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P2207_lecture_questions_force_fall2008

P2207_lecture_questions_force_fall2008 - Overhead views of...

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1 Overhead views of a block that lies on a frictionless floor are shown below. If the force magnitudes are chosen properly, in which situations is it possible that the block is either stationary or moving with constant velocity? F 1 (1) (3) (4) (2) F 1 F 1 F 2 F 2 F 3 F 1 F 2 F 3 F 2 A. (2) and (3) B. (2) and (4) C. (2), (3), and (4) D. All four Do stop pulling the cat's tail, Darling.“ "I'm not pulling Mummy, Kitty's pulling!" How does the magnitude of the force that Darling the daughter exerts on Kitty the cat compare with the force that Kitty exerts on Darling? A. F Darling on Kitty > F Kitty on Darling B. F Darling on Kitty = F Kitty on Darling C. F Darling on Kitty < F Kitty on Darling m Which of the following forces are 3rd-law interaction pairs? A. Weight W of mass m and tension T of rope B. W and gravitational force of mass m on earth C. Tension T and force of mass m on rope D. Two of the above E. Three of the above m F=mg a a=? A. 0 B. g C. >g D. insufficient information
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2 m F a=g F=? A. 0 B. mg C. 2mg D. 3mg m m m 3 1 2 T 1 / T 3 =? A. 1/3 B. 1/2 C. 1 D. 2 E. 3 m 1 m 2 frictionless pulley a a=? A. 0 B. g C. m 1 g / (m 1 + m 2 ) D. m 2 g / (m 1 + m 2 ) E. (m 1 - m 2 ) g / (m 1 + m 2 ) m θ θ T T T=? A. mg B. mg /sin( θ ) C. mg / cos( θ ) D. mg / 2 sin( θ ) E. mg / 2 cos( θ )
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3 m θ θ T T T ? A. 0 B. mg / 2 C. mg D. 2mg E. As θ→ θ→θ→ 0 (i.e., the ropes approach horizontal), T ? W N T W x W y θ W x =? A. W cos θ B. W sin θ C. W tan θ D. W / cos θ E. W / sin θ r o p e What is the average angle θ of Buffalo St. between Eddy and Aurora Sts.? Aurora St. θ Eddy St. A. ~5 ° B. ~10 ° C. ~20 ° D. ~30 ° E. ~45 ° What is the acceleration of a cyclist if he coasts without pedaling down Buffalo St.? (Neglect air resistance and any other forces from friction) a Aurora St.
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