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Science > Simple machine > Flashcards

Simple machine Flashcards

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0
Q

What is efficiency?

A

The ratio of work output to the work input of a machine

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1
Q

What is a compound machine?

A

A machine that is a combination of 2 or more simple machines

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2
Q

What is the resistance arm?

A

The distance from the resistance force to the fulcrum of a lever

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3
Q

What is effort force?

A

The force that is applied to do work

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4
Q

What is a fixed pulley?

A

A pulley that is attached to something that does not move

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5
Q

What is a fulcrum?

A

The fixed point of a lever

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6
Q

What are gears?

A

Interlocking toothed wheels of a machine

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7
Q

What is effort arm?

A

The distance from the effort force to the fulcrum of a lever

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8
Q

What is an inclined plane?

A

A simple machine that has a sloping surface that is longer than its vertical side

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9
Q

What is a joule?

A

A unit of work equal to one Newton-meter

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10
Q

What is a lever?

A

A simple machine that consists of a bar that turn or pivots, around a fixed point

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11
Q

What is the resistance distance?

A

The distance that a resistant force moves

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12
Q

What is mechanical advantage?

A

The number of times a machine multiplies an effort force

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13
Q

What is power?

A

The amount of work done over a period of time

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14
Q

What is a pulley?

A

A machine that is made up of a rope that turns around a wheel

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15
Q

What is the resistant force?

A

A force that opposes motion

16
Q

What is a simple machine?

A

A device that changes the size or direction of a force being used to do work

17
Q

What is a wheel and axle?

A

A simple machine that consists of two wheels that turn around the same pivot

18
Q

What is work?

A

Using force to move an object through a distance

19
Q

What is ideal mechanical advantage?

A

The calculation of mechanical advantage based on effort and resistance distances (it ignores friction)

20
Q

What are the three parts of a lever?

A

The fulcrum, effort arm, and the resistance arm

21
Q

What are the six simple machines?

A

Inclined plane (ramp)
Pulley (elevator, curtains, flagpole, Eric)
Wheel and axle (steering wheel, door handle)
Wedge (door stop, knife, cheese)
Screw (bottle cap)
Lever (see-saw, light switch)

22
Q

What is actual mechanical advantage?

A

The calculation of mechanical advantage based on effort and resistance forces

23
Q

How many watts are in kilowatts?

A

1000

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