BIOMECHANICS: levers in the body (section 2)

Question 1

What is a lever?

Answer 1

a lever is a ridged structure which moves around a fixed point called a fulcrum (lever) when two forces unequal in size are applied

Question 2

what is a lever in a human body?

Answer 2

a bone

Question 3

what is a fulcrum in a human body?

Answer 3

a joint

Question 4

what is a load in a human body?

Answer 4

weight- body or object

Question 5

First class lever

Question 6

second class lever

Question 7

third class lever

Question 8

sporting example of a first class lever

Answer 8

extension at the elbow during an overarm throw or flexion at the neck- when heading a football

Question 9

sporting example of a second class lever

Answer 9

shooting in netball or foot against the block in starting position

Question 10

sporting example of a third class lever

Answer 10

bicep curl- flexion at the elbow

Question 11

what is mechanical advantage?

Answer 11

allows a lever system to move a large load with a relatively small effort. e.g. second class lever at the arm

Question 12

what is mechanical disadvatage?

Answer 12

the effort would need to be considerably bigger than the load in order to create motion. e.g. third class lever

Question 13

table for mechanical advantage