As she starts to move upward, the student pushes down on the surface with a force that is greater than her weight. What can you say about the net force on her? A. The net force is zero. B. The net force is directed upward. C. The net force is directed downward

Question

Physics

Kathleen Rich

11 November, 11:05

As she starts to move upward, the student pushes down on the surface with a force that is greater than her weight. What can you say about the net force on her? A. The net force is zero. B. The net force is directed upward. C. The net force is directed downward

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Answers (1)

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Giovanni Valencia · Answer 1

Answer: B. The net force is directed upward

Explanation:

Net Force

If a particle has multiple forces applied to it, then the net force is the (vectorial) sum of all of them. According to first Newton's law, if that force is zero, then the particle will keep moving at the same speed it had before or will remain at rest.

The student pushes down on the surface with a force greater than her weight. It means the force is enough to push her up. The ground returns that force (called Normal force) and as a consequence, there is a net force acting upwards to make the student make the jump out of the ground.

Answer: B. The net force is directed upward