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| Work is done if a force moves an object a distance (object, force applied to object & object must move a distance) |
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| a measure of how far an object moves |
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| A push or pull. I can change the direction or speed of an object. |
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| a force caused by objects rubbing |
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| A force that pulls objects toward the earth. |
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| A slippery material that reduces friction. A liquid lubricant such as oil helps reduce friction. |
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| a tool that makes work easier |
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| a tool with few or no moving parts |
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| Push-pull meter & spring scales |
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Definition
| tools that measure how much force is used to move an object |
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| In order to sue less force, the force must be applied over a longer distance |
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| Leer, inclined plane, wheel and axle, pulley, wedge, screw |
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| A simple machine made of a bar that pots or turns on a fulcrum. |
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| What are the 3 kinds of levers? |
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Definition
| First class: (See-Saw), Second Class: (Wheel Barrow), Third Class: (Shovel) |
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| Simple machine with inclined planes. A wedge changes the direction of force. |
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| Inclined plane wrapped around a center post. Screws work by 1) Changing the direction of the force as you turn the screw and 2) You do less work |
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| A flat surface with one end higher than the other. A ramp is an inclined plane |
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| Rigid beam or bar of a lever |
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| A shaft inserted in the middle of a wheel |
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Definition
| Round, tube shaped object |
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| Resistance to motion that occurs whenever the surfaces of two objects rub against each other |
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| The support around a lever arm pivots (the base of a see saw) |
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| The narrow area in the outer rim of a pulley wheel where a rope or chain is |
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| The inclined plane that is wrapped around and comes out of the shaft of the screw: The spiral ridge of the screw |
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Definition
| Any circular object that turns around a center point or axis |
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