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\f6 of 7 QUESTIONS/ PROBLEMS: 1. In each situation, identify the forces and specify whether the work done by the respective forces is positive, negative or zero. Example: A ball rolls down an inclined plane. Answers: 1) weight of the ball : positive 2) Normal force : zero 3) Frictional force : negative po A physics student stretches a spring. C. A projectile falls toward the surface of Earth. A box is pulled across a rough floor at constant velocity. 57 d. A child pulls a toy across a rough surface causing it to accelerate. 2. Shamcey works as a student assistant in the library. She was asked to transfer the books to a higher shelf. What factors determine the amount of work that she does in transferring the books? 3. An 80-kg physics professor whose part of his daily exercise is walking through the stairs runs up the stairs one morning to catch up with his 7:30 class. It took him 15 s to cover an upward displacement of 25 m. Approximately, what average power did the professor exert while he was running? 4. A 250-N force accelerates a 25.0-kg crate from rest along a horizontal frictionless surface for a distance of 20.0 m as shown in the figure. a. What is the final speed of the crate? b. How much work is done on the crate by the 250-N force? 5. A 50- N force directed at an angle of 370 above the horizontal is used to move a 15-kg crate along a horizontal surface at constant velocity. How much work is done by this force in moving the crate a distance of 25 m? ANSWER TO QUESTIONS/ PROBLEMS: 58