Simple Machine

SIMPLE MACHINE

INTRODUCTION

LEARNING OUTCOMES  At

the end of the lesson students/you should be able to:  State what a lever can do  Identify the load, force and fulcrum in the lever  Classify lever

LEVER A

simple machine which turns about a fixed point called fulcrum (F) when a force called the effort (E) is applied to overcome a resisting force known as a load (L)  Types of lever: 1) First class lever 2) Second class lever 3) Third class lever

FIRST CLASS LEVER

SECOND CLASS LEVER

THIRD CLASS LEVER

SUMMARY FIRST CLASS LEVER Model Centre position

L Fulcrum

F

SECOND CLASS THIRD CLASS LEVER LEVER E F L Load

Direction in L and E act in the L and E act in which the load (L)same direction opposite and effort (E) act directions Simple explanation

E

F

E

Effort L and E act in opposite directions

To make work A large load can A small load is easier, the be overcome by lifted using a distance between using a small larger effort effort and effort fulcrum should be greater than the distance between the load an fulcrum

L

ACTIVITY  Label

the picture on the worksheet with the effort (E), load (L) and fulcrum (F) correctly.  Then classify the picture into their class lever.

EVALUATION Answer

the question given in 15 minutes.

CONCLUSION Draw

the relative position of the effort (E), load (L) and fulcrum (F).