Lever Systems

Question 1

First class lever:
• order of components
• example in the body

Answer 1

• EFL or LFE
• extension of the neck when preparing to head a football

Question 2

Second class lever:
• order of components
• example in the body

Answer 2

• ELF or FLE
• ball of the foot in the take-off phase of a high jump

Question 3

Third class lever:
• order of components
• example in the body

Answer 3

• FEL or LEF
• flexion of the elbow during a bicep curl

Question 4

Explain mechanical advantage

Answer 4

Second class lever systems where the effort arm is greater than the load arm. A large load can be moved with a relatively small effort

Question 5

Explain mechanical disadvantage

Answer 5

Third class lever systems where the load arm is greater than the effort arm. A large effort is required to move a relatively small load