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forces and motion 4
Term | Definition |
---|---|
machine | something that replaces human effort and makes work easier |
simple machine | A tool that makes work easier; has few or no moving parts |
energy | the ability to do work |
work | The ability to move something |
wheel and axle | a simple machine consisting of a grooved wheel turned by a cord or chain with a firmly attached axle together with supports |
lever | a simple machine consisting of a solid bar that rotates around a pivot point; used to lift objects |
pulley | a simple machine made up of a rope wrapped around a wheel. When a downward force is applied on the rope, an upward force is created |
screw | a simple machine made up of a shaft with grooves that wrap around it going from top to bottom |
inclined plane | an object with a flat, tilted surface, a simple machine that helps things roll or slide upward off the ground |
wedge | a simple machine that can be used to split objects apart, hold objects in place, or lift objects from the ground; consists of two inclined planes joined together |