Simple Machines
a flat, sloped surface
inclined plane
force that pulls objects toward earth
gravity
a change in position
motion
When is work done?
when a force moves an object over a distance
Give one example of a lever
hammer, crowbar, wheelbarrow, broom, tweezers, scissors
a wheel with a rod running through it
wheel & axle
force that causes an object to move
effort
the weight of an object being moved
load
the inclined plane part of a screw is called the ____________
thread
Give an example of an inclined plane
slide or ramp,
a bar that turns on a point
lever
force that resists the movement of objects against each other
friction
an object that makes work easier
machine
Both fixed and movable pulleys are used in a _________________
block & tackle
give an example of a wheel & axle
bicycle wheel, wagon wheel, pizza cutter,
a wheel with a groove that can hold a rope
pulley
The point that a lever turns on is called a _______
fulcrum
Give an example of a pulley
water well bucket, sails on a ship, flagpole
an inclined plane wound around an axle
screw