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Independent Review
Work
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What is the definition of work?
o To apply a force to an object and the object moves a distance.
Does a simple machine reduce your amount of work?
OR
Does a simple machine reduce the amount of force required to do work?
Levers
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The fulcrum is a ______ point.
o fixed
If you wanted to move or lift a heavy object using a lever, where would you move
the fulcrum?
o You would want to move the fulcrum near the object that is the heaviest!
o The father you are away from the load the less effort you have to apply to
your end.
Spring Scales
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What is the MAIN purpose of spring scales?
o To measure force in Newtons.
Give an example where you might want to use a spring scale.
o If you are pulling a box or a cart up an inclined plane the spring scale will
tell us how much force is required to move the object up the inclined
plane.
What are the two measurements that spring scales tell us?
o Force (Newtons) and Weight (grams or kilograms)
Pulleys
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What are the two types of pulleys?
o fixed and moveable
What is a block and tackle?
o A combination of many pulleys, used for lifting or pulling heavy objects.
Ideal Efficiency & Friction
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What is the ideal efficiency of a machine?
o 100%
If you reduce the friction of the machine the machine will be ____ efficient.
o More
Old Test Review
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What rotates in a simple electric motor?
o electromagnet
Power plants make electric energy for our homes.
What is the most likely transformation?
o Mechanical kinetic to electric
Opposite charges __________ and like charges __________.
o Attract, repel
At which point is the magnetic field the strongest?
o On the poles of the magnet
Heat energy is transferred in liquids and gases by….
o convection