 #1
 5
 0
Homework Statement
Okay, we have a lab about elastic and inelastic collision, and we have to do it in an air table/spark table that generates dots (can be like ticker tapes). We have to determine Momentum (P and P') and Kinetic Energy (Ek and Ek')
Please view my attachment.
(' = after collision)
our data:
distance
d1 = 0.21 m
d1' = 0.34 m
d2 = 0.21 m
d2' = 0.32 m
time
t1=0.3s
t1'=0.5s
t2=0.3s
t2'=1.0s
I get that everything is straightforward, but since its a lab and I have no partner, I wanted to make sure my equations and calculations are right (there's no handout to refer, or text book examples)
I already solved the initial velocity, for the velocity after, do I use equation 1 or 3?
For solving P, we use 2 right? Or no? and we find P' using 3?
We won't be using the degrees, right?
And we dont need 4 right?
Lastly, for Ek, we use 5 to get the Ek? but what do we use/do to get Ek'? Do we use 5 or 6
Homework Equations
1 Velocity: V=d/t
2 Momentum: P=mv
3 Momentum(?)/Collision(?): m1V1 + m2V2 = m1V1' + m2V2'
4 Work: W=F(cosθ)d
5 Kinetic Energy: Ek=1/2mv^{2}
6 Ek=Ek'
The Attempt at a Solution
I already solved the initial velocity:
V1 = 0.21/0.3
= 0.7 m/s
V2 = 0.21/0.3
= 0.7 m/s
for the velocity after, I tried doing both 1 and 3. But I got two different answers (When solving for V1' or V2', I used the V1' or V2' in the equation). So do I stick to 1?
V = d/t
V1'= 0.34/0.5
= 0.7 m/s
V2' = 0.32/1
= 0.32 m/s
The rest of the question, I am stuck. I want to continue solving but then, I realize I might screw up on parts and get zero on my lab. See, I'm getting confused on which equations to use.
I am just looking for guidelines, not answers.
I hope you guys can help me. Thanks a lot:)
Attachments

2.2 KB Views: 377
Last edited: