Forces and Newton`s First Law

Force: a push or pull exerted by one object on another.

Friction: A force that opposes the motion in contact

with a surface.

Drag force: A force that opposes the motionof an object through a liquid or gas.

Gravity: a force of attraction that exist between 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 a single object.

Unbalanced forces:Forces that do not cancel each other out when acting together on a single object.

Inertia:The tendency of an object to oppose a change in motion.

Momentum:The mass of an object multiplied by its  velocity.