front 1 Disk # Diameter (D) (cm) Circumference (C) (cm) (Pi) =C/D 1 1.268±0.002 4.0±0.1 3.15±0.08 1 1.266±0.002 4.1±0.1 3.24±0.08 5 25.3 ±0.1 79.7 ±10.2 3.15 ±0.01 5 25.4 ±0.1 79.6 ±0.2 3.13 ±0.01 1. Which disk measurements (1 or 5) provide a more precise
determination of pi and why? | back 1 D. Disk 5 because both precision errors, on C and D, are a small fraction of the measurements. |
front 2 2. Including the rest of the disk measurements, we then get an average of (pi) = 3.149±0.008. What should we conclude from this? A. Our determination disagrees with the accepted value of (pi), since 3.149±3.14159... B. Our determination disagrees with the accepted value of (pi), not within the precision error. C. Our determination agrees with the accepted value of (pi), since the precision and accuracy are comparable and reasonably small. D. It is difficult to conclude anything from the uncertainties involved. | back 2 C. Our determination agrees with the accepted value of (pi), since the precision and accuracy are comparable and reasonably small. |
front 3 3. For the Graph Matching lab today, what kind of sensor will we be
using to take data? B. A motion detector. C. A photogate timer. D. A video camera. | back 3 B. A motion detector. |
front 4 4. What object will we be measuring the motion of? C. A rolling chair, D. A falling object. | back 4 A. You! |
front 5 5. During the first 4 seconds, what is true about the acceleration? A. It is constant B. It is increasing at a constant rate C. It is increasing at a variable rate D. It is discontinuous | back 5 A. It is constant |
front 6 6. During the first 4 seconds, what is true about the distance? A. It is constant B. It is increasing at a constant rate C.It is increasing at a variable rate D. It is discontinuous | back 6 C. It is increasing at a variable rate |
front 7 7. In the projectile motion lab we measure the initial velocity of the ball by: A. Using a stopwatch to measure the time of fall and the measured horizontal distance. B. Calculating it based on initial height and range when the ball is fired horizontally C. Using a photogate timer D. Using a motion sensor | back 7 B. Calculating it based on initial height and range when the ball is fired horizontally |
front 8 8. The purpose of the projectile motion lab is to: A. Predict and then verify the range of a projectile fired at an angle. B. Measure and then calculate the range of a projectile fired at an angle. C. Predict and then verify the range of a projectile fired horizontally. D. Measure and then calculate the range of a projectile fired horizontally. | back 8 A. Predict and then verify the range of a projectile fired at an angle. |
front 9 9. For last week's lab, we determined the initial velocity of the
projectile by firing horizontally off the lab bench to the floor and
measuring the average range. We collect data and find that from a
launch height of h = 1.10 m the average range is 2.37 m. What is the
launch velocity? B. 4.81 m/s C. 4.90 m/s D. 5.00 m/s | back 9 D. 5.00 m/s |
front 10 10. The precision of the projectile lab is based on: B. how close to the predicted range the measured range is. C. how accurate the meter stick is. D. all of the above. | back 10 A. how much spread there is in individual hits. |
front 11 11. Static friction is always identical to starting friction. True or
False? B. False | back 11 B. False |
front 12 12. Kinetic friction is modeled as the coefficient of kinetic friction times the normal force. True or False? A. True B. False | back 12 A. True |
front 13 13. The coupled system lab was designed to test Newton's 2nd Law. We found that the measured acceleration was____than the theoretical acceleration (mh *g/(mh + mc)), primarily due to____. A. much less, friction and air resistance
C. a few percent more, rolling friction D. much greater, friction and air resistance | back 13 B. a few percent less, rolling friction |
front 14 14. For a hanging mass of 70g with a downwards acceleration of 1.40
m/s, we find that the measured tension in the string is:
A. 0.59 N B. 0.69 N C. 0.78 N D. 5.9 N E. 6.9 N F. 7.8 N | back 14 A. 0.59 N |
front 15 15. For lab this week we will investigate work and energy. In order
to raise a mass up at a constant speed, the
applied force must be ____ its weight.
A. less than B. equal to C. greater than | back 15 B. equal to |
front 16 16. For lab we will investigate how work done is equivalent to:
A. absolute potential energy B. absolute kinetic energy C. changes in either potential or kinetic energies | back 16 C. changes in either potential or kinetic energies |
front 17 17. The above graph shows force vs. height as a mass is being raised. The starting height at the left edge of the shaded area is 0.60 m. The ending height at the right edge of the shaded area is 1.50 m. If the average force is 2.00 N, what is the work done in raising the mass? A. 1.20 J B. 1.80 J C. 2.22J D. 3.00 J E. Need to know the mass | back 17 B. 1.80 J |
front 18 18 . A cart with mass 1.5 kg is accelerated by a force whose average value is 3.24 N. The cart starts at rest and has a final speed of 1.1 m/s. For what distance did the force act? A. 0.23 m B. 0.28 m C. 0.65 m D. 0.71 m E. 0.83 m F. 0.91 m | back 18 B. 0.28 m |
front 19 19. For a vertical oscillating mass on a spring, its height vs time and its velocity vs time: A. are moving up and down together in time.
B. are such that when one is maximum or minimum, the
other is at its mid-point. | back 19 B. are such that when one is maximum or minimum, the other is at its mid-point. |
front 20 20. For this lab we will investigate energy in simple harmonic motion. We expect____to be conserved. A. Kinetic Energy B. Potential Energy C. Total Mechanical Energy D. All of the above | back 20 C. Total Mechanical Energy |
front 21 21. For a mass hanging from a vertical spring, which of the above curves represents the kinetic energy vs. time if the mass is released from rest below the equilibrium? A. Solid Flat Line on Top B. Dashed Curve C. Solid Curve D. Solid Flat Line Bottom | back 21 C. Solid Curve |
front 22 22. For a mass hanging from a vertical spring, which of the above
curves represents the potential energy vs. time if the mass is
released from rest below the equilibrium? B. Dashed Curve C. Solid Curve D. Solid Flat Line Bottom | back 22 B. Dashed Curve |
front 23 23. Which of the following types of collisions are not represented in
the 3 parts of today's lab? B. Inelastic C. Completely Inelastic D. Super-Elastic | back 23 D. Super-Elastic |
front 24 24. For this lab we will investigate momentum and energy in collisions. For all of the collisions we expect _____to be conserved. A. Total Momentum B. Total Mechanical Energy
C. Total Momentum and Total | back 24 A. Total Momentum |
front 25 During the collision lab, the following measurements are taken: m1 = 0.550 kg vl before =3.27 m/s vl after = 0.45 m/s m2 = 0.540 kg v2 before = 0.0 m/s v2 after = 2.67 m/s 25. Which type of collision does this represent? A. Elastic B.Super-Elastic C.Totally inelastic D. Partially inelastic | back 25 D. Partially inelastic |
front 26 26. Approximately how much of the initial mechanical energy is lost
in the collision? A. 0% B. 33% C. 50% D. 100% | back 26 A. 0% |
front 27 27. In a car collision, the driver's body changes speed from a high
value to zero, with or without an airbag. So why use an airbag? B. It reduces the impact time C. It gives less impulse D. All of the above | back 27 A. It reduces the impact force |
front 28 28. You want to close an open door by throwing either a 100g lump of clay or a 100g rubber ball toward it. You can throw either object with the same speed, but they are different in that the rubber ball bounces off the door while the clay just sticks to the door. Which projectile will be more likely to close the door? A. the clay B. the rubber ball C. both equally likely | back 28 C. both equally likely |
front 29 29. For the ballistic pendulum last week the collision between the ball and the pendulum arm is A. Totally inelastic B. Partially inelastic C. Elastic D. Super-elastic | back 29 A. Totally inelastic |
front 30 30. Approximately how much of the initial mechanical energy is lost in the collision? A. 0% B. 26% C. 52% D. 78% E. 100% | back 30 D. 78% |
front 31 31. In a car collision, the driver's body changes speed from a high value to zero, with or without an airbag. So why use an airbag? A. It reduces the impact force B. It reduces the impact time C. It gives less impulse D. All of the above | back 31 A. It reduces the impact force |
front 32 32. You want to close an open door by throwing either a 100g lump of clay or a 100g rubber ball toward it. You can throw either object with the same speed, but they are different in that the rubber ball bounces off the door while the clay just sticks to the door. Which projectile will be more likely to close the door? A. the clay B. the rubber ball C. both equally likely | back 32 B. the rubber ball |
front 33 33. Which of the following impulses will change the velocity of an object the most? A. Fave = 50.0N, At = 0.10 sec B. Fave = 10.0N, At = 0.50 sec C. Eave = 2.0N, At = 5.0 sec D. Fave = 0.5N, At = 10.0 sec | back 33 C. Eave = 2.0N, At = 5.0 sec |
front 34 34. What is the average force acting on a tennis ball by a tennis
racket if the tennis ball (m = 0.070 kg) comes in at 30.0 m/s and
returns in the opposite direction at 30.0 m/s and is in contact with
the tennis racket for a total time of 0.010 sec? B. 0.042 N C. 210 N D. 420 N | back 34 D. 420 N |
front 35 35. For lab this week, what type of collision is made between the
ball and arm attached to the turntable? B. Partially inelastic C. Elastic D. Super-elastic | back 35 A. Totally inelastic |
front 36 36. What quantity (or quantities) will be conserved in the collision between the ball and the arm attached to the turntable? A. Mechanical energy B. Linear momentum C. Angular momentum D. All of these quantities | back 36 C. Angular momentum |