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Physics 211 Hour Exam 1

Physics 211 Hour Exam 1. Info: Room assignments are linked on course webpage. Go to the right room 15 minutes early. There is no curve on any of our exams. Strategy: Read the whole exam before you start and do the easy ones first. Don’t “equation hunt” - there are “distractors”.

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Physics 211 Hour Exam 1

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  1. Physics 211 Hour Exam 1 • Info: • Room assignments are linked on course webpage. Go to the right room 15 minutes early. • There is no curve on any of our exams. • Strategy: • Read the whole exam before you start and do the easy ones first. • Don’t “equation hunt” - there are “distractors”. • You can get partial credit on the 5 part questions…

  2. Partial Credit    2   3   0     0  6 • For the 3 answer questions you can only mark one choice! Answer A (correct) Answer B (wrong) Answer C (wrong)  3  0   0 • Suppose this is a 5 answer question and you bubble Answer A (correct) Answer B (wrong) Answer C (wrong) Answer D (wrong) Answer E (wrong)

  3. How this review will work: • We will move fast (2 minutes/problem) • I’ll give you a hint (if needed) • You will discuss with your neighbor and vote again • I will summarize

  4. Swinging Tennis Ball “The net force is towards the center. Therefore the tension must be greater than the weight..” A B C

  5. Pushing One Block “When the block does not move, static friction force is always equal to the force pushing it.” A B C D

  6. Crazy Taxi Ride A B C D E “you are trying to stay straight but the car turns.”

  7. Bugs on a Turntable 1 “The ladybugs acceleration is greater because it is v^2/r and the higher r the higher v, and it is v^2/r.” A B C D E

  8. Bugs on a Turntable 2 “When setting net force equal to frictional force, mass cancels out, and everything else is the same.” A B C D

  9. Graphing a Cart's Motion “Acceleration is constant when position vs time is a parabola.” A B C

  10. Lifting with Pulleys “tension in the string is the same everywhere which equals W because there is no acceleration..” A B C D E

  11. Cart on a Ledge “The forces are balanced initially with T0=m1g, and as m1 accelerates downward when the cart is released T<M1g and therefore less than T0.” A B C D E

  12. Boxes Hanging off a Table “Because the acceleration of m1 has decreased, the T1 will decrease also..” A B C

  13. Riding in an Elevator “While the elevator is not accelerating, the normal force will be constant, but while the elevator is accelerating upwards, it will increase, and while it is accelerating downwards it will decrease.”

  14. Pushing Eight Blocks “F12 is 7/8 of the total force and F78 is 1/8 of the total force. (7/8)/(1/8)=7.” A B C D E

  15. Slowing Down “The car is slowing down at a steady rate, so the acceleration is constant. And if the car is moving in the positive x direction and is slowing down, the acceleration must be negative.”

  16. Speeding Up “Since it's speeding up in the negative direction, acceleration is negative..”

  17. Turning Around “The car slows down while moving in the negative x direction, indicating a constant positive acceleration, than speeds up at a constant rate in the positive direction, still indicating constant positive acceleration.”

  18. Pushing Stacked Blocks “Fnet=ma For M, the net force is Ma, which is the smallest..” A B C D

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