Part 1: Coin collisions Setup 8: tips On a smooth surface, set two coins down a couple of centimeters [an inch or so] apart. and indicate their starting positions. It's helpful if your surface has some sort of lines on it (e.g. visible wood grain] so you can line the coins up for a good direct collision. A nickel and a penny on a wooden table, with a toothpick pointing to the location ofeacli. The toothpicks are parallel to one another. Then, flick one at the other. You'll want to do this in such a way that you can be fairly consistent with how hard you're flicking the coin. What worked for me is to press the tip of my finger against the table, with my fingernail just touching the coin. Then I quickly extend my finger, but leave my hand in the same place. Before the coin is flicked, my finger is pushed against the table, just touching the coin (a). To flick the coin, I quickly extend my finger to set the coin in motion (b). (a) Before (b) After It helps to have a lab partner:Observations For all ofthe following investigations, do more than one trial so you can be sure to make thorough observations of the overall trends you see. You will ick a coin at another coin that is at rest. Call the icked coin A and the second coin 3. Make the following observations: 1. What does coin A do after the collision? Does it continue moving in the same direction, does it stop immediately [ending in the same location that coin B started], or does it rebound back the way it came? Your initial position markings are very helpful here. 2. If coin A continues in the same direction or rebounds, how far does it move? You may give qualitative descriptions [you don't need to make precise measurements]. 3. How far does coin 3 travel after being struck by coin A? (Again, you do not need to make precise measurements.) 4. Swap which coin is A and which is B and repeat. [For example, if you started with the penny as A and the nickel as B, now swap them so the nickel is A and the penny is 3.] In addition to making the same observations as before, make comparisons. Did the motion of coin A after the collision change or stay the same? How did the distance traveled by coinA after the collision change? How did the distance traveled by coin B change? Record your observations in the appropriate space below: Pair 1: Penny 8: Nickel A = Penny, B = Nickel 0 Motion of A after collision {forward I stop ,1 rebound]: I Distance traveled by A after collision [qualitative]: I Distance traveled by B after collision [qualitative]: A = Nickel, B = Pennyr I Motion of A after collision [forward I stop '1' rebound]: I Distance traveled by A after collision [qualitative]: I Distance traveled by B after collision [qualitative]: I Comparisons when swapped: Pair 2: Dime 8:: Quarter A = Dime, B = Quarter I Motion of A after collision [forward/ stop} rebound]: I Distance traveled by A after collision [qualitative]: I Distance traveled by B after collision [qualitative]: A = Quarter, B = Dime I Motion of A after collision [forwardf stop} rebound]: I Distance traveled by A after collision [qualitative]: I Distance traveled by B after collision [qualitative]: I Comparisons when swapped: Pair 3: Any coin & the same kind of coin For this last pair, use a pair of the same coins [e.g. two quarters]. - Coins used: - Motion ofA after collision [forward/stop/rebound]: - Distance traveled by A after collision [qualitative]: - Distance traveled by B after collision [qualitative]: Followup questions For reference: Dimes and pennies have about the same mass, but pennies are slightly more massive. Nickels have twice the mass of pennies, and a bit more than twice the mass of dimes. Quarters and nickels have about the same mass, but quarters are slightly more massive than nickels. 1. Considering conservation of momentum, explain the comparisons in the last column of the table when the coins were swapped. 2. Compare your observations of pair 1 to the observations of pair 2. In what ways were the behaviors similar? In what ways were they different? Be specific. 3. How did the behavior of the coins in pair 3 compare to the behavior of the other three pairs? Explain with conservation of momentum.Part 2: Ball stack Setup 8: tips You will be releasing the balls from rest, both independently and then stacked one on top of the other. You'll want to release them from a consistent height. I recommend holding the balls with your arms extended directly out from you. If you do this. you will consistently release the balls from shoulder height. For the ball stack. hold the balls so the smaller ball is sitting right on top of the larger ball. It is important to get the small ball centered over the large one. If the balls are not centered. the small ball will go in some random direction after they hit the ground. This part of the lab is best done outside. If that is not an option. do not drop them from very heigh. Perhaps. kneel instead of standing. Before dropping the ball stack. remove anything fragile from the vicinity. Observations You may want to do each investigation more than once. to observe overall trends. 1. Release the small ball from rest. Observe how high it rebounds. 2. Release the large ball from rest, from the same height as before. Observe how high it rebounds. 3. Stack the balls so the small ball is on top of the large one. Release them from rest, from the same height as before. Observe how high each ball rebounds. For the height observations, you do not need to make precise measurements. It would be effective to make height observations relative to yourself. For example, if you are standing up and release a ball from shoulder height, you may say a ball rebounds to knee height. Use the table below to organize your observations: Dropped ball(s) Rebound height of small ball Rebound height of large ball Small ball (N/A) Large ball (N/A) Ball stack Followup questions Except in extreme cases, it is reasonable to assume the larger ball is more massive than the small ball. 1. Compare the rebound height of the small ball dropped by itself to the rebound height of the small ball when dropped as part of the stack of balls. 2. Compare the rebound height of the large ball dropped by itself to the rebound height of the large ball when dropped as part of the stack of balls. 3. Considering momentum conservation, explain the differences observed in the rebound heights in the previous two questions. I am aware of several good videos of this phenomenon on Youtube. Refrain from watching them until after you have completed this lab. Your responses need to be based on your own observations, and in your own words.Specifications Your submission for this lab must meet the following specications: Part 1: Coin collisions 1. Recorded observations are full and complete. It is evident that care was taken to get clear. consistent results. Response to followup question 1 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication. Response to followup question 2 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication. Response to followup question 3 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication. Part 2: Ball stack 1. 2. Recorded observations are full and complete. It is evident that care was taken to get clear, consistent results. Response to followup question 1 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication. Response to followup question 2 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication. Response to followup question 3 is complete, clear, and accurate. Response is consistent with the observations presented. Response is written in complete sentences with spelling and grammar conventions appropriate to professional science communication