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Unformatted text preview: a ball straight up into the air. In addition to gravity, the ball feels a force due to air resistance. Compared to the time it takes the ball to go up, the time it takes to come back down is: 1) smaller 2) the same 3) greater Due to air friction, the ball is continuously losing mechanical energy. Therefore it has less KE (and energy consequently a lower speed) on the way down. This speed means it will take more time on the way down !! Followup: How does the force of air resistance compare to gravity when the ball reaches terminal velocity? ConcepTest 8.11a Time for Work I
Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work? 1) Mike 2) Joe 3) both did the same work ConcepTest 8.11a Time for Work I
Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work? 1) Mike 2) Joe 3) both did the same work Both exerted the same force over the same displacement. Therefore, both did the same di...
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This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.
 Fall '07
 Mueller
 Physics, Energy, Potential Energy

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