2.1 Levers

Question 1

What is a lever system?

Answer 1

A rigid bar that moves around a fixed fulcrum with two forces applied to it.

Levers can change size or direction of the effort used to make a task more manageable

Question 2

What are the 3 key elements of levers?

Answer 2

Fulcrum
Effort
Load

Question 3

What is a lever?

Answer 3

A rigid bar or object that moves around a fixed fulcrum with two forces applied to it

Question 4

What is the fulcrum?

Answer 4

A fixed pivot point
E.g. joint

Question 5

What is the effort?

Answer 5

The source of the energy
E.g. muscle

Question 6

What is the load?

Answer 6

The weight/resistance to be moved.
E.g. a body part

Question 7

What is the first class lever system?

Answer 7

When the fulcrum is in the middle
E.g. see-saw
E.g. Nodding head forward, muscles at back of the neck, load front of the skull, fulcrum in between

Question 8

What is the second class lever system?

Answer 8

When the load is in the middle
E.g. wheel barrow
E.g. plantar Flexion, fulcrum at the toes, load on the middle of the foot, effort in the calf

Question 9

What is the third class lever system?

Answer 9

When the effort is in the middle
E.g. fishing rod
E.g. bicep curl, load at the hand, effort on the radius/ulna where the tendon attaches to bicep, fulcrum at the elbow