Force and Acceleration - Dynamics

Newton's second law states that: F=ma
where F is the force that acts on an object, m is the mass of the object, and a is the acceleration of the object.
This equation is commonly known as the equation of motion.

However, some objects may have more than one force acting on it. The resultant force will be the vector summation of the individual forces.

Common forces are: weight, friction, spring, and normal.

A free body diagram is useful for showing the forces on an object.


Rectangular Coordinates
Forces on an object can be expressed in i, j, k components.
∑ Fx = max
∑ Fy = may
∑ Fz = maz


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