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Science8 > Unit D > Flashcards

Unit D Flashcards

1
Q

How many types of simple machines?

A

6

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2
Q

1st class lever?

A

Fulcrum between load and force

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3
Q

teeter totter?

A

1st class lever

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4
Q

3rd class lever?

A

Effort between load and fulcrum

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5
Q

wheel barrow

A

2nd class lever

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6
Q

2nd class lever?

A

Load between effort and fulcrum

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7
Q

Tweezers

A

3rd class lever

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8
Q

Flagpole is an example of ?

A

machines changing the direction of force

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9
Q

Example of transferring force?

A

Staple remover

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10
Q

Group of parts that work together to perform a function?

A

System

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11
Q

What part of a bicycle reduces the amount of force needed?

A

Gears

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12
Q

What part of a bicycle transfers the force?

A

Chains

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13
Q

What part of a bicycle increases the force?

A

Pedals

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14
Q

Linkage of the bike?

A

Chains

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15
Q

Linkage in a car?

A

Fan belt

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16
Q

________ allows the operator to apply a large force to move objects slowly or small force to move them fast

A

Transmission

17
Q

What is an egg beater an example of?

A

Changing the direction of motion

18
Q

driving gear?

A

Gear that has force applied to it from the outside

19
Q

what are multiplying gears?

A

Gears that increase speed

20
Q

When do multiplying gears occur?

A

When the driving gear is larger

21
Q

Reducing gears have ______ driving gears

A

Smaller

22
Q

How quickly and how easily something helps you do work

A

Efficiency

23
Q

How well a machine does it’s job

A

Effectiveness

24
Q

No machine is 100% ______

A

Efficient

25
Q

When was electricity distributed in cities?

A

1800s

26
Q

When did electricity become widely available?

A

1940

27
Q

How do machines make work easier?

A

By increasing the amount of force you exert on an object

28
Q

Amount that machine can multiply a force?

A

Mechanical advantage

29
Q

MA=?

A

Output/input force

30
Q

Speed ?

A

Amount of distance travelled in a given time

31
Q

Speed ratio?

A

How the speed of the object is affected by a machine

32
Q

SR=?

A

Input/output distance

33
Q

Force that opposes motion?

A

Friction

34
Q

efficiency=?

A

MA/SR x100

35
Q

Typical engine efficiency?

A

15%

36
Q

W=?

A

Fx d

37
Q

What is linked to a car transmission?

A

Pistons

38
Q

P=?

A

F/a

39
Q

Old wheel used to raise water into tanks? Persians invented it.

A

Sakia

Science8 (5 decks)

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