Simple Machines The mousetrap Game Physics 2-6-08 Simple Machines The mousetrap Game

Wednesday Big ideas: Determine how do simple machines give an advantage to their user Identify the type, class, effort force and resistance force of a machine used

Types of advantage from a simple machine Change in direction More force out of machine than what is put in More displacement related to force

Types of simple machines Inclined plane family Inclined planes Wedges Screw Objects move along plane Lever Family Pulley Wheel and axle Levers Rotation about a pivot

All machines are related to an effort and resistance force Effort force = Resistance force =

Where effort and resistance force are in each type of machine Page from your book

Real life examples Inclined plane Wheel and axle Screw Wedge Pulley

Levers All levers have a pivot point (fulcrum) Are further divided up into classes Classes are based on relative position of Effort force, Resistance force and the fulcrum

1st class lever Fulcrum is located anywhere between the forces Fulcrum does NOT have to be in the middle of board Examples:

2nd class lever The resistance force is between fulcrum and effort force Examples

3rd class lever Effort force is between Resistance force and fulcrum Examples

Game Challenge The Mousetrap Game Composed of a large number of simple machines Everyone will create a list of every simple machine used in the operation of a completed game Rube Goldberg Machine

Columns to be filled out Step number (#) Description of pieces used in step/action Description of simple machine (if lever indicate class type) Description of Effort force Description of Resistance force For levers describe fulcrum

Assignment details List will be due 2/11/08 (next Monday) Be worth at least 25 points Based on completion and accuracy Typed/ organized in sequence