Review Unit 6 8 th Grade Integrated Science

1) Define work. 2) What unit is work measured in? W = F x D Joules

1) Define power 2) What unit is power measured in? P = W / T Watts

Solve A construction worker pushes the wheelbarrow with the power of 50 J per 2 seconds how much power does he use?

3) Two cars have the same weight, but one of the cars has an engine that provides twice the power of the other. Which car can make it to the top of the North Ogden Divide first? Explain. Which car does more work to reach the top of the pass? Explain.

TEAM 4) Select three of the six simple machines that you have learned about. Provide at least three examples for each machine (9 total) of where you could expect to see those machines being used.

1) Why was it important to “zero out” your scales before use?

1) What is the relationship between distance and weight for a balanced lever?

TEAM Illustrate a 1 st class, 2 nd class, and a 3 rd class lever. Label the parts of the levers and then in words describe the differences between the three levers. Under each illustration, provide at least 3 examples of objects that could represent that lever.

TEAM Based on your experiences in your labs with levers, write one rule that could be applied for each different type of lever. These rules should be focused on the effort force and how it relates to moving the resistance force.

A simple machine is used to lift a weight. What happens to the amount of force that must be exerted compared to doing the work without a machine? a. it increases b. it decreases c. it stays the same d. it can't be predicted

A simple machine is used to lift a weight. What happens to the amount of work that must be done compared to doing the work without a machine? a. It increases b. It decreases c. It stays the same d. It depends on which simple machine is used

Which one of the following simple machines is a third class lever? a. Bumper jack b. Crowbar c. Fishing pole d. Scissors e. Wheel barrow

If the blades of the scissors were lengthened, what would happen to the amount of force exerted at their tip? a. It would not change b. It would become greater c. It would become less d. It would be easier to cut tough materials

What simple machines are found in the wheelbarrow? a. inclined plane, lever b. lever, pulley c. pulley, inclined plane d. wheel, lever

Which of the following is an example of sliding friction? a. A car going down the road. b. A person sanding a board. c. A ball being pushed across a table. d. A boy climbing a greased pole. e. A boulder being moved on rolling logs.

1. What is the mechanical advantage of this inclined plane drawn above? a. 1.5 b. 2 c. 2.5 d. 3

How could the mechanical advantage of an inclined plane be increased? a. make the height taller b. increase the weight c. decrease the weight d. make the plane longer

Explain how to find the ideal MA of a lever.

What is a Mechanical Advantage?

Explain how you would find the MA of a pulley system.

What are two functions that pulleys have?

Golf 1. Which would reduce the amount of force needed to lift the weight? a. A b. B and C c. B and D d. D

Which would require you to pull the rope the farthest? a. A b. B and C c. C d. D

How many times easier to lift will "D" be than "A"? a. the same b. twice as easy c. three times easier d. four times easier