QUESTION 9Calculate the work done on the suitcase by the normal force. A. 320J B. 0 C. 360J D. 300J

To answer this question, we first need to understand what the normal force is. The normal force is the force exerted by a surface that supports the weight of an object resting on it. It acts perpendicular (or "normal") to the surface. The key thing to remember about the normal force, especially in the context of work, is that it does not do work on the object.

This is because the work done by a force is given by the equation W = Fdcos(θ), where:

• W is the work done by the force,
• F is the magnitude of the force,
• d is the distance over which the force is applied, and
• θ is the angle between the force and the direction of motion.

In the case of the normal force, the force is always perpendicular to the direction of motion. This means that θ is 90 degrees, and cos(90 degrees) = 0. Therefore, the work done by the normal force is always zero, regardless of the magnitude of the force or the distance over which it is applied.

So, the answer to the question "Calculate the work done on the suitcase by the normal force" is B. 0.