Question

What is that unbalanced force on the marble in the last case? what does this suggest ​

Answer 1

Answer:

The unbalanced forces on the marble in this case are zero. It thus suggests that an unbalanced (external) force is required to change the motion of the marble but no net force is needed to sustain the uniform motion of the marble. In practical situations it is difficult to achieve a zero unbalanced force.

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