no desc for you but heres some notes! lever - a solid bar supported at one point fulcrum - the point supporting the lever 3 classes of levers: first-class lever: ex: a pry bar on a can of paint, the fulcrum is the part touching the rim of the can second-class lever: ex: a bottle opener, the fulcrum is at the end of the opener that touches the bottle cap third-class lever: (MA<1) ex: using a garden rake, fulcrum is on your left hand where you hold the top of the rake Ideal Mechanical Advantage of a Lever = length of input armlength of output arm input arm - distance between input force and fulcrum output arm - distance between fulcrum and output force IMA = LinLout pulley - a grooved wheel with a rope/cable looped around it fixed pulleys have an MA of 1 a movable pulley has an MA > 1 IMA of a pulley system = the number of support ropes it has the amount of force that each rope supports = load(N)IMA (num. of support ropes) wheel and axle - an axle attached to a wheel ex: a screwdriver, the handle is the wheel, the shaft (part that screws) is the axle when the input force is on the axle and the output force is on the wheel, MA<1 & IMA<1, force is decreased, and speed & distance are increased Ideal Mechanical Advantage = radius of the axleradius of the wheel IMA = rarw when the output force is on the axle and the input force is on the wheel, MA>1, IMA>1, force is increased, and speed & distance are decreased Ideal Mechanical Advantage = radius of the wheelradius of the axle IMA = rwra inclined plane - a sloped surface that an object can move on force needed to move is reduced, but distance is increased Ideal Mechanical Advantage = length of rampheight of ramp IMA = lh screw - an inclined plane wrapped around a rod ex: a screw, a food jar thread (part where you put the lid) wedge - an inclined plane that goes through an object longer and narrower wedge = greater MA ex: axe
