Chapter 11: The Lever System and Leverage

Question 1

What is the rigid structure that moves around a fixed point in a lever system?

Answer 1

The lever

Question 2

What is the fixed point called around which a lever moves in a lever system?

Answer 2

Fulcrum

Question 3

What is the force that causes movement in a lever system?

Answer 3

Effort

Question 4

What is the force exerted by muscular contraction?

Answer 4

Effort

Question 5

What is the force that opposes body movement?

Answer 5

Load/Resistance

Question 6

What might the load consist of?

Answer 6

a) the body part you are trying to move

b) the resistance that the body part is trying to overcome

Question 7

What determines whether a lever operates at a mechanical disadvantage or a mechanical advantage?

Answer 7

The relative distance between the fulcrum and the load and the point at which the effort is applied.

Question 8

When the load is closer to the fulcrum, the lever is at a mechanical _____

Answer 8

advantage

Question 9

When the effort is farther from the fulcrum, the lever is at a mechanical _____

Answer 9

advantage

Question 10

When the effort is closer to the fulcrum, the lever is at a mechanical _____

Answer 10

disadvantage

Question 11

When the load is farther from the fulcrum, the lever is at a mechanical _____

Answer 11

disadvantage

Question 12

Chewing with your back teeth is an example of a mechanical ____, whereas chewing with your front teeth is an example of a mechanical _____

Answer 12

a) disadvantage

b) advantage

Question 13

In a mechanical ____, a small effort moves a large load over a ____ distance

Answer 13

advantage

small

Question 14

In a mechanical ____, a large effort moves a small load at a _____ speed

Answer 14

disadvantage

greater

Question 15

in a mechanical disadvantage, a ____ effort moves a ____ load at a greater speed

Answer 15

large

small

Question 16

in a mechanical advantage, a ____ effort moves a ____ load over a small distance

Answer 16

small

large

Question 17

In a first-class lever, the following is true:

a) effort - load - fulcrum
b) fulcrum - effort - load
c) effort - fulcrum - load

Answer 17

EFL

Question 18

In a second-class lever, the following is true:

a) effort - load - fulcrum
b) effort - fulcrum - load
c) fulcrum - effort - load

Answer 18

ELF

Question 19

In a third-class lever, the following is true:

a) fulcrum - effort - load
b) effort - load - fulcrum
c) effort - fulcrum - load

Answer 19

FEL

Question 20

Which type of lever would you see in a seesaw?

Answer 20

first

Question 21

Which type of lever exists in a wheelbarrel?

Answer 21

second

Question 22

First-class levers produce:

a) mechanical advantage
b) mechanical disadvantage
c) neither
d) both a and b

Answer 22

d

Question 23

Second-class levers produce:

a) mechanical advantage
b) mechanical disadvantage
c) neither
d) both a and b

Answer 23

a

Question 24

Third-class levers produce:

a) mechanical advantage
b) mechanical disadvantage
c) neither
d) both a and b

Answer 24

b

Question 25

What determines whether a first class lever will produce a mechanical disadvantage or advantage?

Answer 25

It depends on whether the effort or the load is closer to the fulcrum.
If the effort is closer to the fulcrum (load is further from the fulcrum), the lever is at a mechanical disadvantage.
If the load is closer to the fulcrum (effort is farther from the fulcrum), the lever is at a mechanical advantage.

Question 26

Which type of lever system is most common in the body?

Answer 26

third

Question 27

Which type of lever system is the rarest in the body?

Answer 27

first

Question 28

Which type of level system sacrifices speed and range of movement for force?

Answer 28

second

Question 29

Which lever system produces the most force?

Answer 29

second

Question 30

Which lever system favors speed and range of motion over force?

Answer 30

third

Question 31

Which type of lever would be found in a pair of forceps?

Answer 31

third

Question 32

What type of lever system is found in the flexion of the forearm?
Is this lever at a mechanical advantage or disadvantage?

Answer 32

third

disadvantage

Question 33

What type of lever system is formed when a person stands on their toes?
Is this lever at a mechanical advantage or disadvantage?

Answer 33

second

advantage

Question 34

The head resting on the vertebral column forms which type of lever? Is this lever at a mechanical advantage or disadvantage?

Answer 34

first

advantage