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Machine Notes
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6 Simple Machines 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane
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6 Simple Machines 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Screw
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6 Simple Machines Inclined Plane Screw Wedge
1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Screw Wedge
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6 Simple Machines Inclined Plane Wheel & Axle Screw Wedge
1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Wheel & Axle Screw Wedge
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6 Simple Machines Inclined Plane Wheel & Axle Screw Pulley Wedge
1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Wheel & Axle Screw Pulley Wedge
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6 Simple Machines Inclined Plane Wheel & Axle Screw Pulley Wedge Lever
1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Wheel & Axle Screw Pulley Wedge Lever
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SIZE DIRECTION Machines can change the __________, _____________, and/or ______________ of force. SPEED Machines can not “create ___________ or do more work than the user does ENERGY Less force More distance More force less distance
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IDEAL MACHINES : F Do not dissipate (lose) energy to __________, __________, or_________ FRICTION HEAT SOUND F WORK IN = WORK OUT ( )( ) = ( )( ) F FE dE FR dR F Do not exist!
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d IMA = d Can calculate for ANY machine – doesn’t have to be an
effort Can calculate for ANY machine – doesn’t have to be an ideal machine d resistance For INCLINED PLANE: For LEVER : Distance is measured FROM THE For PULLEY : ____ - how far you pull rope ____ - how far the object moves OR
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For WHEEL & AXEL : For WEDGE : For SCREW :
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For a REAL MACHINE , the ACTUAL MECHANICAL ADVANTAGE is __________
Efficiency = =
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Example 1 20 N What is the IMA? What is the actual MA if you must push with 10 N to lift the box? What is the efficiency?
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Example 2 What is the force needed to lift the box if the MA 1.75 ?
What is the efficiency? 30 N
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Example 3 20 N What is the IMA of the ramp?
What is the efficiency if it takes 8.0 N to push the box up the ramp?
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Example 4 What is the IMA? If the efficiency is 90%, what force is needed to lift the box? 100N
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