1. You push your physics book 1.20m along a horizontal table top with a
horizontal force of 3.00 N. The opposing force of friction is 0.600 N.
a.) Find the amount of Work done by your 3.00N force on the book.
b.) Find the amount of Work done by the 0.600N force of friction acting on the book.
c.) Find the total Work done on the physics book over the 1.20m displacement.
d.) Find the work done by the normal force over the 1.20m displacement.
2. A factory worker pushes a 25 kg crate a distance of 23m over a flat horizontal
floor at a constant velocity by pushing horizontally. The coefficient of kinetic friction
between the crate and the floor is 0.34. a.) What force must the worker be providing
to produce this force?
b.) Find the work done on the crate by the force produced by the
worker over the 23 m.
c.) Find the work done by friction on the crate over the 23m.
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d.) Find the net Work done on the crate.
e.) Find the work done by the normal force on the crate over the 23 m.
3. Jack reaches the top of the hill with his bucket and lowers the bucket
straight down into the well using a rope. The bucket reaches the water and
Jacket uses the rope to pull the bucket up to the top. The bucket is raised
15.2m from the water to the top of the well and has a total mass of 50kg when
full of water. a.) Find the Work done by Jack on the bucket while raising it to
the top.
b.) Find the work done by the force of gravity on the bucket
over the 15.2m.
c.) Find the net Work done on the bucket while the bucket was
raised from the water to the top of the well.
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4. Jerry decides to skip the stairs to the local library and use the ramp. The
ramp has a length of 12.5 m along the incline and raises Jerry 4.0 m above the
ground. Jerry has a mass of 400 kg.
a.) Find the work done by the ramp on Jerry.
b.) Find the work done by gravity on Jerry.
5. Jared has tired of sandwiches. He exerts a force on the
sandwich over distance of 0.3m. Jared exerted a net force
of 15N parallel to the 0.3m length. If Jared acted on the
sandwich for 0.51s, determine the power produced by
Jared.
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6. From problem #3, Jack is able to raise the full bucket of water in 75s.
a.) Determine the power produced by Jack.
b.) Determine the average speed of the bucket.
7. A certain rain cloud at an altitude of 15 km contains an
amount of water with a mass of 200 kg. How long would
it take a 10 KW electric water pump to raise the same
amount of water from the ground.
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