Newton's Second Law
of Motion 

Newton's
second law of motion describes how an object changes velocity when it
is acted upon by an external force. Firstly,
if an object is acted on by an external force its velocity will change,
it will accelerate, in the direction of the force. Thirdly, the change in velocity is inversely proportional to the mass of the object. If the same force pushes on a 10 kg toy truck and a 2 kg toy truck the acceleration of the 2 kg toy truck will be five times greater than the acceleration of the 10 kg toy truck. 

This law can be summarised by the formula F = ma F = force (Newton) 

Continue with F = ma 