Peragraph Styles Themes res New Roman-112 A, o-ni-na-. Text Box · Themes Phy 101

Question

Peragraph Styles Themes res New Roman-112 A, o-ni-na-. Text Box · Themes Phy 1010-Chapter S Activity: Swinging Bowling Ball A bowling ball is suspended from the ceiling of a lecture hall by a strong cord The ball is drawn away from its equilibrium position and released from rest at the tip of the demonstrator's nose, as shown in the figure below. (a) If the demonstrator remains stationary, explain why the ball does not strike her on its return swing (b) Would this demonstration be safe if the ball were given a push from its starting position at her nose? Why, or why not? Print Layout view Sec 1 Pages: of 2 Words

Explanation / Answer

a) This is a very famous law of conservation of mechanical energy according to which the total amount of mechanical energy, in a closed system remains constant but there should not be any dissipative force like friction or air resistance. This means that potential energy can become kinetic energy, or vice versa, but total mechanical energy can neither decrease or increase.

so the ball doesn't strike her face on return swing as ball can only retain the same previous potential energy out of kinetic energy.

b) No, the demonstration will not be safe if it is given a push or external kinetic energy. As on return journey ball will convert all its kinetic energy into potential energy and this time potential energy will become greater than it would have been if it was just released without any push. An increased potential energy means greater height it will reach.

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