Simple Machines Rube Goldberg Project.

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Presentation transcript:

Simple Machines Rube Goldberg Project

Simple Machines #1 Inclined Plane Reduces Force Increases Distance Examples Wheel Chair Ramp Loader for truck

Simple Machine #2 Wedge #3 Screw Two inclined planes pushed together Lessens force by increasing distance #3 Screw Inclined plane wrapped around a cylinder Lessens force by increasing distance

Simple Machines #4 Lever Beam or stick that pivots or rotates on a fulcrum Fulcrum is the stationary part of a lever Three classes of levers

Simple Machines #5 Wheel & Axle #6 Pulley Wheel attached to a smaller axle in which a force is transferred #6 Pulley A rope or string that uses a central wheel to rotate

Mechanical Advantage The amount a machine reduces force Output Force divided by Input Force (Load divided by Effort) No units

How to make things easier Incline Plane & Wedge Lengthen the ramp and lower the angle Screw Lower the incline (edges closer together) Lever More distance from effort to fulcrum than load to fulcrum Wheel and Axle Increase the ratio of wheel diameter to axle diameter Pulley Add more wheels You will have to pull more rope but it will be easier https://www.youtube.com/watch?v=sOnVFR1msPk

Catapult & Rube Goldberg Project Who was Rube Goldberg? Cartoonist/Inventor Term used for making a simple task more complex

Passing man (A) slips on banana peel (B) causing him to fall on rake (C). As handle of rake rises it throws horseshoe (D) onto rope (E) which sags, thereby tilting sprinkling can (F). Water (G) saturates mop (H). Pickle terrier (I) thinks it is raining, gets up to run into house and upsets sign (J) throwing it against non-tipping cigar ash receiver (K) which causes it to swing back and forth and swish the mop against window pane, wiping it clean. If man breaks his neck by fall move away before cop arrives. http://maroonssoftball.tripod.com/simplemachines/id2.html

Videos https://www.youtube.com/watch?v=_ve4M4UsJQo&list=PLD9LkBjB24UNlBiyNyOwPr7aWIKcmQo8y https://www.youtube.com/watch?v=6FzUx2EFk8s