Question

(2)a) A ball is rolling along a horizontal surface. It slows down and finally stops.

Explain this in terms of impetus.(something that causes a force to happen more quickly)

Explain this in Newtonian terms.

b) A student is analyzing a ticker timer tape. At one point, the dots are measured to be 3 cm apart. Calculate the instantaneous speed in m/s. Show all working. (Clue: the frequency of the ticker timer is 50 Hz.)

c)  A man of mass 69 kg is standing on a skateboard with a mass of 1 kg. Before him is a 20 kg trolley with a box of mass 260 kg. He pushes hard against the box and rolls backwards at a speed of 2 m/s. What speed will the trolley with the box be moving at? Show working.

Answer 1