Question

A child with a mass of 39 kg stands on a spring scale inside an elevator. For each of the scenarios below, draw a force diagram of the forces acting on the child and calculate the reading of the scale in newtons.

(a) The elevator is at rest.

_______ N

(b) The elevator is accelerating downward at 1 m/s2.

_______ N

(c) The elevator is moving upward at a constant velocity of 9 m/s.

________N

(d) The elevator is accelerating upward at 3 m/s2.

_______ N