Science Chapter 4: Work and Machines

22 terms by JGDenver 

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Work

Force exerted on an object that causes it to move

Wedge

An inclined plane that moves

Wheel and axle

2 circular or cylindrical objects that are fastened together and rotate about a common axis

Screw

An inclined plane wrapped around a central cylinder to form a spiral

Pulley

A grooved wheel around which is wrapped a rope, chain, or cable

Machine

A device that changes the amount of force exerted or the direction in which force is exerted

Lever

A rigid object that pivots about a fixed point

Output force

The force exerted on an object by a machine

Inclined plane

A flat surface with one end higher than the other

Joule

A unit of work to one newton-meter

Input force

The force exerted on a machine

MA

The number of times the force exerted on a machine is multiplied by the machine

Efficiency

The percentage of the input work that is converted to output work

Screw

Screw

Wheel and axle

Bike wheel

Inclined Plane

Ramp

Pulley

Ropes on a flag pole

Lever

See-saw

Compound machine

A device that contains 2 or more simple machines

body machines

Neck = Lever, Teeth = Wedges

machine

Changes the amount of force exerted, the distance over which the force is exerted, and the direction in which the force is exerted

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