simple machine:a divice with few part tha makes it easier to do work.
effort force:the forces applied to a machine.
resistances forces:the forces that a machine acts against.
lever:a simple machine made of a rigid bar on a pivot point.
fulcrum:the pivot pointof a lever.
machanical advantage:the number of the times a machine multiplies the force applied.
pulley:a grooved whell that turns by the action of a rope in the groove.
wheel and axle:a simple machine made of a handle or axist attached to the centerof a wheel.
