The principle that the amount of energy iin any system remains the same, even if the form of the energy changes
Conservation of matter
The principle that the amount of matter in any system remains the same, even though it may have gone through physical or chemical change
Elastic potential energy
Potential energy that is created by tension in an object such as a stretch rubber band
Energy
The ability to do work
Gravitational potential energy
Potential energy due to an object's position relative to Earth or some other gravitational field
Joule (J)
The unit of energy or work
Kinetic energy
Energy of a body in motion; (1/2mv2)
Mechanical advantage
The ratio of output force to input force for a simple machine (resistance force/effort force or effort distance/resistance distance)
Potential energy
Stored energy because of its position or tension (mgh)
Simple machine
Any of the devices that work with one movement; includes the lever, wheel and axle, pulley, inclined plane, wedge, and screw
Work
The transfer of energy, measured as the product of the force applied to an object and the distance moved by that object in the direction of the force applied; equal to force x distance (f x d)
Power
The rate at which work is done (W/t)
Efficiency
The amount of work output divided by the work input expressed as a percentage
Effort distance
The distance an input force moves in a simple machine
Resistance distance
The distance the output force moves the resistance
Biology Lab Midterm
