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Block and Tackle:
A pulley system that uses more than one pulley.
Crane:
A machine used to hoist heavy objects.
Effort:
The use of physical energy to do something.
Elevator:
A platform or small room that can be raised or lowered in a vertical
shaft to carry people or goods from one level to another.
Friction:
The resistance to motion created when an object is rubbed against another.
Fulcrum:
The point on which a lever turns.
Gear:
A wheel with teeth that fit into the teeth of another wheel.
Invention:
An original device, system or process.
Lever:
A simple machine for lifting a weight. It usually consists of a strong,
rigid bar that rests on a fixed point on which it turns.
Load:
Something that is carried, lifted or supported.
Machine:
A combination of mechanical parts that operate together to perform a task.
Newton:
The force needed to accelerate a mass of 1 kilogram by 1 meter per
second every second.
Pulley:
A freely turning wheel that has a groove around its edge through which a
rope, chain or belt moves.
Windmill:
A machine that uses the power of the wind hitting a set of vanes to turn
a wheel. |