Example 1 A cartload of sand is pulled 5 m across the ground. The tension in the rope is 300 N and directed 30 degrees above the horizontal. How much work is done in pulling the load? - Suppose ?_k = 0.200, how much work is done on the cart by friction?
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There are three forces acting on the sled: the tension in the rope, the weight of the sled, and the frictional force. Show more…
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Additional Problems In Fig. $11-60,$ a constant horizontal force $\vec{F}_{\text { app }}$ of magnitude 12 N is applied to a uniform solid cylinder by fishing line wrapped around the cylinder. The mass of the cylinder is $10 \mathrm{kg},$ its radius is $0.10 \mathrm{m},$ and the cylinder rolls smoothly on the horizontal surface. (a) What is the magnitude of the acceleration of the center of mass of the cylinder? (b) What is the magnitude of the angular acceleration of the cylinder about the center of mass? (c) In unit-vector notation, what is the frictional force acting on the cylinder?
Forces and Kinetic Energy of Rolling In Fig. $11-34,$ a constant horizontal force $\vec{F}_{\text { app }}$ of magnitude 10 $\mathrm{N}$ is applied to a wheel of mass 10 $\mathrm{kg}$ and radius 0.30 $\mathrm{m}$ . The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.60 $\mathrm{m} / \mathrm{s}^{2}$ . (a) In unit-vector notation, what is the frictional force on the wheel? (b) What is the rotational inertia of the wheel about the rotation axis through its center of mass?
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