Machine Notes

6 Simple Machines 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane

6 Simple Machines 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Screw

6 Simple Machines Inclined Plane Screw Wedge 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Screw Wedge

6 Simple Machines Inclined Plane Wheel & Axle Screw Wedge 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Wheel & Axle Screw Wedge

6 Simple Machines Inclined Plane Wheel & Axle Screw Pulley Wedge 1st CLASS 2nd CLASS 3rd CLASS Inclined Plane Wheel & Axle Screw Pulley Wedge

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

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

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!

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

For WHEEL & AXEL : For WEDGE : For SCREW :

For a REAL MACHINE , the ACTUAL MECHANICAL ADVANTAGE is __________ Efficiency = =

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?

Example 2 What is the force needed to lift the box if the MA 1.75 ? What is the efficiency? 30 N

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?

Example 4 What is the IMA? If the efficiency is 90%, what force is needed to lift the box? 100N