is in contact with the floor for 0.020s, what is the magnitude of the average force on the floor from the ball? Before collision After collision POD23-Prob#6) 2D collision An overhead view of a collision between a bouncy ball and the wall is show in the figure. The ball has a mass of 300g, and strikes the wall with a speed of 6.0 m/s at an angle of 30 degrees. It then rebounds with the same speed and angle. It is in contact with the wall for 10 ms. Use unit vector notation impulse on the ball from the wall and the average force on the wall from the ball. Collision

Explanation / Answer

5)

All in 1-dimensions, no vectors needed.

a)

J = Pf

-Pi = m (10m/s – (-25m/s)) = -1.2kg 35m/s = 42kg m/s

b)

J = Favg *t --> Favg= J/t = 42/0.02 N = 2100N

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