Asked by Benji
Based on the third law motion of equal and opposite forces, a mass should never accelerate because the net force on it will always be zero. Resolve the issue.
would F=ma answer this question?
If a force is exerted by object A on object B, then B exerts a force of equal magnitude and in opposite direction on A. So, there is then a net force on A causing A to accelrate. But B accelerates in the opposite direction.
But the center of mass of A and B does not accelerate, because the total force exerted on the combined system A plus B is zero.
Try to solve this problem by making clever use of Newton's third Law:
Given a sphere of uniform density rho and radius R, what is the gravitatonal force that one half of the sphere exerts on the other half?
would F=ma answer this question?
If a force is exerted by object A on object B, then B exerts a force of equal magnitude and in opposite direction on A. So, there is then a net force on A causing A to accelrate. But B accelerates in the opposite direction.
But the center of mass of A and B does not accelerate, because the total force exerted on the combined system A plus B is zero.
Try to solve this problem by making clever use of Newton's third Law:
Given a sphere of uniform density rho and radius R, what is the gravitatonal force that one half of the sphere exerts on the other half?
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