The F in Newton's second law refers to the net force acting on an object. |
The result is to generate a net force that tends to straighten out the curve into a cylindrical tube. |
The net forces acting on each column are summed to derive the net force and torque acting on the assemblage of columns. |
The farther away a quark moves, the more gluons appear, each contributing to the net force. |
In reality, the magnetic field felt by a compass needle is essentially uniform over the length of a compass needle and as a result the net force on the needle is zero. |
Conversely, if a body is not accelerated, there is no net force acting on it. |