#8 2. Consider the force F shown in the drawing. This force acts on an object th
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#8
2. Consider the force F shown in the drawing. This force acts on an object that can move along the F positive or negative x axis, or along the positive or negative y axis. The work done by this force is positive when the displacement of the object is along the axis: (a)-x, -y (b)-x, +y (c) +x, +y circular pat What enabl is above po by the tens energy gravitation axis or along the Section 6 and the V 21. In wh conservat force acts Section 6.2 The WorkEnergy Theorem and Kinetic Energy 8. Two forces F, and F, act on a particle. As a result the speed of the par- in the san ticle increases. Which one of the following is NOT possible? (a) The work done by Fi is positive, and the work done by e zero. (b) The work done by F, is zero, and the work done by Ec. itive. (c) The work done by each force is positive. (d) The work done conservat object. the displa compone by each force is negative. (e) The work done by F',is positive, and theobiec work done by F2 is negative. 9. Force F, acts on a particle and does work Wi. Force F, acts simul- taneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? (a) W, is ero and W2 is positive (b) W,W (c) Wi is positive and W2 is opposite 22. A 92 through a stant. Wh which isExplanation / Answer
an incresing speed of the particle means increases in the kinetic energy that also imply particle imparted enegy to both of the forces that also mean that net work done on the particle is positive. that is option (B) is correct.
also if both forces is negative, then the net work is negative and the KE will decrease
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