Soc 20 Levers

Question 1

What is meant by the term levers

Answer 1

In your body, it refers to a system of muscles and bones working together to bring about movement.

Question 2

What happens to this lever system, during exercise

Answer 2

During exercise, your muslces pull on your bones, which then create movement (the bones), acting as levers.

Question 3

How many components is a lever made up of?

Answer 3

4

Question 4

Name the 4 components of a lever

Answer 4

A Fulcrum
An Effort
A Load
Lever arm

Question 5

Fulcrum (or pivot)

Answer 5

The point around which the lever rotates (joints)

Question 6

Effort

Answer 6

A force applied by the user of the lever system, supplied by your muscles.

Question 7

Lever arm

Answer 7

A rigid bar, such as a bone

Question 8

Load

Answer 8

The force that is applied by the lever system. This load is the object that you want to move (e.g dumbbell with your arm)

Question 9

(Levers) Recall: FLE

Answer 9

Falcrum- First class
Load- Second class
Effort- Third class

All in the middle

Question 10

First class levers

Answer 10

Fulcrum sits in the middle, in between the load and effort. Not many examples- tricep dip. The elbow is the fulcrum which sits between the load (at the hand) and the effort (applied by the triceps)

Question 11

Second class levers

Answer 11

The load sits in the middle, in between the effort and fulcrum. Not many examples- calf raisers. The body wieght (load) sits inbetween the toes and balls of the feet (fulcrum) and the gastrocnemius applies the effort, by pulling on the heel.

Question 12

Third class levers

Answer 12

Effort is apllied in the middle of the lever, inbetween the load and fulcrum. Most types of levers are the third class. Example is biceps curls, where the effort is applied by the biceps, which is inbetween fulcrum (the elbow) and the load (in the hand)

Question 13

Mechanical advantage

Answer 13

Happens when the output of the lever is greater than the input- that's when the load is greater then the effort applied, thereofore getting more than you are putting in. 
Calculation = divide input by output 
First and second class levers work at a mechanical advatnage.

Question 14

Mechanical disadvantage

Answer 14

Happens when the effort and load are both on the same side of the fulcrum but the effort sits closer to the fulcrum then the load (3rd class levers). In this case the input of the leve is greater than the output- force being applied is greater the load, putting more in than you are getting out.