Question

A 350 kg crate is being LOWERED by a person a distance 10 m
with a force (FP) of 80

N(the person is pulling upward but the crate is moving
downward). The rough ramp

exerts a constant force of friction of 70 N. The angle that
the ramp makes with the

0 floor is 30 .

(a) Draw a free body diagram for the crate.

(b) What is the work done by the person on the crate?

(c) What is the work done by the force of friction on the
crate?

(d) What is the work done by the gravitational force?

(e) What is the work done by the normal force?

(f) What is the net work done on the crate?

(g) What is the final velocity of the crate, assuming it
started from rest?

(h) What is the acceleration of the crate while it is being
lowered?

(i) How much time does it take for the person to lower the
crate this distance?

Answer #1

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