Conservation of Momentum & Collisions sLab

1. Name:Partner:Period:Date: Conservation of Momentum & Collisions sLab

2. Collisions sLAb“What’s the Point Ahad” • Study and Simulate different conditions of Elastic collisions • First we will use the equations and our remarkable math skills to study the properties and outcomes • Then we will use a simulation program to validate our calculations, and to visualize what physically happens during collisions • The math is based on the physical, the different values you calculate will represent the different physical outcomes of collisions

3. Partner up • Pick a Partner (Try picking some one new for once) • One Partner Download and Save this Collisions sLab Handout (sLab Tab) • One Partner Click the Simulation image in the sLab Tab • As usual one person types in the handout while the other controls the simulation. Make sure to alternate tasks • Follow the instructions • When you are finished remember to email the handout so both of you have the information and hand out • If you need any help ask

4. The Simulation First Things First 2. Uncheck this Box 1. Click more Data

5. SimulationThis is what your simulation should look like before each approach • This is what your simulation should look like before each approach • I recommend slowing down the simulation speed by toggling the Sim Speed bar • You simply move the cursor to move your cursor into the box you want to type your value. Use – to make values negative • Neglect the Position Column • Restart brings the balls back to original positions without changing values * It is important to know that the initial velocities and momenta are displayed before the collision and will change in the same box to final values after the collision

6. Familiarize Yourself With the Sim • Play around with the simulation and get used to all the settings and how they change the different characteristics of the moving objects • Yes I did say play around. Get it out of your system. • Remember her • Once your familiar, get on with the lab • Have Fun

7. Part 1 One Object in Motion and the other at rest Simulate Collision When: • Masses of Ball 1 and 2 are Equal • Moving Ball (Ball 1) is very massive compared to Ball 2 • Moving Ball (Ball 1) is less massive than Ball 2

8. Feel Free to add any notes in the “Click to add notes Below” Part 1 AMasses of Ball 1(A)and 2(B) are Equal Initial (Before Collision) FInal(After Collision) Af mA= 3 kg vAf = 0 m/s Ai mA = 3 kg vAi= +1 m/s Bi mB= 3 kg vBi= 0 Bf mB= 3 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

9. Feel Free to add any notes in the “Click to add notes Below” Part 1 BMoving Ball (1A) is massive vs. stationary Ball 2B Initial (Before Collision) FInal(After Collision) Af mA= 9 kg vAf = + 0.5 m/s Ai mA = 9 kg vAi= +1 m/s Bi mB= 3 kg vBi= 0 Bf mB= 3 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

10. Feel Free to add any notes in the “Click to add notes Below” Part 1 CMoving Ball 1A is less massive than stationary Ball 2B Initial (Before Collision) FInal(After Collision) Af mA= 3 kg vAf = - 0.5 m/s Ai mA = 3 kg vAi= +1 m/s Bi mB= 9 kg vBi= 0 Bf mB= 9 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

11. Part 2 Both Objects Moving Towards Each Other Simulate Collision When: • Both Balls Equal Masses and Speeds • Both Balls Equal Masses but One with greater Speed • Both balls with same speed but Ball 1A with greater mass

12. Feel Free to add any notes in the “Click to add notes Below” Part 2 ABoth Balls Equal Masses and Speeds Initial (Before Collision) FInal(After Collision) Af mA= 3 kg vAf = - 1 m/s Ai mA = 3 kg vAi= +1 m/s Bi mB= 3 kg vBi= - 1 m/s Bf mB= 3 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

13. Feel Free to add any notes in the “Click to add notes Below” Part 2 BBoth Balls Equal Masses but One with greater Speed Initial (Before Collision) FInal(After Collision) Af mA= 3 kg vAf = - 1 m/s Ai mA = 3 kg vAi= +3 m/s Bi mB= 3 kg vBi= -1 m/s Bf mB= 3 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

14. Feel Free to add any notes in the “Click to add notes Below” Part 2 CBoth balls with same speeds but Ball 1A with greater mass Initial (Before Collision) FInal(After Collision) Af mA= 12 kg vAf = + 0.2 m/s Ai mA = 12 kg vAi= +1 m/s Bi mB= 3 kg vBi= -1 m/s Bf mB= 3 kg vbf = ? Using the equation, calculate the final velocity (include direction) of Ball 2Answer: Set Up the simulation using the variables as given above Was your calculated final velocity confirmed? Answer: What was the initial momentum of A & B, and total initial momentum? Answer: PAi) PBi) PTotal initial) Why What was the final momentum of A & B? Answer: PAf)PBf)PTotalfinal) Include any observations on changes in velocity, momenta or direction? Answer:

15. Key questions?(Explain when you Answer) • Did the equation for the law of conservation of momentum give you valid results for your calculations? • How did individual momenta change after collisions? • How did Total Momentum Change? • What determined the change in the magnitude and direction of velocity? • Did the simulation help you see anything differently than only applying the equation and math? • If so how?