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In physics, dynamics is the study of forces (why objects move). When studying dynamics, vectors are used to describe forces.

Newton's Laws Newton described force as the ability to cause a mass to accelerate.

  • Newton's first law states that an object in motion will stay in motion unless a force is applied.
  • Newton's second law states that Force Quantity is equal to mass multiplied by the acceleration (F=ma).
  • Newton's third law states that for every action, there is an equal but opposite reaction.
  • Newton's first law deals with inertia. Inertia is a property of matter that resists acceleration and depends only on mass.


  • Forces cause acceleration and have the ability to cause acceleration.
  • If an object is accelerating, the Net Force is not zero.
  • To find the Net Force, take the vector sum of all component forces
  • To find the acceleration, use the equation Fnet=ma.
  • If forces act at angles, trigonometry is needed to solve. [Fx=Fcos(0)] [Fy=Fsin(0)]
  • If forces act along the axes, no trigonometry is needed to solve.



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