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### 15 Cards in this Set

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 FRICTION What causes friction? Rough parts of surfaces catch on each other and create friction when they rub together. FRICTION What is the definition of friction? Friction is a force that takes place when one surface slides against another. FRICTION In what way does friction make work more difficult? With friction we must increase force for work to take place. FRICTION Does friction take place on an inclined plane? Yes, too surfaces rubbing ARCHIMEDES How did Archimedes die? soldier killed him he was too busy thinking to be afraid and did not move when he was told to do so TOOLS How do tools make work easier? It changes the force applied to work, it changes the direction of the force USE OF INCLINED PLANE What does it mean when it says an inclined plane gives the worker a mechanical advantage? It means he can exert less force to do the same amount of work. USE OF INCLINED PLANE The amount of effort we save by suing a tool is called its _______ Mechanical advantage WORK Two things must happen for work to take place. What are they? an object, or load, must move, a force must be used in the direction of the movement WORK Calculate the amount of work if 10 pounds were moved 2 feet 20 foot-pounds WORK Calculate the amount of work if 20 pounds were moved 3 feet 60 foot-pounds WORK Calculate the amount of work if 5 pounds were moved 30 yards 150 yard-pounds FRICTION Why would an engine overheat? Surfaces rubbing on each other causing friction FRICTION Explain how car brakes work. The brakes rubbing against the wheels create enough friction to stop the car. WEDGES What are some common wedges that are used every day. Some common wedges are knives, scissors, and doorstops