Unit 3 Simple Machines

Review Game

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1. All machines have moveable parts

FalseTrue

2. If you want to exert less effort to get work done you will have to complete it over _?_.

More distance More force

Less distance Less force

3. A stair case is a good example of which type of simple machine?

Inclined Plane

Wheel & Axle

Screw

Lever

4. If Mary climbs a hill in less time than Jack, her _?_ increases.

Output

Time

Work

Power

5. Which type of simple machine does a crane represent?

Lever

Wedge

Pulley

Screw

6. A second class lever has the _?_ in the middle.

Load

Fulcrum

Work

Effort

7. A series of simple machines that complete a silly task is name after what man?

Archimedes

Goldberg

Newton

Aristotle

8. If you want a job to take less time you must use more _?_ to get it done.

Efficiency

Input

Work

Power

9. The two most basic simple machines are _?_ and _?_

Wheel and Axle

Wedge and Inclined Plane

Inclined Plane and Lever

Pulley and Screw

10. The lid of a jar is an example of what simple machine?

Screw

Pulley

Wedge

Lever

11. In a _?_ class lever the EFFORT is in the middle.

3rd

2nd

4th

1st

12. The three parts of a lever are _?_.

Wheel/Axle/Bar

Effort/Fulcrum/Load

Pivot/Bar/Load

1st/ 2nd/3rd

13. An example of a lever would be _?_

A chisel

A car tire

A door

A ramp

14. A machine that contains two or more simple machines is called _?_

Compound

Complicated

Confusing

Conjugated

15. Mechanical Advantage tells us how much _?_.

The machine multiplies the force

Efficiency a machine has

Work is done

Effort is exerted

16. John applies a force of 20 N to move a box 10 m. How much work is done? (W= F X D)

200 W 200 m

200 N 200 J

17. Which of the following simple machines is a wedge?

Slide

Door stop

Stair Case

Flag Pole

18. If two people lift identical stacks of books the same distance but one person does the job faster, which of the following increases?

Advantage

Efficiency

Power

Work

19. A device that makes work easier by changing the size or direction of the force is a _?_.

Wheel & Axle

Inclined PlanePulley

All of the above

20. When using a machine if you increase the distance the force will _?_.

Increase than Decrease

Decreases

Increase

Stay the same

21. A machine cannot have 100% efficiency because of _?_

Force

Work

Friction

Effort

22. If two people move a box the same distance but one does it faster, the person who did it faster had to increase _?_.

Power

Work

Velocity

Effort

23. The tip of a screw is an example of what simple machine?

Wedge

Lever

Wheel & Axle

Inclined Plane

24. A construction worker is lifting a load of bricks onto a truck and he does 220 J of work in 30 seconds. How much power did he use? (P=W/t)

6600 W

7.33 W

7.33 J

6600 J

25. Which of the following must happen for work to be done?

Neither A or B

A force must be applied

Both A and B

An object must move

26. If you want to lift a heavy load using a pulley you should _?_ to make the load easier to lift.

Add pulleys

Remove pulleys

Pull down

Pull up

27. A bow of a boat cutting through water is an example of _?_.

An Inclined Plane

A Wedge

A Screw

A Lever

28. The petals in a car represent _?_

A Pulley

A Lever

A Screw

A Wheel & Axle

29. The gas cap on a mower represents _?_.

A Wedge

A Screw

A Pulley

An Inclined Plane

30. A shovel is an example of a _?_ class lever.

3rd

None2nd

1st

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