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Chem Phys > Chapter 14 > Flashcards

Chapter 14 Flashcards

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1
Q

What is power? And what are its units

A

The rate of which work is done, work divided by time. Joules per second and watts per horsepower

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2
Q

1 hp equals how many watts

A

746 W

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3
Q

What does the mechanical advantage or MA tell us?

A

How much the machine makes the force easier

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4
Q

How do machines make work easier

A

By making the distance greater and force less

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5
Q

Define effort and resistance force:

A

Effort force is the input force on the machine. Resistance force is the output force done by a machine

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6
Q

What is efficiency, how do we decrease it

A

Output work divided by input work, decreased the friction

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7
Q

What would be true about work input and output if there wasn’t any friction

A

They would be the same

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8
Q

How do inclined planes make work easier?

A

They increase the distance

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9
Q

What is a wedge

A

To inclined planes back to back

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10
Q

How can we increase the MA have a wedge?

A

Make it less steep and longer

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11
Q

Define a screw

A

Inclined plane wrapped around a cylinder

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12
Q

How does a screw multiply it’s effort?

A

By spreading out The force

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13
Q

What is a fulcrum

A

The pivot point on a lever

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14
Q

Give two examples of each class of a lever

A

First class, seesaw and scissors

Second class, wheelbarrow and door

Third class, broom and bat

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15
Q

What is work? What are its units?

A

The movement of the force applied to an object, Force multiplied by distance. Joules and Newton meters

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16
Q

What is friction

A

The force that limits the efficiency of the machine

17
Q

Is work output always greater than work input?

A

Yes

18
Q

True or false, machines make work easier by multiplying the force

A

True

19
Q

What is the advantage of using a third class lever?

A

The mechanical advantage is less than one

20
Q

Define a wheel and axle

A

A simple machine with two cylinders of different sizes

21
Q

Define a pulley

A

Simple machine that consists of a rope and wheel

22
Q

What can a movable pulley do, that a fixed pulley cannot?

A

Change the size of the force

Chem Phys (6 decks)

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