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Work and Machines
Unit 14 Acellus Physical Science
Term | Definition |
---|---|
work | when an object moves a distance due to a specific force |
machine | a device that can make work easier |
compound machine | a device made of two or more simple machines |
lever | a bar that pivots around a central point called a fulcrum |
inclined plane | a flat surface that slopes |
wedge | two inclined planes put back to back |
screw | inclined plane wrapped around a post |
wheel and axle | two circles that orbit about an axis |
pulley | a grooved wheel with a cable wrapped around it |
mechanical advantage | number of times a machine multiplies the effort force |
input force | force put into a machine, the effort force |
output force | the force the machine exerts on an object |
resistance force | the force that opposes effort |