surface tension associated with acceleration and change of momentum

by pollalis
Tags: acceleration, momentum, surface, tension
pollalis is offline
Nov27-09, 05:45 AM
P: 1
1. The problem statement, all variables and given/known data
I have an experiment which is described as: Float a water-soaked ping pong ball in a can of water held more than a meter from a rigid floor. Then drop the can. What happens to the ball as both drop (and what does his say about surface tension)? More dramatically, what happens to the ball, and why, when the can makes impact with the floor?

2. Relevant equations
acceleration: F=ma --> a=F/m
surface tension: γ=F/L (and to combine with the acceleration: (F=ma) so γ=ma/L
momentum in combination with surface tension: γ=Δρ/Δt*L

3. The attempt at a solution
When you do the experiment, the ball at the beginning is floating, when the can is dropped the ball comes out of the water for the free fall and then when the can comes crashing against the floor the ball goes in the water and then out, floating again on the surface.
So, the surface tension during the free fall decreases. But what happens after?
Phys.Org News Partner Science news on
Review: With Galaxy S5, Samsung proves less can be more
Making graphene in your kitchen
Study casts doubt on climate benefit of biofuels from corn residue

Register to reply

Related Discussions
Surface Tension ? Advanced Physics Homework 3
Three masses on a frictionless surface. Find Acceleration and tension. Introductory Physics Homework 1
help!!! surface tension Introductory Physics Homework 9
Centripetal acceleration, incorporating a change in acceleration around the circle... Introductory Physics Homework 3
surface tension General Physics 8