Written by Jerry Ratzlaff on . Posted in Classical Mechanics

force bannerForce is the push or pull of an object resulting in a change from rest or motion.  So when you apply force to an object the velocity changes, the change in velocity is acceleration.  Force is a vector quantity having magnitude and direction, some of these include acceleration, displacement, drag, lift, momentum, thrust, torque, velocity, and weight.

Contact Forces

  • Frictional force
  • Tensional force
  • Normal force
  • Air Resistance force
  • Applied force
  • Spring force

Action at a distance Forces

  • Gravitational force
  • Electrical force
  • Magnetic force

Force Formula



Equation 1:

\(\large{ F = ma }\)

Equation 2:

\(\large{ F = p A }\)        


\(\large{ F }\) = force

\(\large{ m }\) = mass

\(\large{ a }\) = acceleration

\(\large{ A }\) = area

\(\large{ p }\) = pressure


force appliedApplied Force

Applied force ( \(F_a\) ) can come from different types of forces, one of them could be Newton's Second Law.  There really is no single formula.






Centrifugal Force

Centrifugal force is when a force pushes away from the center of a circle, but this does not really exist.  When an object travels in a circle, the object always wants to go straight, but the centripetal force keeps the object traveling along an axis of rotation.

Concurrent Force

All of the forces act at the same point.

General Three-dimensional Force

All other combinations of nonconcurrent, nonparallel and noncoplanar forces.

Parallel Force

All the forces are parallel (not necessarily in the same direction)

Tags: Equations for Force