Question

Can anyone explain me clearly about the energy and it's changes in Simple Pendulum? Plz!

Answer 1

See below.

Explanation:

The initial strike is done with kinetic energy

`1/2 m v^2 = l(1-cos theta)m g approx 1/2l theta^2 m g`

along the streaking process

`mv_A +mv_B=mv'_A+m v'_B`

with `m_B = 0` just before and `v'_A = 0` just after the strike

hence the graphic reproducing qualitatively the energy transference is 2)