Question
A sled is paled up so the soe of a hill The skeich above indicates the shape of the till. At the top of the hill tdhe sled is released from rest and allowed os coast down the hill At the bottom of the hill the sled has a speed v and a kinetic energy E ithe energy due to the sleds motion). Amsuer the folJowing questions In every raie riction and air resirtance are so small tbey can be ignored The sled is pulled up a steeper hill of the same height as the hiljdescribed above. Hou will be w of the sled at the bottom ef the hill (afer it has slid down) compare to that of the sled at he bontom of che origisal hel? Choose the best answer below A. The spend at the bonom is grearer for the sieeper hill. B The speed at the botnom is the sane for both hills C. The speed at the bonom is greaner for the original hill because the sled travels further D There is not enough inforrmation gives to say which speed at the bottom is faser J. Note of these descripcions is comect. 45. Compare the kinetuc esergy (energy of motion) of the sled ar the botom for the ceiginal hill and the steeper hill in the previous peobiem. Choose the best arswer belou A. The kinetic energy of the sied a: the bottom is greater for the steeper hull. B The kinetic energy of the sled at the bottom is the same for both halls CThe kitets energy a the boom is greacer foe the onginal D. There is not enough informacios gives to say whuch kinetic energy is greater J. None of these descripcicas is comect. 46. The sied is pulled up s higher hill that is less sieep than the onginal hill described before question 44 How does the speed of the sied a de boom of the hill (afier it has slid down) compare to that of the sted at the boaom of dhe criginal hill? A. The spend at the bottom is greater for the higher but less steep hall than for the original. B. The speed af the bottom is the same for both hulls C. The speed at the bottom is greater for the oniginal hill D. There is nor enough information given to say whoch speed at the bottom is faster J. None of these descriptions is correct i6a. Describe in words your reasonitg in reaching your answer to question 46. (Answer on the answer sheet and use as much space as you need) 47. For the higher hill that is less steep, how does the kiretic energy of the sled at the bottom of the hill after it has slid down compare to that of the criginal hull? A. The kinetic esergy of the sled at the botrom is greater for the higher but less steep hial B. The kinetic energy of the sled at the becom is the same for both hills. C. The kinetic energy at the bomom is greater for the original hill D. There is not enough information given to say which kinetic energy is greater J. None of these descriptions is cormect ols for Scienafic Thinking, CSMT, Tats U nce and Motion Concepmial Exaluaton 5 Force and Motion
Explanation / Answer
(44) For same height, both will have same potential energy and hence, they will have same kinetic energy in both cases.
Hence, velocity will be equal for both cases.
(B) is correct option.
(45) As per the reason of (44) KE will be same in both cases.
(B) is correct option.
(46) For more high hill, potential energy initially increases and hence the Kinetic energy down will be higher. Hence, in this case velocity of higher will be high.
(A) is correct choice
(46a) words of (46) are describing this solution
