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Independent Review Work 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 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 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 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 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 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