- #1
annamae
- 5
- 0
Homework Statement
For our final project we have to design a lab, take the data, and write a lab report. My lab is bouncing balls of different masses, onto different surfaces, from different heights, and use balls of different materials in order to see what factor influences efficiency the most. I am now onto the calculation section and not sure of what equations would be relevant or if I'm even doing them right.
Homework Equations
PE1 x 100
PEinitial
KE = mg(h0-h1)
KE = ½mv2
mg(h0-h1) = ½mv2
The Attempt at a Solution
1. PE1 x 100
PEinitial
mgh1 x 100
mghinitial
(.18)(9.8)(.68) x 100
(.18)(9.8)(1)
68% - the amount of potential energy retained after impact
2. KE = mg(h0-h1)
KE = (.18)(9.8)(1-.68)
KE = .56448 J
a measurement of the joules that the ball has at the top of the second bounce
3. KE = ½mv2
mg(h0-h1) = ½mv2
(.18)(9.8)(1-.68) = ½(.18)v2
.56448 = .009v2
7.919 m/s = v
a measure of velocity when the ball is dropped