Chapter 12 Work And Energy Flashcards

1
Q

Work

A

Transferring of energy to a body by the use of force that causes the body to move in the direction of the force

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2
Q

Power

A

Quantity that measures the rate of how work is done or energy is transformed

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3
Q

Mechanical advantage

A

Tells yo how much a machine multiplies force or increases the distance

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4
Q

Joule

A

How energy is measured

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5
Q

Watt

A

Measurement of power

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6
Q

Simple machines

A

The most basic machines

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7
Q

Compound machines

A

A machine that is made of more than one simple machine

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8
Q

Lever

A

Machine that have a rigid arm that turns around at a point and where force is transferred from one part to another

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9
Q

First class lever

A

Levers that have a fulcrum that is between the points of application of the input and output forces

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10
Q

Second class lever

A

Levers where the fulcrum is arm one end of the arm and the input force is applied to the other end

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11
Q

Third class levers

A

Levers that multiply distance rather than force

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12
Q

Pulley

A

Modified lever that is used to lift things

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13
Q

Block and tackle

A

A single unit where multiple pulleys that are put together

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14
Q

Wheel and axel

A

A lever that is connected to a shaft

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15
Q

Inclined plane

A

Helps turn a small input force into a large output force by spreading the work over a larger distance

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16
Q

Wedge

A

Turns a downward force into two forces directed out to the sides

17
Q

Screw

A

Helps bind things closer together and keeping them together until you want them apart

18
Q

Potential energy

A

Energy that an object has because of its position, shape, or condition

19
Q

Kinetic energy

A

Energy of a moving object due to its motion

20
Q

Mechanical energy

A

Amount of work an object can do because of its kinetic and potential energies

21
Q

Elastic potential energy

A

Energy stored in any type of stretched or compressed elastic material

22
Q

Gravitational potential energy

A

Energy that is stored in the gravitational field that is between any two or more objects

23
Q

Nonmechanical energy

A

Doesn’t effect systems on large scale

24
Q

Efficiency

A

The ratio of useful work out to work in

25
Open system
Systems that exchange energy with the space that surrounds them
26
Closed systems
System when the flow of energy into and out of a system is small enough that I could possibly be ignored
27
Perpetual motion machine
Theoretical machines that have complete absence of friction and air resistance