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Physics Assement

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Submitted By bodyhammer2000
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Phys. 1401 (1) Critical Thinking:
Q1. A block of mass m rests on a horizontal surface and a student pulls on it with a force of magnitude F. Which of the situations shown below has the greatest normal force:

F F F

Q2. If a particle is being tossed up in our laboratory, the acceleration of the particle will be? (Neglect air resistance.) (a) 0 (b) 9.81 m/s2 (c) greater than 9.81 m/s2 (d) less than 9.81 m/s2

Q3. A man of weight 500 N stands on a scale in an elevator which is accelerating upward. The scale reading is: (a) 500 N. (b) less than 500 N (c) greater than 500 N (d) not enough information to determine it

(2) Communication:
Briefly describe the talk you presented to class and how well the audience understood what you discussed.

(3) Empirical and Quantitative Skills:
Q1. Using the following collected data of position vs time, find the average speed, velocity in the whole process and the instantaneous speed, velocity, and acceleration at t = 2.0 sec. (Note that the position is the vertical axis and its unit is in meter and the time is the horizontal axis and its unit is in second.) Position (m) | 0.50 | 1.00 | 1.00 | 1.50 | 1.70 | 1.90 | 2.10 | 1.80 | 1.50 | 1.20 | Time (sec) | 0.00 | 0.25 | 0.50 | 0.75 | 1.00 | 1.25 | 1.50 | 1.75 | 2.00 | 2.25 |

Q2. At one moment, the masses, positions, velocities, and accelerations of three particles are determined to have the values shown in the following table. What are the position, velocity, and acceleration of the center of mass of the three particle system? Mass (kg) | 0.5 | 0.3 | 0.4 | Position (m) | (1.0, 2.0) | (-1.5, 1.0) | (-0.5, -3.0) | Velocity (m/s) | 3.0, east | 2.0, west | 5.0, west | Acceleration (m/s2) | 1.0, west | 1.5, east | 0.5, west |

(4) Team Work: Q1. In not more than a few lines describe how you determined the acceleration of a freely falling object in the lab. Q2. In not more than a few lines describe how you determined the average power of your team member starting from the classroom in the first floor to a classroom in the second floor.

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