A Solid Ball of Mass 1

question 25

Essay

A solid ball of mass 1.0 kg and radius 10 cm rolls with a forward speed of 10 m/s when it
comes to a hill. There is enough friction on the hill to keep the ball from slipping as it rolls
up.
(a) How high vertically up the hill can the ball roll before coming to rest?
(b) How high vertically could the ball go if the hill were totally frictionless?
(c) How is it that the ball can go higher with friction than without friction?

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Definitions:

Reality

The quality or state of being actual or true and the totality of all things possessing actuality, existence, or essence.

Appearance

The way in which someone or something looks or is presented to the senses.

Egocentrically

Thinking solely from one's own viewpoint, often with difficulty in understanding or considering the perspectives of others.

Preoperational Stage

A stage in Piaget's theory of cognitive development, where children from about 2 to 7 years old develop memory and imagination.