Lloyd Dean

Levers, Resistance & Gravity

AimsBy the end of the lesson you should be able

to:

List the different types of lever

Describe how gravity and resistance can effect exercise

Apply an example from sport to each of the above

http://www.youtube.com/v/F6svFMPSczg&feature=related

A Fatman Introduction

LeversWhat are they?

A long rigid rod that turns about a pivot or fulcrum

What would they be in the body?

Usually a bone (lever) that is turning about a joint (fulcrum)

3 types, arrangement of each part determines lever classification

1st Class LeverFulcrum is between the effort and load

See saw approach

The neck is a typical example

Resistance comes from head, with muscles in the neck giving the effort. Pivot Joint!

2nd Class LeverFulcrum at one end, effort at the other end &load is in between

Wheel Barrow

Standing calf raises in exercise

What impact would a heavier weight have?

3rd Class LeverThe most commonly found in thebody

Fulcrum at one end, lever at the other end and effort in between

Similar to holding bag of sugar

Biceps curl (Think of muscle attachment!)

How can gravity effect this lever?

http://cwx.prenhall.com/bookbind/pubbooks/martinidemo/chapter11/medialib/CH11/fig_html/fig11_2a.html

Task

How Can The Following Exercises Be Made Easier or More Difficult?

When applying your knowledge of levers, how can the exercises be made more difficult or easier? Give two different exercises below and explain how to

make (1) Easier, (2) Harder.

AimsYou should now be able to:

List the different types of lever

Describe how gravity and resistance can effect exercise

Apply an example from sport to each of the above