# Phisical Science Vocab Chapter 14

### 26 terms by Chancetaylor

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### work

activity directed toward making or doing something.

### joule

si unit of energy.

### power

(physics) the rate of doing work.

### watt

a unit of power equal to 1 joule per second.

### horsepower

a unit of power equal to 746 watts.

### machine

any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.

### input force

the force exerted on a machine.

### input distance

the distance the input force acts through.

### work input

the work done by the input force acting through the input distance.

### work output

the work done by a machine.

### output force

the force exerted on an object by a machine.

### output distance

the distance the output force is exerted through.

the ratio of the force exerted by a machine to the force applied to it.

the mechanical advantage that a machine would have without friction.

the mechanical advantage that a machine provides in a real situation.

### efficiency

the ratio of the output to the input of any system.

### lever

a rigid bar pivoted about a fulcrum.

### fulcrum

the pivot about which a lever turns.

### input arm

the distance between the input force and the fulcrum.

### output arm

the distance between the output force and the fulcrum.

### inclined plane

a simple machine for elevating objects.

### wheel and axle

hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel.

### wedge

something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them.

### screw

slang terms for sexual intercourse.

### pulley

a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.

### compound machine

a machine made of more than one simple machine.

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