Simple Machines
Wheel & Axle
makes work easier by moving objects across distances
Pencil Sharpener
Door Knob
Lever
any tool that pries something loose
Pliers
Scissors
Seasaw
Classes
1st Class
Fulcrum is in the middle of weight and force, load and force moved in opposite direction
2nd Class
Weight is in the middle of fulcrum and force, weight and force moved in the same direction
3rd Class
Force is in the middle of fulcrum and weight, force and weight move at the same direction
Formula
MA = 𝑊/𝐹=(𝐹.𝑎):(𝑊.𝑎)
W x w.a = F x f.a
Device that makes work easier by magnifying or changing the direction of the force.
Lever
Wheel and Axle
Pulley
Inclined Plane
Wedge
Screw
Screw
When you wrap an inclined plane around a cylinder it’s sharp edge becomes another simple tool ; screw
Screw
Bottle Cap
Light Bulbs
Inclined plane
- Inclined plane known as a ramp, a flat supporting surface tilted at an angle with one end higher than the other.
- Used as an aid for raising or lowering a load
Stairs
Slides
Formula
F X l = W X h
Wedge
Instead of using the smooth side of the inclined plane to make work easier
Knife
Axes
Pulley
Fixed Pulley
a fixed pulley has an axle mounted in bearing attached To a supporting structure. Change the direction of the force on a rope or belt that moves along its circumference.
MA=1
Moving Pulley
has an axle in a movable block
MA=2
Compound Pulley
a combination of fixed and a movable pulleys forms a block and tackle
Formula
If the pulley if vertical,you can count the amount
of rope.
If the pulley is sideways, divide the W with
the amount of rope holding the wheel.
(The result is F)
MA=W/F
