how levers work

simple machine: a device with few parts that makes it easier to do work

effort force: the force applied to do a machine

resistance force: the force that a machine acts again

lever: a simple machine made of a rigid bar on a pivot point

fulcrom: the pivot point of a lever

mechanical advantage: the number of times a machine multiplies the force applied

pulley: a groove wheel that turns by the action of a rope in the groove

wheel and axle: a simple machine made of a handle or axis attached to the center of a wheel

Energy and Work

potential energy: the energy stored in an object or materials

gravitational potential energy: the potential energy of an object located above the ground

work: force applied to an object times the distance the object moves

Forces and Newton`s first law

force: a push or pull exerted by one object or another

Friction: a force that opposes the motion of an object in contact with a surface

drag force: a force that opposes the motion of an object through a liquid or gas

gravity: a force of attraction that exists with all objects with mass

net force: the combined effect of all the forces acting on an object

balanced forces: forces that cancel each other out when acting together on an single object

unbalanced forces: forces that do not cancel each other out when acting together on a single javascript:void(0)object

inertia: the tendency of an object to oppose a change in motion

momentum: the mass of an object multiplied by its mass