Register to reply

Elastic collision question: two marbles

by GFWD
Tags: collision, elastic, marbles
Share this thread:
GFWD
#1
Oct3-07, 01:19 PM
P: 1
I just want to know if I am approaching this question correctly.

1. The problem statement, all variables and given/known data

Two marble spheres of masses 30 and 20 grams, respectively, are suspended from the ceiling by massless strings (.95m long). The lighter sphere is pulled aside through an angle of 75 degrees and let go. It swings and collides elastically with the other sphere at the bottom of the swing.
a) To what maximum angle will the heavier sphere swing.
b) To what maximum angle will the lighter sphere swing.

2. Relevant equations
Conservation of mechanical energy
Conservation of momentum
Conservation of kinetic energy

3. The attempt at a solution

1. Calculate the height the small sphere is above the "rest" state. Use this height and conservation of mechanical energy to get the velocity.
2. Use conservation of momentum and conservation of kinetic energy to get the velocity of the larger and smaller spheres after the collision.
3. Use conservation of mechanical energy to get the new heights of the large and small sphere.
4. use trig to get the angles of each sphere.

Does that approach make sense?

Thanks.
Phys.Org News Partner Science news on Phys.org
Bees able to spot which flowers offer best rewards before landing
Classic Lewis Carroll character inspires new ecological model
When cooperation counts: Researchers find sperm benefit from grouping together in mice
Astronuc
#2
Oct3-07, 04:55 PM
Admin
Astronuc's Avatar
P: 21,827
That approach will work.

Here are some useful references -

http://hyperphysics.phy-astr.gsu.edu/hbase/elacol.html

http://hyperphysics.phy-astr.gsu.edu/hbase/colsta.html


Register to reply

Related Discussions
Question on impulse, does it assume elastic collision? Introductory Physics Homework 1
Elastic Collision - Symbolic Question Introductory Physics Homework 3
Elastic Collision question Introductory Physics Homework 4
Elastic collision General Physics 3
Elastic collision? General Physics 3