Elastic collision question: two marbles

Tags: collision, elastic, marbles
GFWD is offline
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?

Phys.Org News Partner Science news on Phys.org
Scientists pinpoint when harmless bacteria became flesh-eating monsters
Asian air pollution affect Pacific Ocean storms
Rocket leak delays space station delivery launch (Update)
Astronuc is offline
Oct3-07, 04:55 PM
Astronuc's Avatar
P: 21,625
That approach will work.

Here are some useful references -



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