# F a four times as long b twice as long c the same

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Unformatted text preview: experiment is repeated is twice the amount of the first time, and since the force is half as big, when you solve for dt it will be 4 times as big as the initial experiment. P Ft mV Ft B) Mass does not matter, only the force. C) The forces and the mass canceled out mV t F Physics 211 Lecture 13, Slide 15 Physics Preflight Identical balls are dropped from the same initial height and bounce back to half the initial height. In Case 1 the ball bounces off a cement floor and in case 2 the ball bounces off a piece of stretchy rubber. In which case is the average force acting on the ball during the collision the biggest? A) Case 1 B) Case 2 C) Same in both cases Only 59% got this right – Lets try it again ! Case 1 Case 2 Physics 211 Lecture 13, Slide 16 Physics …In which case is the average force acting on the ball during the collision the biggest? A) Case 1 B) Case 2 C) Same in both cases Case 1 Case 2 A) the force on the ball depends on the time it is in contact with the floor. since it is much less in case 1, then the force is much larger B) its in contact with the ball for longer P Fave t C) If both balls reach the same height the impulse will be the same because they both leave with the same speed. Physics 211 Lecture 13, Slide 17 Physics Egg Throwing Video & Demo HW Problem with demo HW (From the previous page) Demo – similar concept Demo p m v f vi t time between bounces H Fave h vi vf scale vi 2 gH v f 2 gh p t = reading on scale...
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