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Motion and Forces
Unit 2 : Lessons 1-4
Term | Definition |
---|---|
Work | The use of force to move an object some distance in the direction of the force |
Energy | The ability to do work |
Power | The rate at which work is done |
Kinetic energy | The energy of motion |
Potential energy | The energy an object has because of its position, condition, or chemical composition |
Mechanical energy | The energy possessed by an object due to its motion and position |
Machine | Any device that helps people do work by changing the way work is done |
Mechanical advantage | The number of times the machine multiplies the input force |
Mechanical efficiency | Comparison of machine's work output with the work input |
Lever | Simple machine that has a bar that pivots at a fixed point |
Fulcrum | The fixed point |
Wheel anxle | Simple machine that is made of a wheel connected to a smaller cylindrical object, the axle |
Pulley | Simple machine that has a grooved wheel that holdsva rope or a cable |
Inclined plane | Simple machine that is a straight, slanted surface |