click below
click below
Normal Size Small Size show me how
Physical Science
Chpt 7 vocab for final
Term | Definition |
---|---|
Machine | a device doing some kind of work |
Simple Machine | the general term for the six tools that make work easier |
Work | the exchange of energy for some change in a physical system |
Mechanical Work | when a force acts on an object to move it in a direction parallel to the force vector |
Compound Machine | more than one simple machine working together |
Effort | the amount of work being exerted |
Inclined Plane | a tilted surface which allows a resistance to be lifted with less effort |
Pulley | a wheel with a groove containing a rope or cable |
Wedge | two inclined planes in the shape of a V that is used to split an object |
Screw | an inclined plane wrapped around a central shaft in a spiral shape |
Gear | wheel and axle combinations with notches or teeth around the circumference |
Wheel and Axle | a rotating object where the force is applied at some distance from the axis |
Lever | a rigid bar that turns on a point, or a fulcrum |
Joule | unit of work |
Watts | unit of power |
Newton | unit of force |
Time | the non-physical continuum that orders the sequence of events |
Percent | what efficiency is expressed as |
Power | work divided by interval of time |
Force | work is this times distance; a push or pull |
Meters | units used to measure distance |
Work | force times distance |
Fulcrum | the part of the lever that supports the length of the bar |
Resistance | a load; the system that needs to be moved |