lever
when was the lever invented
3rd century BC
when was the inclined plane invented
2600 BC
when was the wheel invented
3500BC
when was the screw invented
400bc
when was the pulley invented
1500 BC
whats a first class lever
A seesaw
what are some examples of a inclined plane
Roller coaster, skateboard ramp, playground slide, water slide
where did the wheel first appear
in ancient Mesopotamia aka present day Iraq 5,000 years ago
what were screws first used for
wine presses, olive oil presses, and pressing clothes
what are the different types of pulleys
fixed moveable and compound
whats a second class lever
bottle opener, nutcracker, wheelbarrow
you can use a inclined plane to do what
to move an object up or down
what were the first wheels made out of
wooden disks and holes for axles
what is the function of the screw
A screw is a mechanism that converts rotational motion to linear motion, and a torque rotational force to a linear force
how does a pulley work
if you have a single wheel and a rope, a pulley helps you reverse the direction of your lifting force
whats a third class lever
tongs, stapler, door hinge
it can also be used for what
to lift an object to a higher spot with less force
wheels helped in what
farming and making cloths
what type of machine is a screw
simple machine
what are some examples of present day pulleys
elevators wells exercise machines thereater machines and constuction pulleys
THe longer the lever
the higher the object goes
an inclined plane is what type of machine
simple machine
how does a wheel work
Wheels reduce friction. Instead of simply sliding over the ground, the wheels dig in and rotate, turning around sturdy rods called axles. Wheels provide leverage
how does the screw make work easier
Because work is defined as force acting on an object in the direction of motion
what type of machine is a pulley
a simple machine