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SCIENCE CH 14 > science > Flashcards

science Flashcards

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1
Q

The product of force and distance.

A

Work

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2
Q

The rate of doing work

A

Power

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3
Q

The SI unit of work

A

Joule

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4
Q

The SI unit of power

A

Watt

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5
Q

The number of times that the machine increases an input force.

A

Mechanical Advantage

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6
Q

The percentage of work input and work output of a machine.

work output/work input x 100%

A

Efficiency

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7
Q

A rigid bar that is free to move around a fixed point.

A

Lever

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8
Q

The fixed point a bar rotates around.

A

Fulcrum

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9
Q

A simple machine that consists of a disk and a cylinder through it, each one with a different radius.

A

Wheel and Axle

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10
Q

A slanted surface along which a force moves.

A

Inclined Plane

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11
Q

The force you exert on a machine.

A

Input Force

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12
Q

The distance the force acts through.

A

Input Distance

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13
Q

The force that is exerted by the machine.

A

Output Force

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14
Q

The distance the output force is exerted.

A

Output Distance

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15
Q

AMA

A

Output force/Input force

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16
Q

IMA

A

Input distance/Output distance

17
Q

a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.

A

Centripetal force

18
Q

An inclined plane wrapped around a cylinder

A

Screw

19
Q

is a simple machine that consists of a rope that fits into a groove in a wheel.

A

Pulley

20
Q

is a wheel attached in a fixed location?

A

Fixed Pulleys

21
Q

is attached to the object being moved rather than to a fixed location

A

Movable Pulley

22
Q

By combining fixed and movable pulleys into a _________ a large mechanical advantage can be achieved

A

Pulley system

23
Q

is a combination of two or more simple machines that operate together

A

Compound Machines

24
Q

a device that changes force

A

Machines

25
Q

is the distance between the input force and the fulcrum

A

Input arm

26
Q

is the distance between the output force and the fulcrum

A

Output arm

27
Q

equal to about 746 watts

A

horsepower

28
Q

the mechanical advantage has to be greater than 1 equal to 1 or less than 1

A

first-class lever

29
Q

the mechanical advantage is always greater than 1

A

second-class levers

30
Q

the mechanical advantage is always less than 1

A

third-class levers

31
Q

is a V-shaped object whose sides are two inclined planes sloped toward each other

A

Wedge

SCIENCE CH 14 (1 decks)

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