5.2 levers

Question 1

3 components of a lever

Answer 1

• Fulcrum
• Resistance
• Effort

Question 2

Describe first class lever and example in human body

Answer 2

Fulcrum located in the middle. Extension at elbow. Flexion or ectention at neck

Question 3

Describe second class lever and example in human body

Answer 3

Resistance in the middle. Plantar flexion at ankle

Question 4

Describe second class lever and example in human body

Answer 4

Effort in the middle. Flexion at elbow, knee and hip.

Question 5

Mechanical advantage calculation

Answer 5

Effort arm divided by resistance arm

Question 6

Mechanical advantage of first and third class lever

Answer 6

Large range of movement
Resistance moved quickly

Question 7

Mechanical disadvantage of first and third class lever

Answer 7

Can’t apply much force to move an object

Question 8

Mechanical advantage of second class lever

Answer 8

Can generate much larger forces
Can lift whole body weight

Question 9

Mechanical disadvantage of second class levers

Answer 9

Slow
Limited range of movement