Blocks A and B are connected by a light thread that runs over a frictionless pulley. Block A is stationary on a rough horizontal surface, and block B is held stationary just below the pulley.
Fig. 1.1 shows the thread hanging slack.
The diagram labels: block A on a rough horizontal surface, a pulley, a thread, and block B hanging vertically.
Block B is released and drops vertically. The thread remains slack until block B has fallen 0.45 m.
Block B has a mass of 0.50 kg.
(a)[2]
Calculate the change in the gravitational potential energy (g.p.e.) of block B as it drops through 0.45 m.
(b(i))[3]
Calculate the impulse exerted on block A as it speeds up from rest to 0.60 m/s.
(b(ii))[3]
Both blocks now travel at a constant speed of 0.60 m/s until block B reaches the ground and the thread goes slack. Explain the energy change that occurs in block A after block B stops moving.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “2.3 J.” …