2LA Lab 5 Rubric

PHYS 2LA Lab 5 : Newton’s 2nd Law Setting Up the Apparatus: 1. “Why is it important that the track is level?” (Q after 1.1, p. 3) 2. “ Using the scale provided, record the mass in kg of the cart, attachments, weight hanger, and weights. Note any uncertainty in the measurements. ” (1.3, p. 4) 3. “What kind of uncertainty is this drift in the force and acceleration sensors?” (Q after 1.5, p. 5) 4. “Why is it important that the string is parallel with the track?” (Q after 1.6, p. 5) Varying Hanger Mass 1. “Be sure to draw force diagrams in your notebook describing the force acting on the smart cart and hanger for each configuration.” (p. 6) 2. “Record the total mass of the hanger in your notebook …” (2.1, p. 6) 3. “… How can you tell when you let the cart start moving?” (2.3.1, p. 6) 4. “ From these curve fit parameters, what is the acceleration of the cart? Record this value and the associated uncertainty in your notebook. ” (2.3.5, p. 7) 5. “ What physically happened to cause the large negative spike near the end of your acceleration data? Why is it important to not include this spike in our analysis? ” (Q after 2.4.1, p. 7) 6. “… s elect ‘ Mean ’ and ‘ Standard Deviation. ’ Record these values as the acceleration and associated uncertainty of the cart. ” (2.4.2, p. 7) 7. “Find the force exerted by the hanger when the cart was not moving and the associated uncertainty.” (2.5.2, p. 8) 8. “… find the force and associated uncertainty for when the cart is moving .” (2.5.3, p. 8) 9. “ Sketch by hand (you may use a computer) a graph of 𝑎⃗ vs 𝑚 . Include this graph and the ones you made in 2.6 in your lab notebook. Does this graph follow the trend you expect? Why or why not. ” (2.8, p. 8) Measuring acceleration on an Inclined Plane 1. “ Draw force diagrams in your notebook describing the force acting on the cart for each configuration. ” ( 3.1 on p. 9) 2. “ Record the exact angle in your lab notebook (with appropriate uncertainty. ” (3.2, p. 9) 3. Write down in your notebook your prediction for the acceleration in each case listed. (3.3, p. 9) 4. “ Using the position vs time method from 2.3, measure the acceleration of the cart on this same inclined plane for each value of mass. Record these acceleration values, with the appropriate uncertainty, in your lab notebook. ” (3.4, p. 9) 5. “ How do these five acceleration values compare within uncertainty? Are they consistent with each other? Why or why not? Make a plot in your notebook of these five values. ” (3.5, p. 9) Conclusions 1. “ For acceleration down an inclined plane, does acceleration depend on the cart mass? How do you know? ” (p. 9) 2. “ Calculate g using Eq. 2 from above. How accurate is your calculated value? Discuss any uncertainties that you think may have contributed to your value differing from 9.8 m/s 2 . ” The intent is using the data from part 4. (p. 9)