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Science > Chapter 16- Machines > Flashcards

Chapter 16- Machines Flashcards

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0
Q

What unit is work measured in?

A

A joule (J)

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1
Q

What is the formula for work?

A

Work= force x distance

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2
Q

What is any device that helps people do work?

A

Machine

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3
Q

What is a tool made up of one or two parts?

A

Simple machine

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4
Q

What contains one or more simple machines among its parts?

A

Compound machine

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5
Q

How do machines make work easier?

A

Machines make work easier by either decreasing the force required to do a task or they apply the force over a longer distance.

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6
Q

How does friction affect the work of a machine?

A

Friction uses lubricants.

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7
Q

What is the support of a lever called?

A

Fulcrum

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8
Q

What is the force of an object on a lever?

A

Load

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9
Q

What is a force applied to the end of a lever to lift a load?

A

Effort force

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10
Q

How do first-class, second-class, and third-class levers differ?

A

They differ because of the location of the effort force, fulcrum, and load.

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11
Q

What are the 6 types of simple machines?

A
  1. Inclined plane
  2. Wedge
  3. Screw
  4. Wheel and axle
  5. Pulley
  6. Lever
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12
Q

How are a wedge and screw related to an inclined plane?

A

A wedge is 2 inclined planes put together and a screw is an inclined plane wrapped in a spiral.

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13
Q

What types of simple machines are used in an escalator?

A

Wheel and axle, wedge, pulley, and inclined plane.

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14
Q

How are the fulcrum, effort force, and load related?

A

They are all parts of a lever and can always be in different positions.

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15
Q

How is a screw like an inclined plane?

A

A screw is an inclined plane wrapped in a spiral.

16
Q

How much work is done when a 5N force moves a load 2m?

A

10 J

17
Q

What simple machine do you use when you twist the lid of a pickle jar?

A

Screw

18
Q

What is a block and tackle made from?

A

A series of pulleys

19
Q

What kind of lever has the fulcrum in the middle?

A

First- class

20
Q

What kind of lever has load in the middle?

A

Second-class

21
Q

What kind of lever has the fulcrum at one end, load on the other, and effort force in the middle?

A

Third-class

Science (4 decks)

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