Agenda 5/4/12 Assignment Date DL Simple Machines (#38) Remote Review Tues 5/8 Unit 7 Exam Wed 5/9 Parents Signature Thurs 5/10 DL Simple Machines (#38) Classes of Levers (#39) Page #42 together. Homework: Simple Machines Review WS (#43) Test next Wednesday

Simple Machines There are 6 simple machines. They are: Incline Plane Wedge Screw Lever (3 classes of levers) Wheel and Axle Pulley Incline planes: a slanted surface (ramp). Wedge: a moving inclined plane. Screw: a spiral inclined plane

Lever is a bar, board or circle that pivots about a fixed point called a fulcrum First Class Lever: Fulcrum is located in the center between the effort force and resistance force. Second Class Lever: Resistance force is between the fulcrum and the effort force.

Lever is a bar, board or circle that pivots about a fixed point called a fulcrum Third Class Lever: Effort force between the fulcrum and the resistance force.

Simple Machines Wheel and Axle: a lever that rotates on a circle. Pulleys: a lever that rotates around a fixed point with the use of a pulled rope.

Which Simple Machine? Hammer Wrench Wedge Wheel and Axle 1st Class Lever

Which Simple Machine? Flag and Pole Screwdriver Pulley Wedge

Which Simple Machine? Staples Paint roller Wedge Wheel and Axle

Which Simple Machine? Rope and pulley Paintbrush Pulley 1st Class Lever

Which Simple Machine? Ratchet Doorknob Wheel and Axle Wheel and Axle

Which Simple Machine? Saw Light Bulb Screw Wedge

Which Simple Machine? Scissors Seesaw Wedge 1st Class Lever

Which Simple Machine? Drill Bit Crowbar Wedge 1st Class Lever Wedge

Which Simple Machine? Shovel Car Jack Wedge Wheel and Axle 2nd Class Lever

Which Simple Machine? Wheelbarrow Rake Wedge Wheel and Axle 2nd Class Lever 1st Class Lever

Which Simple Machine? Forceps Pliers Wedge 1st Class Lever Wedge

Which Simple Machine? Wheelchair Putty Knife Wedge Wheel and Axle

Which Simple Machine? Ferris Wheel Wheel and Axle