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Science - Work and Machines > Work and Machines > Flashcards

Work and Machines Flashcards

1
Q

What is needed for work to be done

A

Distance

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2
Q

Work is measured in what

A

Joules

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3
Q

SI unit of power

A

Watt

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4
Q

Why do we machines

A

Machines make it easier to do work

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5
Q

What is it called when you use a machine

A

Mechanical Advantage

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6
Q

If you increase distance what else do you increase

A

You increase Advantage

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7
Q

IMA means

A

The ideal mechanical advantage

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8
Q

AMA means

A

Actual mechanical advantage

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9
Q

IMA is always greater than what

A

AMA

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10
Q

A simple machine that consists of a rigid bar that turns on a pivot point

A

Lever

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11
Q

A force that tends to cause q rotation about a pivot point

A

Torque

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12
Q

A system is in rotational equilibrium when the sum of torques on the system is zero

A

Law of Torques

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13
Q

In the 1st class lever what os in the middle

A

The fulcrum

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14
Q

In the 2nd class lever what is in the middle

A

The output force

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15
Q

In the 3rd class lever what is in the middle

A

The input force

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16
Q

A simple machine consisting of a wheel with a rod running through its axis that acts as the pivot point

A

Wheel and Axle

17
Q

A wheel and azle is a modification of what

A

A lever

18
Q

A simple machine that consists of a wheel with teeth

A

Gear

19
Q

A simple machine that consists of a wheel and axle system with a Groove around the perimeter of the wheel in which a rope belt or cable moves with the wheel as it rotates

A

Pulley Systems

20
Q

IMA = 1

A

Single fixed pulley

21
Q

IMA = 2

A

Single moveable pulley

22
Q

IMA = number of rope segments (4)

A

Block and Tackle

23
Q

Additional pulleys mean

A

Additional friction

24
Q

More friction means less what

A

Less efficiency

25
Q

A simple machine that consists of a plane whose opposite ends are at different heights

A

Inclined Plane

26
Q

What kind of inclined planes have a higher mechanical advantage

A

Shallower

27
Q

Mechanical advantage depends on what

A

Steepness

28
Q

A simple machine consisting of two inclined planes attached at an acute and used to separate a material apart

A

Wedge

29
Q

What are two examples of inclined planes

A

A wedge and a screw

30
Q

A simple machine that consists of an inclined plane wrapped around a cone or a cylinder in a spiral pattern

A

Screw

31
Q

In a screw where does the mechanical advantage come from

A

It’s threads

32
Q

The steeper the thread the __?__ mechanical advantage you gain

A

Less

33
Q

A machine that combines 2 or more simple machines

A

Compound machine

34
Q

Example of a 1st class lever

A

Seesaw

Science - Work and Machines (1 decks)

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