Forces and Motion
What is force?
A push or pull
What is work?
Work is done when a force moves an object over a distance
What is a machine?
Any object that makes work easier
What is a lever?
A bar that turns on a point
What is an inclined plane?
A flat, slanted surface
What are two forces you experience every day?
Gravity and Friction
How is work measured?
By measuring the force applied and the distance the object moves
What is a simple machine?
A machine that makes work easier that has few or no moving parts.
What is a fulcrum?
The point on which a lever turns.
What is a screw?
An inclined plane wrapped around a cylinder
What is friction
The force that resists the movement of objects against each other.
What is the ability to do work called?
Energy
What is the effort in a simple machine?
The force applied to make the machine work.
What are the 3 classes of levers?
First-class, second-class, and third-class.
How is a screw similar to a winding mountain road?
Both follow a spiral pattern to reduce the effort needed
What is gravity
A force that pull objects toward the Earth.
What is the difference between force and work?
Force is the push or pull, while work requires movement of an object by a force.
What is the load in a simple machine?
The weight of the object being moved.
What is a pulley
What is a wedge?
Two inclined planes placed back-to=back used to split or cut objects.
A contact force requires physical touch, while a non-contact force acts at a distance.
What is the difference between force and work?
Force is a push or pull, while work requires movement of an object by force
What do all simple machines have in common?
They make work easier by requiring less force.
How does a simple pulley work?
The effort is applied downward and the load moves up.
How do beavers' teeth act as a simple machine?
They are sharp like wedges to help cut through wood