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18 terms

Simple Machines

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Simple Machine
A machine with few moving parts, making it easier to do work.
Work
The use of force to move an object.
Fulcrum
The fixed point on which a lever balances.
Force/Effort
A push or pull by one object on another, causes a change in motion.
Lever
A stiff bar that balances on a fulcrum.
Examples of Levers
Seesaw (1st)
Wheelbarrow (2nd)
Tweezers (3rd)
Wheel and Axle
A large wheel that rotates on a small rod.
Examples of a Wheel and Axle
Doorknob, car wheels
Pulley
A wheel with a groove in the rim and a rope, allowing the load to be lifted.
Examples of Pulleys
Flagpoles, blinds
Inclined Plane
A flat, slanted surface that allows heavy objects to be moved easily.
Examples of Inclined Planes
Bottom of a sink or bathtub
Ramps
Stairs
Ladder (leaned against a wall)
Wedge
two inclined planes put together back to back that are used for separating things
Examples of Wedges
Knife
Ax blade
Fork
Screw
An inclined plane wrapped around a cylinder or cone that is used to fasten. The spiraled inclined plane is called "threads"
Examples of screws
Jar lids
Bolts/screws
Gears
Used to transfer motion from one part of a machine to another. The teeth push them in opposite directions.
Examples of gears
Gears next to a bike pedal
Clocks