Initially, Newton defined his second law of motion in terms of the rate of change in an object's momentum:

(Pf -Pi)/t = Fnet

Subsequently he developed the concept further to

(mVf - mVi)/t = Fnet or m(Vf - Vi)/t = Fnet

So, (Vf - Vi)/t = Fnet/m

by defining the rate of change in the velocity as acceleration we get the current form of the second law:

a = Fnet/m

From this we can see that if m is constant then a is directly proportional to Fnet. Increasing Fnet causes an increase in the acceleration.

## We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

- 30,000+ book summaries
- 20% study tools discount
- Ad-free content
- PDF downloads
- 300,000+ answers
- 5-star customer support

Already a member? Log in here.

Are you a teacher? Sign up now