Soc20 Levers

Question 1

What are the: 1st class

Answer 1

• 1st class is the - effort (muscle), fulcrum (neck) and load (head)
• An example is the head being raised

Question 2

What is the: 2nd class

Answer 2

• 2nd class, is the - fulcrum (ball of the foot), load (the weight of person), effort (calf muscle/gastronemius)
• An example is the ankle joint to plantar flexion (point toes)

Question 3

What is the: 3rd class

Answer 3

• 3rd class, is: fulcrum (elbow joint), effort (bicep pull) and load (hand)
• An example is seen in the elbow joint (hinge) flextion & antiflextion)

Question 4

The distance btween effort and fulcrum

Answer 4

• The distence between effort (muscle) and the fulrum (joint), is called ‘effort arm’
  Mechanical advatage = effort arm divided by the resistance arm

Question 5

Distance between resistance and fulcrum

Answer 5

• The distance between, resistance (load that needs moving) and the fulcrum (joint)
• Distance is called ‘resistance arm’
• Mechanicla advantage = effort arm divided by the resistance arm

Question 6

What type of lever is appropriate for doing heavy weights?

Answer 6

Short resistance arm

Question 7

What type of levers have a mechanical advantage of 1

Answer 7

First-class & third-class

Question 8

For which activity is a second-class lever ideal for

Answer 8

Lifting heavy weights