Q6_7B_W10_Rubric

# Q6_7B_W10_Rubric - Name Rubric Last First DL Section Office...

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Name: Rubric , DL Section: Last First Office Use Quiz 6 Physics 7B Winter 2010 Feb. 17, 2010 Two figure skaters, a 75 kg man and a 50 kg woman, are standing on the ice. To keep the numerical calculations simple, assume that g = 10 m/s 2 . a) We will start by neglecting the effect of the friction between the skate blades and the surface of the ice. The woman pushes on the man with a force of 25 N. Determine magnitude and direction the accelerations of the man and the woman. From Newton’s third law we know that the Force that the man exerts on the woman is equal and opposite the force that the woman exerts on the man. We also know that the normal force that each experiences is equal and opposite to the force of gravity on each. To get the accelerations, we use Newton’s second law, F = m a . F man = 25 N = m a man a man = (25 N)/(75 kg) = 0.33 m/s 2 to the left. F woman = 25 N = m a woman a woman = (25 N)/(50 kg) = 0.50 m/s 2 to the right. J (10) - All correct K (9) - Minor error - algebra, units, sign, etc L (7) - Wrong direction or one missing M (6) - Both directions missing or wrong P (6) – One acceleration wrong

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Q6_7B_W10_Rubric - Name Rubric Last First DL Section Office...

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