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Can you check my answers? Dynamics

Can you check my answers? Dynamics

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Can you check my answers? Dynamics
Multiple choice questions: In the figure shown, two boxes are stacked and each surface has a known coefficient 1 1.1 of friction, but ua + µB. The bottom box is given an acceleration a and it is observed that there is slippage only on one surface. Pick the correct statement (A) Acceleration of box A maybe larger than µBg (B)) The minimum force needed is mBguB + MAGHA a ,HA MA (C) a < µB9 (D) Friction between A and gound is mBYPB +MAHAI 1.2 In the figure of problem 1.1, instead of pulling lower mass A, we start pulling on the top mass B, first gently, but then increasing the force slowly until some motion is observed. Pick the correct statement (A) It is impossible that both boxes start moving at the same time (B) Both boxes will move together no matter what (C) Both boxes move together only if mBYPB 2 MAHAI (D) Both boxes move together as long as friction between A and B is greater than (ma + mB)µA9 1.3 In the general motion of a rigid body, which of the following statements is correct about any two (different) points on the body? A. Components of the velocities of any two points along the line that connects them are the same B. Components of the velocities of any two points perpendicular to the line that connects them are the same C. Velocities of no two points can be the same, no matter what Ð. Angular velocities of the two points can be different, depending on the acceleration 1.4 Consider collision between two rigid bodies (pick one) A. Įmpulsive forces exist only along the line that connects the centers of mass B. For each body, the ONLY impulsive forces are perpendicular to the surface at the contact point. C. For each body, impulsive forces are perpendicular to the surface at the contact point, but there could be other impulsive forces elsewhere D. There can be collisions without any impulsive forces anywhere
Transcribed Image Text:Multiple choice questions: In the figure shown, two boxes are stacked and each surface has a known coefficient 1 1.1 of friction, but ua + µB. The bottom box is given an acceleration a and it is observed that there is slippage only on one surface. Pick the correct statement (A) Acceleration of box A maybe larger than µBg (B)) The minimum force needed is mBguB + MAGHA a ,HA MA (C) a < µB9 (D) Friction between A and gound is mBYPB +MAHAI 1.2 In the figure of problem 1.1, instead of pulling lower mass A, we start pulling on the top mass B, first gently, but then increasing the force slowly until some motion is observed. Pick the correct statement (A) It is impossible that both boxes start moving at the same time (B) Both boxes will move together no matter what (C) Both boxes move together only if mBYPB 2 MAHAI (D) Both boxes move together as long as friction between A and B is greater than (ma + mB)µA9 1.3 In the general motion of a rigid body, which of the following statements is correct about any two (different) points on the body? A. Components of the velocities of any two points along the line that connects them are the same B. Components of the velocities of any two points perpendicular to the line that connects them are the same C. Velocities of no two points can be the same, no matter what Ð. Angular velocities of the two points can be different, depending on the acceleration 1.4 Consider collision between two rigid bodies (pick one) A. Įmpulsive forces exist only along the line that connects the centers of mass B. For each body, the ONLY impulsive forces are perpendicular to the surface at the contact point. C. For each body, impulsive forces are perpendicular to the surface at the contact point, but there could be other impulsive forces elsewhere D. There can be collisions without any impulsive forces anywhere
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