Physics 1050 Experiment 5. Momentum and Impulse

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1 Momentum and Impulse

2 Prelab Questions These questions need to be completed before entering the lab. Please show all workings. One cart is pushed towards another stationary cart. They collide, stick, and move together. v 1 m 1 v 2 = 0 m 2! m 1 m 2 initial final Prelab 1: Write the equation for the total momentum before the collision. Write the equation for the total momentum after the collision. Prelab 2: If m 1 = ± kg, m 2 = ± kg, v 1 = 0.25 ± 0.01 m/s, and v f = 0.07 ± 0.01 m/s, calculate the initial and final momentum and the impulse. Include uncertainty with each calculation. v f

3 Contents Part I: Introduction Part III: Impulse Part IV: Summary

4 Part I: Introduction You will also study the relationship between external force and momentum by examining the change in momentum of a system of carts. Impulse I is defined as the change in momentum of an object. Impulse is a vector quantity. I = Δ p = p f p i Impulse is also given as the product of force and time. I = FΔt!"! If the external force F is zero, then initial and final momentum will be equal: p f = p i

5 Experimental Set-up Your masses and carts are labelled. Cart 1 will have 1 black block. Cart 2 (with the plunger) will have 2 black blocks. Click here to open a file containing the masses of the rectangular black masses. (Units are grams and uncertainty is 0.1 g) Find your values and record them in Tables 1 and 2. Click here to open a file containing the masses of the cart. Search for your values and record them in Tables 1 and 2. Place the carts UPSIDE DOWN when not using them. Find the total mass for each cart and record your result in Tables 1 and 2. You may need to depress the plunger on Cart 2 by pushing in and up on the plunger.

6 Expectation Before collecting your data and calculating your results, consider your hypothesis of this experiment: QUESTION 1: After cart 1 has been pushed, are there any external forces acting on the carts? If so, what is the force? Considering this, do you expect the momentum after the collision to be greater than, less than, or equal to the momentum before the collision?

7 Experimental Set-up Place both carts on the track. Place the motion detector 40 cm from Cart 1. Attach the white card to the Cart 1 so that the card faces the motion detector. The magnetic ends of the carts must be facing each other! Make sure your track is level.

8 Launching LoggerPro Make sure that your Labpro is plugged in and turned on. Plug the Motion Detector into DIG/SONIC 1 on the side of the Labpro. Launch Logger Pro by clicking on the icon below: CLICK HERE CLICK HERE Logger Pro should open with a window containing a graph of Distance vs. Time.

9 Data Collection Click collect in your LoggerPro window. Wait for the motion detector to make a clicking noise. Apply a gentle push to the cart with the card attached. It should hit the stationary cart and they should stick together. Inspect your graph. It should resemble the graph shown here.if it does not, repeat the experiment. If you are not satisfied with the appearance of your graph after attempts, consult an instructor. Have an instructor check your graph and initial your report.

10 Data Analysis Click the examine button in LoggerPro. Move your cursor so it coincides with the collision point. From the pop up box on your graph record the time of the collision in Table 3. To find velocity before the collision: click and drag your mouse to highlight the 10 points before the collision. Click Analyze, then Linear Fit. Double click on the pop-up box and check Show Uncertainty for slope. Enter your results in Table 4. Highlighting 10 points on your graph after the collision, determine the velocity and associated uncertainty after the collision. Enter your results in Table 4. Print your graph: In LoggerPro choose then.

11 Data Analysis Using the equations from Prelab 1, determine the total momentum both before and after the collision. Include uncertainties. Record your results in Table 5. Also calculate and record the impulse and its uncertainty in Table 5. QUESTION 2: Is the impulse zero or non-zero (within the uncertainty)? Is momentum conserved in this collision? Is there an external force acting on the carts during the collision? If yes, what do you think this force is?

12 Part II: Force and Impulse on Each Cart, Predictions QUESTION 3: During the collision between the carts, is there a net force on cart 1? What makes this force? QUESTION 4: During the collision between the carts, is there a net force on cart 2? What makes this force? QUESTION 5: Considering Newton s Third Law, how do you expect the net forces on cart 1 and cart 2 to be related? QUESTION 6: Considering your answer to the previous question, how do you expect the impulse on cart 1 and cart 2 to be related? Why?

13 Part II: Force and Impulse on Each Cart, Calculations Use the data recorded in Tables 1 5 to determine: The initial momentum of cart 1. (Record in Table 6) The final momentum of cart 1. (Record in Table 6) The initial momentum of cart 2. (Record in Table 7) The final momentum of cart 2. (Record in Table 7) The impulse of cart 1. (Record in Table 8) The impulse of cart 2. (Record in Table 8) QUESTION 7: Write the impulse on each cart. Include uncertainty. Do your answers agree with your expectations from Question 6? Comment.

14 Part III: Summary QUESTION 8: QUESTION 9: List at least three sources of uncertainty in this experiment. Classify them as random or systematic. Write a brief summary of this experiment. Be sure to include: " the details of what was done in the experiment " how the data was analyzed " the results of the analysis " your conclusions from your experiment.

15 Wrap it up! Check that you have completed all questions and tables. Include your graph: Distance versus Time (LoggerPro)

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