Question

A) Explain what is meant by work.
B) i Explain how the principle of conservation of energy applies to a man sliding from rest down a
vertical pole if there is a constant force of friction acting on him.
ii The man slides down the pole and reaches the ground after falling a distance h = 15 m. His
potential energy at the top of the pole is 1000 J. Sketch a graph to show how his gravitational
potential energy Ep varies with h. Add to your graph a line to show the variation of his kinetic
energy Ek with h.

Answer 1

to do something which needs physical or mental effort, in order to earn money or to achieve something

Answer 2

Answer:

Explanation:

conservation of energy when a body fall from a height h, its kinetic energy increses and its gravitational potential energy decreases

Loss in g.p.e = gain in k.e. + heat due to friction