Physics Question?

Question

A 20.0 kg box rests on a table. What is the weight of the box and the normal force acting on it? A 10.0 kg box is placed on top of the 20.0 kg box. Determine the normal force that the table exerts on the 20.0 kg box and the normal force that the 20.0 kg box exerts on the 10.0 kg box.

Please show/explain work clearly.

Answer 1

For just the 20 kg box the normal force is
m*g, or 20.0*9.81

For the two boxes, at the table interface
30.0*9.81

at the interface of the boxes
10*9.81

j