Q4 (a) A ball is hanging by a string from the ceiling of the roof. Draw a neat labelled diagram showing the forces acting on the ball and the string. (b) A spring is compressed against a rigid wall. Draw a neat labelled diagram showing the forces acting on the spring. (c) A wooden block is placed on a table top. Name the forces acting on the block and draw a neat and labelled diagram to show the point of application and direction of these forces.