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This consists of two circular objects of different sizes. It makes work easier because it applies more force or lifts a heavy load.
An inclined plane makes work easier because it's easier to move something to a higher or lower place.
Inertia
Newton's First Law - Objects at rest stay at rest and objects in motion stay in motion.
Friction
A force that opposes
motion.
An unbalanced force
acts on an object
causing it to be
in motion.
A balance force acts on an object causing it to be at rest.
Forces
A force is a push or a pull. There is a pushing force and a pulling force.
Lever
Screw
A bar resting on a pivot that is used to help move a heavy load.
Pulley
A screw is an incline plane wrapped around a cylinder with a wedge at the top. A screw makes work easier by holding things together.
A pulley needs a rope, chain, or belt around the groove to make it do work. A Pulley makes work easier by changing the direction of the force or multiplying the effort used
A wedge makes work easier because when moved a wedge cuts, splits, or pries apart objects.
Simple Machines help to reduce the amount of force a person must do to work.
What is work?
It is applying a force to an object in order to move it a distance.