4. A Ballistic pendulum is set into a swing motion after colliding with a ball m

Question

4. A Ballistic pendulum is set into a swing motion after colliding with a ball moving horizontally with a speed Vo. A diagram below shows part of a swing from the bottom positon A to a top position B of a swing cycle. LB Height gain Zero Reference level a) The mechanical energy (kinetic energy+ potential energy) at position A is (equal/ not equal) to that at B. b) The mechanical energy associated with position A is in the form of__ c) The mechanical energy associated with position B is in the form of_

Explanation / Answer

A. Equel

If it is considered that the bullet does not deform or release heat, in order to use the calculations of the ballistic pendulum, the mechanical energy at point A must be equal to the mechanical energy at point B.

B. Kinetic energy
The mechanical energy at point A is only kinetic energy, because as it is considered a reference at that level, there is no gravitational potencal energy.

C. Potential gravitational energy.
At point B, the pendulum does not move, therefore the only energy that exists is that associated with the height with respect to the reference level, which is the gravitational potential energy.

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