Question

1. (a) a man uses a uniform plank to lift a block. he holds the plank horizontal. the arrows on the diagram represent three forces on the plank. complete the table to identify the missing force.

force	name of force
1200 n	weight of block
200 n

Explanation:

The 200 N force is acting at the center - of - mass of the uniform plank. Since it is at the center of the plank and the plank is uniform, this force is the weight of the plank.

Answer:

weight of the plank