A force is a push or pull that can cause an object with mass to accelerate. In other words, force applied on an object will make its velocity to change. It is the product of mass and acceleration expressed in Newton(N). Here is a simple force formula to calculate force applied with mass and acceleration. Formulas to find mass and acceleration with force is also listed over here. An object with force is equal to the mass of the object multiplied by the acceleration of the object.