Unit 5 Work, Power, and Efficiency Study Guide
Name:__________________ Date:________
- In science – _________ is the result of a force causing something to move.
- If the distance is 0m was any work done?
- You do work on an object that you move? True or False
- Work =
- The unit of measurement for work is______
- Power = Work/_______
- The more time you take the (more or less) power you use?
- Which was the most power?
A. You ran up the stairs in 10 seconds.
B. You ran up the stairs in 7 seconds.
Which was the most work?
- If I lift a 50N barbell 10 times in 2 minutes and you lift a 50 N barbell 10 times in 30s, who did more work? Used more power?
- The motor of an electric fan exerts a force of 24,000 N to move a distance of 1m in 60s. What is the power?
- If you have two forces acting upon each other at an equal strength, what are the forces said to be? (neutral, balanced, even, strong)
- How is force illustrated? Does the length of the arrow indicate anything?
- What are the six simple machines?
- ___________
- ___________
- ___________
- ___________
- ___________
- ___________
- A compound machine is a series of _______ ________
- What can I do to a ramp to decrease the amount of force used?
- What can I do to a see-saw to increase the downward force to one side?
- What is the center of a see-saw called? What type of simple machine is a see-saw an example of?
- Which types of simple machines lift? Move things on the ground?
- The force you exert on a machine is ______ _______
- The force the machine exerts is ________ ________
- How is efficiency expressed?
- Efficiency =
- Can you every have an efficiency greater than 100%? Why or why not?
- How is friction decreased? What causes friction?
- A toy crane moved a 20 N tub from the ground to the top of a ledge 5 m above the ground. If the crane used 2,000 J of energy, how efficient was the crane?
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