axle
a shaft on which a wheel rotates
force
(physics) the influence that produces a change in a physical quantity
friction
the resistance encountered when one body is moved in contact with another
inclined plane
a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
Joule
English physicist who established the mechanical theory of heat and discovered the first law of thermodynamics (1818-1889)
lever
a simple machine that gives a mechanical advantage when given a fulcrum
machine
any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
Newton
English mathematician and physicist; remembered for developing the calculus and for his law of gravitation and his three laws of motion (1642-1727)
power
possession of the qualities (especially mental qualities) required to do something or get something done
pulley
a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
ramp
an inclined surface connecting two levels
screw
a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
simple machine
a device for overcoming resistance at one point by applying force at some other point
Watt
Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)
wedge
something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them
wheel
a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
work
activity directed toward making or doing something
