2. What is an inelastic collision and give two examples of objects colliding inelastically:
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1 Chapter 7 Chrome Phet Simulator Name: This assignment, is completed in class Tuesday and Wednesday. This classwork will be treated as your prelab for the lab Thursday. (so it is part of your lab grade!) Don t forget HW is also due Thursday. Before going to the simulator, answer the following questions 1. What is an elastic collision and give two examples of objects colliding elastically: 2. What is an inelastic collision and give two examples of objects colliding inelastically: 3. What is the equation for an elastic collision: 4. What is the equation for an inelastic collision: 5. During an elastic collision, if the two objects colliding have the same mass what happens to their velocities? 6. Typically during an inelastic collision, the object with more momentum will (circle one) a. Continue in the same direction but slow down b. Continue in the same direction but speed up c. Change direction and speed up d. Change direction and slow down 7. Define Impulse:(definition, not formula)
2 Go to: Click on Play with SImulations Click on Under the Simulations Table of Contents on the left of the page Physics Click on Collision Lab Part 1 Elastic Collisions: 1. On the right side of the simulator, click on Velocity Vectors and Show Values. The Elasticity should be at 100%, and slid all the way right towards Elastic 2. Look at the Mass Table on the simulator Click on more data so the table looks like the one below: Elastic #1 3. Set the Red ball to have a mass of 1kg and an initial velocity of +1.5m/s. (do not press play until told to do so.) a. How much initial momentum(m R ) will the red ball have? (show all your work for full credit) 4. Set the Green Ball to have a mass of 1kg and an initial velocity of 0m/s. (do not press play yet) a. How much initial momentum(m G ) will the green ball have? (show all your work for full credit)
3 5. What is the total initial momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum initial = M R V i 6. Since this is the special elastic collision case, what should the final velocity of each ball be? a. Red Ball Final Velocity: b. Green Ball Final Velocity: c. What is the total final momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum Final = M R V f V f PRESS PLAY! 7. Make sure all of your settings are correct and Check your work. a. What is the final velocity of each ball? i. Red Ball: ii. Green Ball: 8. What is the impulse equation: 9. What is the impulse of the Red Ball:(show all your work for full credit) 10.What is the impulse of the Green Ball:(show all your work for full credit) 11.What do you notice about the Green and Red Balls impulse? (one complete sentence, this is your observation)
4 Elastic #2 Press the restart button next to the back button (not the red reset all button) 1. Set the Red ball to have a mass of 1kg and an initial velocity of +2.5m/s. (do not press play until told to do so.) a. How much initial momentum(m R ) will the red ball have? (show all your work for full credit) 2. Set the Green Ball to have a mass of 3kg and an initial velocity of -1m/s. (do not press play yet) a. How much initial momentum(m G ) will the green ball have? (show all your work for full credit) 3. What is the total initial momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum initial = M R V i 4. What is the initial total kinetic of the system?(show all your work for full credit) Total Kinetic Energy initial = ½ M R 2 + ½ M G 2 5. Use the system of equations process (discussed in class!) Solve for the final velocities of both balls.
5 6. Why are some of the factored answers impossible? (Write one COMPLETE sentence to get full credit) 7. Click play! 8. After the collision check your work, the final velocity(written about each respective ball) of each ball is: a. Red Ball Final Velocity: b. Green Ball Final Velocity: c. What is the total final momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum Final = M R V f V f 9. What is the impulse of the Red Ball:(show all your work for full credit) 10.What is the impulse of the Green Ball:(show all your work for full credit) 11.What do you notice about the Green and Red Balls impulse? (one complete sentence, this is your observation)
6 Complete the following Math Example 8. Solve the following elastic collision problem: Two marbles are moving towards each other, collide without changing shape and then bounce apart. The first marble(a) is 2kg and initially moving right at 0.5m/s. The second Marble (B) is 2.5kg and initially moving left at 0.1m/s. (show all your work for full credit) What is the total initial momentum of the system of marbles ( m A + M B ) What must be the total final momentum of the system of marbles? Using the conservation of Kinetic Energy, solve for the final velocities of both marbles: What is the final momentum of marble A? What is the final momentum of marble B? What is the final momentum of marble B? (remember Total = M A V f + M B V f )
7 Part 2 InElastic Collisions: 1. On the right side of the simulator, click on Velocity Vectors and Show Values. The Elasticity should be at 0%, and slid all the way right towards Inelastic 2. Click on more data so the table looks like the one below: Inelastic #1 3. Set the Red ball to have a mass of 1kg and an intial velocity of 1.5m/s. (do not press play until told to do so.) a. How much intial momentum(m R ) will the red ball have? (show all your work for full credit) 4. Set the Green Ball to have a mass of 1kg and a velocity of 0m/s. (do not press play yet) a. How much momentum(m G ) will the green ball have? (show all your work for full credit) 5. What is the total initial momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum initial = M R V i 6. Since Momentum is conserved: What must the final total momentum be: 7. Since this collision is 100% inelastic, what will physically happen to both objects?
8 8. Before pressing play, Solve for the final velocity of each ball. (remember they stick together, (show all your work for full credit) Total Momentum Final = (M R )V f a. Red Ball Final Velocity: b. Green Ball Final Velocity: 9. Why do both the green and the red ball have the same final velocity? Explain in 1 complete sentence. 10.Press Play! 11.After the collision, the final velocity(written above the set of balls) of each ball is a. Red Ball Final Velocity: b. Green Ball Final Velocity: c. What is the total final momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum Final = (M R +M G )V f 12.What is the impulse of the Red Ball:(show all your work for full credit) 13.What is the impulse of the Green Ball:(show all your work for full credit)
9 Inelastic #2 Press the restart button next to the back button (not the red reset all button) 12.Set the Red ball to have a mass of 1kg and an initial velocity of +2.5m/s. (do not press play until told to do so.) a. How much initial momentum(m R ) will the red ball have? (show all your work for full credit) 13.Set the Green Ball to have a mass of 2kg and an initial velocity of -1m/s. (do not press play yet) a. How much initial momentum(m G ) will the green ball have? (show all your work for full credit) 14.What is the total initial momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum initial = M R V i 15.What must the final total momentum be? 16.Before pressing play, Solve for the final velocity of each ball. (remember they stick together, (show all your work for full credit) Total Momentum Final = (M R )V f a. Red Ball Final Velocity b. Green Ball Final Velocity
10 17.Why do both the green and the red ball have the same final velocity? 18.Press Play! 19.After the collision, the final velocity(written above the set of balls) of each ball is a. Red Ball Final Velocity: b. Green Ball Final Velocity: c. What is the total final momentum of the Red and Green ball system? (show all your work for full credit) Total Momentum Final = (M R +M G )V f 20.What is the impulse of the Red Ball:(show all your work for full credit) 21.What is the impulse of the Green Ball:(show all your work for full credit) 22.If the balls are in contact for 0.3s, what is the average force on the green ball? 23.What do you notice about the Green and Red Balls impulse? (one complete sentence, this is your observation)
11 Complete the following Math Example 9. Solve the following inelastic collision problem: Two marbles are moving towards each other, collide without changing shape and then bounce apart. The first marble(a) is 2kg and initially moving right at 0.5m/s. The second Marble (B) is 2.5kg and initially moving left at 0.1m/s.(show all your work for full credit) What is the total initial momentum of the system of marbles (m A + M B ) What must be the total final momentum of the system of marbles? After the collision, the marbles stick together! What is the final velocity of marble A? What is the final velocity of Marble B? Post Lab: Answer in complete sentences 1. State the conservation of momentum. 2. What factors influence the momentum of an object? 3. Is it possible for tractor trailer and a motorcycle to have the same momentum? Explain why or why not.
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