(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A steel ball of mass m falls from a height h onto a scale calibrated in newtons. The ball rebounds repeatedly to nearly the same height h. The scale is sluggish in its response to the intermittent collisions and displays an average force Favg, such that FavgT = FΔt, where FΔt is the impulse that the ball imparts to the scale during the brief time Δt of each collision, and T is the time between collisions.

Calculate this average force in terms of m, h, and physical constants.

2. Relevant equations

momentum principle, delta(p)=Fnet delta(t)

update position, delta(r)=v(initial)delta(t) + a/2*delta(t)

delta(r) = v(avg)delta(t)

v(f)^2 =v(i)^2 +2a(∆x)

3. The attempt at a solution

use second equation

h=g/2*T^2 then rearange to get T= sqrt(2h/g)

(I think theres initial velocity, but I need help computing it)

that can be plugged into the final equation for T

I'm sort of lost on how to convert the impulse into different units and need help on this also

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Momentum hw problem, steel ball dropped from h

**Physics Forums | Science Articles, Homework Help, Discussion**