Unit D

Question 1

How many types of simple machines?

Answer 1

6

Question 2

1st class lever?

Answer 2

Fulcrum between load and force

Question 3

teeter totter?

Answer 3

1st class lever

Question 4

3rd class lever?

Answer 4

Effort between load and fulcrum

Question 5

wheel barrow

Answer 5

2nd class lever

Question 6

2nd class lever?

Answer 6

Load between effort and fulcrum

Question 7

Tweezers

Answer 7

3rd class lever

Question 8

Flagpole is an example of ?

Answer 8

machines changing the direction of force

Question 9

Example of transferring force?

Answer 9

Staple remover

Question 10

Group of parts that work together to perform a function?

Answer 10

System

Question 11

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

Answer 11

Gears

Question 12

What part of a bicycle transfers the force?

Answer 12

Chains

Question 13

What part of a bicycle increases the force?

Answer 13

Pedals

Question 14

Linkage of the bike?

Answer 14

Chains

Question 15

Linkage in a car?

Answer 15

Fan belt

Question 16

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

Answer 16

Transmission

Question 17

What is an egg beater an example of?

Answer 17

Changing the direction of motion

Question 18

driving gear?

Answer 18

Gear that has force applied to it from the outside

Question 19

what are multiplying gears?

Answer 19

Gears that increase speed

Question 20

When do multiplying gears occur?

Answer 20

When the driving gear is larger

Question 21

Reducing gears have ______ driving gears

Answer 21

Smaller

Question 22

How quickly and how easily something helps you do work

Answer 22

Efficiency

Question 23

How well a machine does it’s job

Answer 23

Effectiveness

Question 24

No machine is 100% ______

Answer 24

Efficient

Question 25

When was electricity distributed in cities?

Answer 25

1800s

Question 26

When did electricity become widely available?

Answer 26

1940

Question 27

How do machines make work easier?

Answer 27

By increasing the amount of force you exert on an object

Question 28

Amount that machine can multiply a force?

Answer 28

Mechanical advantage

Question 29

MA=?

Answer 29

Output/input force

Question 30

Speed ?

Answer 30

Amount of distance travelled in a given time

Question 31

Speed ratio?

Answer 31

How the speed of the object is affected by a machine

Question 32

SR=?

Answer 32

Input/output distance

Question 33

Force that opposes motion?

Answer 33

Friction

Question 34

efficiency=?

Answer 34

MA/SR x100

Question 35

Typical engine efficiency?

Answer 35

15%

Question 36

W=?

Answer 36

Fx d

Question 37

What is linked to a car transmission?

Answer 37

Pistons

Question 38

P=?

Answer 38

F/a

Question 39

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

Answer 39

Sakia