Science Ch 3 Flashcards

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0
Q

Joule

A

The amount of work you do when you exert a force of 1 newton to move an object a distance of 1 meter.

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1
Q

Work

A

Force exerted on an object that causes it to move.

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2
Q

Power

A

The rate at which one form of energy is transformed into another.

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3
Q

Watt

A

The unit of power when one joule of work is done in one second.

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4
Q

Machine

A

A device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which force is exerted.

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5
Q

Input Force

A

The force exerted on a machine.

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6
Q

Output Force

A

The force exerted on an object by a machine.

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7
Q

Mechanical Advantage

A

The number of times a machine increases a force exerted on it.

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8
Q

Efficiency

A

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

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9
Q

Simple Machine

A

The most basic device for making work easier, these are the smaller building blocks for complex machines.

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10
Q

Inclined Plane

A

A simple machine that is a flat, sloped surface.

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11
Q

Wedge

A

A simple machine that is an inclined plane that moves.

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12
Q

Screw

A

A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral.

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13
Q

Lever

A

A simple machine that consists of a rigid bar that pivots about a fixed point.

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14
Q

Fulcrum

A

The fixed point around which a lever pivots.

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15
Q

Pulley

A

A simple machine that consists of a grooved wheel with a rope or cable wrapped around it.

16
Q

Wheel and Axle

A

A simple machine that consists of two attached circular or cylindrical objects that rotate about a common axis, each one with a different radius.

17
Q

Compound Machine

A

A device that combines two or more simple machines.