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24 Cards in this Set

  • Front
  • Back

Work

Occurs when a force exerted on an object causes that object to move some distance;work = force x distance

Potential

Stored energy in an object due to its position.

Kinetic energy:

Energy an object has due to its motion.

Joules

Units of measurement for work.

Power

The rate at which work is done.

Watts

Units of measurement for power.

Work input

The work done by someone on a simple or compound machine.

Work output

The work produced by a simple or compound machine.

Force

A push or a pull; causes an acceleration

Effort force

A force applied to an object.

Resistance force

The force in which the effort force must overcome in order to do work.

Efficiency

Useful work per quantity of energy; efficiency = [output work ÷ input work] x 100

Friction

The force of two surfaces that touch.

Mechanical advantage

The number of times the input force is multiplies by a machine; M.A. = output force ÷ input force

Simple machine

A device that has only one movement; a device that makes work easier.

Compound machine

A device made up of a combination of two or more simple machines.

Compound machine

A device made up of a combination of two or more simple machines.

Inclined plant

A simple machine with a flat, sloped surface (ramp).

Wedge

A simple machine made of two inclined planes back to back; a moving inclined plane with one or two sloped surfaces.
Screw
A simple machine made from an inclined plane wrapped around a cylinder.

Lever

A simple machine consisting of a rigid rod or plank that pivots or rotates around a fulcrum.

Wheel and axle

A simple machine made from two different-sized, circular objects that are attached and rotate together.

Pulley

A simple machine made from a grooved wheel with a rope or a chain wrapped around the groove.

Gear

A simple machine consisting of toothed or pegged wheels matched together to transfer motion and force.