1. Two blocks, A and B are attached by means of a light inextensible string running over a smooth pulley, as shown in the diagram below. Block A is accelerating along a smooth horizontal surface in the direction shown, block B is moving towards the ground. Both A and B are modelled as particles.

Explain what effect each of the following assumptions have on the model described above.

 (i) A and B are both particles.

(ii) The string is light.

(iii) The string is inextensible.

(iv) The pulley is smooth and light.

(v) The surface A is moving along is smooth.