simple machines

what are input forces

the force applied

what are output forces

• the force which is applied to the task

what is a mechanical advantage

machine takes a small input force and increases the magnitude (size) of the output force

how do you calculate mechanical advantage?

what is a lever

• A lever is a rigid bar that rotates around a fixed point called the fulcrum

• The bar may be straight or curves

• In use, a lever has both an effort (applied) force and a load (resistive) force

what is a 1st class Lever

Resistance/load is closer to the fulcrum vice versa effort is further from the fulcrum

what does 1st flass lever do

multiplies EF and changes it’s direction

what are examples of first class lever

crowbars

scissors

pliers

tinsnips

seesaws

what is a second class lever

the fulurm is at the end of the bar.

resistance force/load is in the middle

effort forces at the opposite end of the fulcrum

what does 2nd lever forces

effort moves more than resistance

multiplier Effort force but does not change direct

what are examples of 2nd class levers

nut crackers

wheel barrows

doors

bottle openers

what is a 3rd class levers?

fulcrum is at the far end

effort force in the moddle

resistance/load at the opposite far end

what are examples of 3rd class levers?

tweezers, hammers, shovels

what do third class levers do?

does not multiply force

resistance moves faster than effort

what is the equation for energy efficiency

how do you calculate forces on wheel and pulies

how do you calculate lever forces

How do you calculate forces of gears

what is a steering whel system in a car

rack and pinion

what system is used in jacks to lift cars

screw gear type1

what system is used to help a crankshaft itès a type of motio

slider crank