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Unit 2 ls. 1-3
vocabulary
Term | Definition |
---|---|
work | is the use of force to move an object some distance in the direction of the force. |
energy | is the ability to do work. |
power | is the rate at which work is done. |
kinetic energy | is the energy of motion. |
potential energy | is the energy an object has because of its position or condition or chemical composition. |
mechanical energy | is the energy possessed by an object due to its motioin and position. |
machine | is any device that helps people do work by changeing the way work is done. |
mechanical advantage | is the number of times the machine multiples the input force. |
mechanical efficiency | is a comparison of machines work output with the work input. |
lever | is a simple machine that has a bar that piviots at a fixed point. |
fulcrum | levers are used to apply a force to move an object. |
wheel and axle | is a simple machine that is made of a wheel connected to a smaller cylinder object the axel. |
pulley | is a simple machine that has a grooved wheel that holds a rope or a cable. |
inclined plane | is a simple machine that is straight. |