Levers

Question 1

What are levers?

Answer 1

A mechine that transmits energy from one place to another through a rigid structure rotating around an fixed point.

Question 2

The 3 main elements to a lever?

Answer 2

1. Axis - a pivot point, called the fulcrum.
2. Resistance - the part to be moved
3. Force - the action causing the load to move.

Question 3

What is a First Class Lever?

Answer 3

The axis is between the resistance to be moved and the force used to move it. Eg. a seesaw

Question 4

What is a sporting example for a First Class Lever?

Answer 4

When a athlete throws a javelin, here the elbow joint is the fulcrum, the force is provided by the hand and the resistance by the upper arm.

Question 5

What is a Second Class Lever?

Answer 5

The axis is at the end of the lever and the resistance is between it and the force. Eg. a Wheelbarrow

Question 6

What is a sporting example for a Second Class Lever?

Answer 6

Standing on tiptoe with the fulcrum at the ball of foot. A volley ball player would use this lever system to jump to spike a ball.

Question 7

What is a Third Class Lever?

Answer 7

The axis is at the end of the lever and the force is applied between it and the resistance. Eg bicep curl.
- Most levers in the body fall into this category.

Question 8

What is a sporting example for a Third Class Lever?

Answer 8

Kicking a soccor ball, where the fulcrum is the knee.