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#Post#: 540--------------------------------------------------
Extra Credit Opportunity!
DIR By: Tom Cruise
Date: December 1, 2017, 1:10 pm
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Another chance for EC, this time in the Lab Category...
At your home or somewhere else, I want you to calculate the
coefficient of Friction of a carpet acting on some sort of ball
(basketball, baseball, etc.). To do this, I want you to use a
make-shift ramp, which can be a folding table, or a larger
cardboard box, or plank, or a shelf, or spare piece of rain
gutter, whatever. Roll a ball down it, and let it roll across
the carpet. Here's the thing though- To prove you did it, you
must take some sort of video of what you are doing, and show me
when you turn in your work. This can be done on a cell phone,
ipad, whatever.
While doing this, the only data you are going to collect is
time: The time it takes the ball to roll down the ramp, and the
time it is rolling across the carpet. Here's a basic procedure
for you to follow:
1. Put the ramp at some angle and roll the ball down it,
starting a timer when you release it, and stopping it when the
ball reaches the bottom of the ramp.
2. Repeat the experiment from the same height, but this time,
start the timer when the ball reaches the carpet, and stopping
it when it stops moving.
The rest is a calculation. Set up your paper like you would a
homework, with a diagram at the top, and the distances and times
you're solving for. The two times can be used to find 2
distances, which can then be used in the big Work-Energy
equation to find the coefficient of friction.
As a bonus, you can also solve for the force of friction, but to
do that, you need to bring the ball you used in and get its
mass.
DUE FRIDAY DECEMBER 9TH!!!
#Post#: 541--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Tom Cruise
Date: December 3, 2017, 12:57 am
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--- Quote from: Mike Adamle link ---
>
> Another chance for EC, this time in the Lab Category...
>
> At your home or somewhere else, I want you to calculate the
coefficient of Friction of a carpet acting on some sort of ball
(basketball, baseball, etc.). To do this, I want you to use a
make-shift ramp, which can be a folding table, or a larger
cardboard box, or plank, or a shelf, or spare piece of rain
gutter, whatever. Roll a ball down it, and let it roll across
the carpet. Here's the thing though- To prove you did it, you
must take some sort of video of what you are doing, and show me
when you turn in your work. This can be done on a cell phone,
ipad, whatever.
>
> While doing this, the only data you are going to collect is
time: The time it takes the ball to roll down the ramp, and the
time it is rolling across the carpet. Here's a basic procedure
for you to follow:
> 1. Put the ramp at some angle and roll the ball down it,
starting a timer when you release it, and stopping it when the
ball reaches the bottom of the ramp.
> 2. Repeat the experiment from the same height, but this time,
start the timer when the ball reaches the carpet, and stopping
it when it stops moving.
>
> The rest is a calculation. Set up your paper like you would a
homework, with a diagram at the top, and the distances and times
you're solving for. The two times can be used to find 2
distances, which can then be used in the big Work-Energy
equation to find the coefficient of friction.
>
> As a bonus, you can also solve for the force of friction, but
to do that, you need to bring the ball you used in and get its
mass.
>
> DUE FRIDAY DECEMBER 9TH!!!
>
--- End Quote ---
I had to edit this- I originally asked for the force of
friction, but to get that, you must know the mass. You do not
need the mass, however, to solve for the coefficient of
friction.
#Post#: 542--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Diamond
Date: December 5, 2017, 8:56 pm
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What was the second formula for nonconservative force?
#Post#: 543--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Tom Cruise
Date: December 5, 2017, 9:05 pm
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--- Quote from: Diamond link ---
>
> What was the second formula for nonconservative force?
>
--- End Quote ---
? Not sure what you mean. Can you elaborate a little bit? Is
this for one of the homework problems?
#Post#: 544--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Sabre
Date: December 6, 2017, 9:42 pm
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Do we have to record all of our trials?
#Post#: 545--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Tom Cruise
Date: December 6, 2017, 10:07 pm
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--- Quote from: Sabre link ---
>
> Do we have to record all of our trials?
>
--- End Quote ---
Just on scratch paper. And remember, the only data you are
collecting is time, so just time it 3 times on the ramp, and
then time it 3 times while it rolls across the ground, and thats
it for data collection.
#Post#: 546--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Bronco
Date: December 7, 2017, 9:15 pm
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So as far as what we need to record, that is just time. Are you
certain we do not need to measure any distances of some sort?
#Post#: 547--------------------------------------------------
Re: Extra Credit Opportunity!
DIR By: Tom Cruise
Date: December 7, 2017, 9:20 pm
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--- Quote from: Bronco link ---
>
> So as far as what we need to record, that is just time. Are
you certain we do not need to measure any distances of some
sort?
>
--- End Quote ---
Yes and no. You could measure the length of the ramp and do
that. OR, you could drop the ball straight down from the top of
the ramp and find the velocity of the ball in free fall, OR, you
could use the time on the ramp, take a picture of the ramp
setup, and then use the picture and a protractor to find the
angle to figure speed. Any of these works.
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