A superball and a soft gooey material have equal inertias, m = 10g. They are dro

Question

A superball and a soft gooey material have equal inertias, m = 10g. They are dropped side by side from a height of 10 meters to a hardwood floor. The goo sticks, while the superball bounces right back to where it came from.

(a) The instant before impact with the floor, what is the kinetic energy of each object?

(b) When the objects deform and stop at the floor, what is the kinetic energy of each object? Where did the energy go?

(c) After the collision, the superball is just starting to head back to the point from which it was released, and the putty is still stuck to the floor. What is the kinetic energy of each object now?

(d) What

Explanation / Answer

a)

here , for both the balls ,

v =sqrt(2*gh)

KE = mgh

KE = .010 * 9.8 * 10

KE = .98 J

Kinetic energy of both the balls is 0.98 J

b)

When they stop , the Kinetci energy is zero and it is stored as elastic potential energy of the balls

c)

Now , the superball has it's kinectic energy while energy of putty deformed the putty

d)

PE = mgh

PE = 0.98 J

e)

for superball , it is conservative

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