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PS Chapter 4 Vocab

energy and work

force a push or pull exerted on an object
work Force applied through a distance
machine a device that changes the force or increases the motion from work.
simple machine a machine that does work with only one movement of the machine
compound machine a combination of two or more simple machines
efficiency the ratio of the output work to input work measured in percent
mechanical advantage the ratio of output force to input force.
energy the ability to do work
system anything around which you can create a boundary or imagine a boundary
kinetic energy energy due to motion (1/2 mass x velocity squared)
potential energy stored energy due to interactions between objects
elastic potential energy energy that is stored by compressing or stretching an object
chemical potential energy energy that is stored in chemical bonds
gravitational potential energy energy that is due to the gravitational forces between objects (mgh)
friction a force that opposes the sliding motion of two surfaces that are touching
law of conservation of energy energy cannot be created or destroyed, only converted from one form to another
mechanical energy the sum of kinetic and potential energies of the objects in a system.
power the rate at which energy is converted (energy per time). Measured in watts.
Created by: PRO Teacher jhaase