I suck at word problemsgah gr.11 PHYSICS problem.
A croquet ball was a mass of 300g (0.3kg) is thrown with a initial velocity of 6.0m/s [right] a force of friction of 0.45N causes the ball to come to a stop. How long does it take the ball to roll to a stop?
So you want to find time in this question...but no matter what I do I need either the acceleration, distance or the force applied.
It probably worded it oddly and the answers right there, last ditch effort I'm guessing force of gravity = normal force, and since your throwing the ball the normal force would be the applied force...but that sounds wrong.
Anyways given:
V1= 6m/s
V2= 0m/s
m=0.3kg
Ff=0.45N
t= ?
HELP
March 30, 2011
3 Comments • Newest first
This problem could be potentially difficult given how poorly they designed it. Since the ball is rolling, you should be considering the kinetic energy of its linear path in addition to its angular spin. Given that this is Gr. 11, you would never be expected to analyze it as such (plus the given info wouldn't allow you to).
Anyway in the scope of the problem, you want to find the acceleration using the methods described above. After that it becomes a simple kinetics problem.
V2 = V1 + a(t)
Well if friction is the only horizontal force you can use it to find acceleration using F=ma. After you find a you can use the formula a=[(V2-V1)/t] to find time.
F = -.45N
A = F/M
Enjoy