work & machines simple machines chapter 4 section 3
TRANSCRIPT
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Work & Machines
Simple Machines
Chapter 4
Section 3
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Simple Machines
• Inclined Plane Family • Lever Family
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Lever Family
• Simple Lever• Pulley• Wheel & Axle
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Levers
• All have a rigid arm that moves on a fulcrum– Wheel barrel– Teeter-totter
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K’NEX Hammer
• Increased di causes increased Fo
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K’NEX Nut Cracker
• Increased di causes increased Fo
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K’NEX Scale Balance
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Pulley
• A modified lever that uses a wheel instead of a fulcrum
• Block & Tackle– Multiple pulleys put
together as a single unit
• Ex. Garage doors
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Wheel & Axel
• A pulley (wheel) connected to a shaft (axle)
• Steering wheel– Bigger = easier
• Screwdriver handle– Thicker = easier
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Inclined Plane Family
• Simple Inclined Plane• Wedge• Screw
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Simple Inclined Plane
• Changes magnitude & direction of the force
• Ramp– Decreases Finput
– Increases dinput
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Wedge
• Two modified incline planes, back-to-back– 1 downward force
• Turns into 2 outward forces
– Blade – Splitting wedge– Nail
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Screw
• An inclined plane wrapped around a cylinder– Screws– Jar lids– Spiral staircase
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Compound Machine
• A machine that combines 2 or more simple machines
• Scissors– Handles
• 2 levers – joined at a common
fulcrum
– Blades• 2 wedges,