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How does the acceleration of a cart depend on the net force acing on the cart if the...

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piggy4 | Student, Grade 10 | Honors

Posted October 29, 2011 at 8:01 AM via web

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How does the acceleration of a cart depend on the net force acing on the cart if the total mass is constant?

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jettyz | Student | eNoter

Posted October 29, 2011 at 9:34 AM (Answer #1)

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Given Newton's second law of motion, acceleration and mass are proportional to force.

Thus: Fnet=ma

The net force is mass multiplied by acceleration.

 

If mass is constant, acceleration and net force will increase or decrease proportionally to each other; multiply or divide each by a similar factor.

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mwmovr40 | College Teacher | (Level 1) Associate Educator

Posted October 29, 2011 at 10:46 AM (Answer #2)

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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.

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