Levers: pg. 59

Question 1

What is a first-class lever?

Answer 1

A first-class lever is a type of lever where the fulcrum is in the middle positioned between the load and effort.

Question 2

Give an example of a first-class lever.

Answer 2

See-saw

Question 3

What is mechanical advantage?

Answer 3

Mechanical advantage (MA) is the force amplifying the effectiveness of a simple machine.

Question 4

What is a load?

Answer 4

A load is the weight of the force being applied by a lever.

Question 5

What is effort?

Answer 5

Effort is a vigorous or determined attempt.

Question 6

What is a fulcrum?

Answer 6

A fulcrum or pivot is the point which the effort and load rotate on.

Question 7

What is a second-class lever?

Answer 7

A second-class lever is a type of lever where the load is positioned between the fulcrum and the effort.

Question 8

Give an example of a second-class lever.

Answer 8

Nutcracker.

Question 9

What is MA < 1?

Answer 9

MA < 1 means that the mechanical advantage of the lever is smaller than 1, that it is a mechanical disadvantage.

Question 10

What is MA > 1?

Answer 10

MA > 1 means that the mechanical advantage is greater than 1.

Question 11

What is MA = 1?

Answer 11

MA = 1 means that the mechanical advantage is equal to 1, that is does not have a mechanical advantage.

Question 12

What is a third-class lever?

Answer 12

A third-class lever is a type of lever where the effort is positioned between the load and the fulcrum.

Question 13

Give an example of a third-class lever.

Answer 13

A human forearm.

Question 14

First-class levers give:
A. MA < 1
B. MA > 1
C. MA = 1
D. All of the above.

Answer 14

D. All of the above.

Question 15

Second-class levers give:
A. MA < 1
B. MA > 1
C. MA = 1
D. All of the above.

Answer 15

B. MA > 1

Question 16

Third-class levers give:
A. MA < 1
B. MA > 1
C. MA = 1
D. All of the above.

Answer 16

A. MA < 1