Question

If a body is not in rest position, then the net external force on it cannot be zero. Is this statement True or False?
A. True
B. False

Answer 1

Hint: The foundation of mechanics is Newton's three laws of physics.According to the first law, a body at rest will remain at rest unless acted on by a net external force, and a body in motion will remain in motion at a constant velocity until acted on by a net external force.

Complete answer:
The foundation of mechanics is Newton's three laws of physics. According to the first law, a body at rest will remain at rest unless acted on by a net external force, and a body in motion will remain in motion at a constant velocity until acted on by a net external force.

The sum of all external forces acting on an object is known as net external force. The presence of forces acting on an object does not always imply the presence of a net external force; forces of equal magnitude acting in opposite directions will cancel each other out.

Newton's first law of motion states that any object travelling at constant velocity experiences no net external force, implying that the number of the forces acting on the object must be negative. F net = 0 is a mathematical expression for no net external force acting on an entity.It's possible that the Body moves at a steady speed. The net external force is therefore zero in this situation, and the body is not at rest.

Hence, option B is the correct answer.

Note:The foundation of mechanics is Newton's three laws of physics. According to the first law, a body at rest will remain at rest unless acted on by a net external force, and a body in motion will remain in motion at a constant velocity until acted on by a net external force.