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18 Cards in this Set

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  • Back
Friction
A force that resists motion in 2 objects that are moving against each other.
Mechanical Advantage (MA)
A measure of how much a machine increases a force applied to it.
Efficiency
A measure of the amount of useful work done by the machine compared with the amount of work done to make the machine operate.
Effort Force
The force needed to do the same work with a machine.
Power
The amount of work done or energy provided in a period of time.
Nonrenewable Resources
Resources that can't be replaced once they're used or can be replaced over long periods of time.
Ideal Mechanical Advantage (IMA)
Mechanical advantage that doesn't take friction into account.
Machine
A device that makes work easier by changing the size or direction (or both) of a force.
Renewable Resources
Resources that are constantly available or that can be replaced in a relatively short time.
Actual Mechanical Advantage (AMA)
Mechanical advantage that takes into account friction and any other forces working against the efficient operation of a machine.
Potential Energy
Energy that's stored, either becaus of an object's position, chemical make up, or elasticity.
Kinetic Energy
The energy contained in moving objects.
Energy
The ability to do work.
Law of Conservation of Energy
A law that states that energy can't be created or destroyed.
Work
The action that results when a force causes an object to move; part of the direction of the motion must be in the same direction as the force.
Resistant Force
The force needed to do work without a machine.
Work Output
The amount of useful work done by a machine.
Work Input
The amount of work done to make a machine operate.