Force and Newton's Fist Law

• 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.