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STUFF > Ch.14 Physics > Flashcards

Ch.14 Physics Flashcards

1
Q

Is work done on an object that moves in the opposite direction of the force acting on it?

A

No

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2
Q

What is the SI unit of work?

A

Joule

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3
Q

What is power?

A

The rate of doing work

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4
Q

How do you find power?

A

Dividing work over time

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5
Q

What is the SI unit if power?

A

Watt

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6
Q

How many joules of work is horsepower?

A

746J

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7
Q

What does a machine do?

A

Changes the direction,size,and distance of force making work easier

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8
Q

The work done by a machine is always less than the work done on a machine due to ________.

A

Friction

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9
Q

How do you find work input?

A

Input force•input distance

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10
Q

The number of times that a machine increases input force is the ________ ________.

A

Mechanical advantage

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11
Q

Which has less friction a bumpy rough ramp or a smooth surfaced ramp? Which requires more force to get up?

A

Smooth surfaced ramp; bumpy rough ramp

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12
Q

Does a rough loading ramp gave a greater MA than a smooth one?

A

No

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13
Q

What is IMA?

A

MA in the absence of friction

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14
Q

Is an inclined plane a machine?

A

Yes

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15
Q

Why is efficiency always less than 100%?

A

Friction is always present

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16
Q

Reducing friction ________ the efficiency of a machine.

A

Increases

17
Q

What are the six simple machines?

A

Lever,pulley,wedge,screw,wheel and axel, and inclined plane

18
Q

What is a screwdriver being used to open a paint can an example of?

A

Lever

19
Q

What is the fixed point that a lever rotates around?

A

Fulcrum

20
Q

What characteristics distinguish levers as first,second,or third class?

A

Fulcrum,input force,output force

21
Q

What is a slanted surface along which a force moves an object to different elevation?

A

Inclined plane

22
Q

Screws with threads closer together have a greater what?

A

IMA

23
Q

What is a simple machine consisting of rope fitted into a grooved wheel?

A

Pulley

24
Q

What is a compound machine?

A

A combination of two or more machines that operate together

25
Q

What three things are compound machines?

A

Watch,car,and washing machine

26
Q

What is work output over work input • 100?

A

Efficiency

27
Q

What does dividing output work by output force find?

A

Output distance

28
Q

What is the distance between the fulcrum and input force?

A

Input arm

29
Q

What is a machine has IMA that increases when it’s thickness decreases relative to its length?

A

Wedge

30
Q

What is exerting in a jack handle to lift a car an example of?

A

Input force

31
Q

What is the distance between the output force and fulcrum?

A

Output arm

32
Q

What is the distance input force acts through?

A

Input distance

33
Q

In science, when work is done an ________ acts on an object in the direction the object moves.

A

Force

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