A person says that she climbed over a fence by pulling herself over it. Using Newton's third law of motion, explain how she actually moved over the fence
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Under the influence of its drive force, a snowmobile is moving at a constant velocity along a horizontal patch of snow. When the drive force is shut off, the snowmobile coasts to a halt. (a) During the coasting phase, what is the net external force acting on the snowmobile? (b) How does the work done by the net external force depend on the magnitude and direction of the net force and on the displacement of the snowmobile? (c) What is the net force acting on the snowmobile during the constantvelocity phase? Explain. (d) The work-energy theorem is given by (Equation 6.3 ), where is the work done by the net external force acting on the snowmobile, is its mass, and and are, respectively, its final and initial speeds. Suppose the net external force, and and are known. By using only the work-energy theorem, can one determine the time it takes for the snowmobile to coast to a halt?
The snowmobile and its rider have a mass of . Under the influence of a drive force of , it is moving at a constant velocity, whose magnitude is . Its drive force is shut off. Find (a) the distance in which the snowmobile coasts to a halt and (b) the time required to do so.
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