Objects that move in a straight line with a constant speed—not speeding up or slowing down—have zero acceleration. We call this kind of motion: Uniform Motion. We can identify uniform motion when the object travels equal distance intervals in equal times.
We can identify non-uniform motion, or accelerated motion, when the object travels equal distance intervals in unequal times. Finally, we have two types of non-uniform motion: motion with constant acceleration and motion with a non-constant (or changing) acceleration.
Activity 1
Today you will analyze the motion of a cart traveling along an inclined track. You will begin by doing a thought experiment, predicting the motion of your object. Discuss your ideas among your group…it is okay to disagree!
Sketch an acceleration-versus-time graph for an object, starting with some initial speed, traveling on a flat track. Remember, this sketch is a prediction; what do you think it would look like? Then sketch a velocity-versus-time graph for the same case.

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1. Explain the shape of your acceleration graph.
2. Explain the shape of your velocity graph.
Sketch an acceleration-versus-time graph and a velocity-versus-time graph for an object, starting with some initial speed, traveling down an inclined track.
3. Explain the shape of your acceleration graph.
4. Explain the shape of your velocity graph

Activity 2 Now, using a track, cart meter stick and stopwatches, you will make some measurements to determine if a cart traveling down a ramp follows uniform or non-uniform motion.
First, mark a start point and end point on your track that is at least 1.5m long.

5. How many time/distance data points, between start and end, will be necessary to determine whether the cart is traveling with uniform or non-uniform motion? Explain your choice. Note: you may want to look at Questions 8 & 9 to help inform your choice.

6. Now, outline your measurement plan (procedure) to make this determination of uniform or non-uniform motion. Your procedure should include clear instructions, such that anyone could reproduce you experiment exactly.

7. Create a data table and record your data in the space below.

8. Now you will need to use your data to calculate velocities and accelerations. Recall that we have discussed average velocity as vavg = Δx/Δt as well as vavg = (vi + vf)/2. We also discussed average acceleration as aavg = Δv/Δt. Using these equations, calculate the final velocity of your cart at each distance/time data point and the average acceleration between each pair of distance/time data points. When you have completed your calculations, organize your results into a table with five columns: distance, time, average velocity, final velocity, and average acceleration.

9. Now you will graph your results. Plotting [1] a graph of position (y-axis) vs. time (x-axis); [2] a graph of velocity (y-axis) vs. time (x-axis); and [3] a graph of acceleration (y-axis) vs. time (x-axis). Be sure to fully label your graphs. This may be done on a computer or on graph paper. Attach your graphs to the back of this packet.

10. Based on your data and results, answer the lab questions: does a cart traveling down a ramp follow uniform or non-uniform motion? If it follows non-uniform motion, is the acceleration constant or non-constant? Support your answer with evidence from your experiment.

11. Are you confident in your answer to question 10? Explain why or why not.

12. Now, compare your answer (and resulting graphs) to the prediction sketches you made in Activity 1. Do your predictions match your results? If not, which do you believe (prediction or results) and why?

13. Finally, take some time to evaluate your procedure. Do you think it was an effective procedure? Were there any problems with it? How would you change/improve upon the procedure if you were to repeat this experiment?


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PHYSICS 110: LABORATORY 2: Motion was first posted on October 7, 2019 at 7:33 am.
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