Work, Power and Energy Problems
1.
Amy uses 20 N of force to push a lawn mower 10 meters. How much work does she do?
2.
Joe balances a stationary coin on the tip of his finger 20 cm from the top of the table. How much
work is Joe doing?
3.
Frank does 2400 J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his
power output?
4.
How much power is required to pull a sled if you use 60 J of work in 5 seconds?
5.
How much work does an elephant do while moving a circus wagon 20-meters with a pulling force
of 200 N?
6.
If it takes 5 seconds for you to do 1000 J of work, what is your power output?
7.
A 900 N mountain climber scales a 100 m cliff. How much work is done by the mountain
climber?
8.
A small motor does 4000 J of work in 20 seconds. What is the power of the motor in watts?
9.
A woman runs a kilometer using a force of 210 N and a power output of 500 W. How long in
minutes does it take this woman to complete 1 kilometer?
10. A model glider has a mass of 1 kg. How much potential energy does it have 2 meters off the
ground?
11.
12.The same model has a velocity of 2.2 m/s. How much kinetic energy
does it have?
13.If the same model descends 2 meters and all its potential energy is
converted to kinetic energy, what is the glider's change in velocity?
14.A full-sized glider has a weight of 4,900 N, while its pilot has a
weight of 825 N. If it is 1,000 meters off the ground, how much
potential energy do the plane and pilot have together?
15.The same glider from Problem 13 has a velocity of 35 m/s. How much
kinetic energy does it have?
16.The same glider from Problem 13 has a velocity of 35 m/s. The glider
descends 900 meters. What is its new velocity?