Unit VII Exam – Energy

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Physics
Work, Power, Energy Review
***The following is not all inclusive
Be able to solve for and know the units for:
Kinetic Energy, Potential Energy, Mechanical Energy, velocity, mass, height, work, power, force, distance
Be able to define and example of:
Energy, Kinetic Energy, Potential Energy, Mechanical Energy, velocity, mass, height, work, power, force, distance
Understand the Law of Conservation of Energy and be able to apply the concept to problems
Label and calculate the potential and kinetic energy off of diagrams.
Example problems
1.
How much work does it take to push a 2kg mass across a horizontal displacement of 7m while using a force of 5N?
2.
A winch on a boat pulls a 50N anchor up 2 meters in 80 seconds. How much work does the winch do to pull the
anchor up out of the water? What is the power rating of the boat?
3.
How much gravitational potential energy does the anchor gain as it is lifted?
4.
A shark is swimming at a speed of 4.3m/s without moving up or down in the water. Its kinetic energy is 1700J. What
is the shark’s mass?
5.
A bulldozer does 30,000 J of work to lift a boulder a distance of 25m. How much did the boulder weigh?
6.
A window washer stands on a scaffolding 30m above the ground. If he did 23,520J of work to reach the scaffolding,
what is his mass?
7.
A motor does 5000J of work in 20s. What is the power of the motor?
8.
A 1000W microwave oven takes 90s to heat up a bowl of soup. How many Joules of energy does it use?
9.
Doubling the velocity of an object will _______ its kinetic energy.
10. Doubling the position of an object above a given reference level will _______ its potential energy.
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