chapter6_MCReview - Chapter 6 Work and Energy Practice Conceptual Questions 1 A 50-N object was lifted 2.0 m vertically and is being held there How much

chapter6_MCReview - Chapter 6 Work and Energy Practice...

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Chapter 6 Work and Energy PracticeConceptual Questions1.A 50-N object was lifted 2.0 m vertically and is being held there. How much work is being done in holding the box in this position?A)more than 100 JB)100 JC)less than 100 J, but more than 0 JD)0 J2.If you walk 5.0 m horizontally forward at a constant velocity carrying a 10-N object, the amount of work you do is 3.A container of water is lifted vertically 3.0 m then returned to its original position. If the total weight is 30 N, how much work was done?4.Does the centripetal force acting on an object do work on the object?5.You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.A)Work is + on the way up and + on the way down.B)Work is + on the way up and - on the way down.C)Work is - on the way up and + on the way down.D)Work is - on the way up and - on the way down.6.The area under the curve, on a Force versus position (F vs. x) graph, representsA)work.B)kinetic energy.C)power.D)potential energy.7.On a plot of Force versus position (F vs. x), what represents the work done by the force F?8.If the net work done on an object is positive, then the object's kinetic energy1
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9.If the net work done on an object is negative, then the object's kinetic energy10.A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass?A)25 to 9B)5 to 3C)12.5 to 4.5D)3 to 5
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