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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
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
12. The three parts of a lever are _?_.
Wheel/Axle/Bar
Effort/Fulcrum/Load
Pivot/Bar/Load
1st/ 2nd/3rd
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
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
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
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