1. Sum of forces is zero <=> velocity remains constant.[If the particle is initially at rest, it will remain at rest for as long as the sum of the forces is zero].

2. Sum F of forces is proportional to the rate of change of momentum.

F = k x d(mV)/dt

F = d(mV)/dt (in suitable units)

If the mass m is constant, 

F = mdV/dt = ma

3.Forces always occur in equal and opposite pairs. (To every action, there is an equal-and-opposite reaction.) 

Posted Date: 8/27/2012 7:16:11 AM | Location : United States

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