Finding the coefficient of friction (mew) DUE TOMOROW

[newton2008]

Finding the coefficient of friction (mew) DUE TOMOROW :(

Our physics class went curling, and this is the data we had to collect..

Without Sweeping

Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Trial 7
Time (s) 21.37 21.70 21.65 21.95 20.47 20.69 22.30
Distance (m) 115.50 145.50 125.50 112.00 28.00 28.50 261.50

With Sweeping

Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 Trial 7
Time (s) 22.06 20.75 24.31 21.50 22.13 21.87 18.15
Distance (m) 147.00 75.50 320.00 18.00 255.00 198.00 42.00

Distances are measured past the second hog line, add 868 inches, and convert to metres.

Mass of Stone = 20 kg (2 sig. digs)
1 ft. = 0.3048 m

One of the question asks to: Calculate the average coefficients of friction with and without sweeping.

So I calculated the Fn = (20)(9.81) = 196.2 N

But the Force of Friction = (mew) * (Fn)

How am i supposed to find the force of friction? So then i can find the (mew)

someone pleaseeeee help

 

[scottie_000]

i suppose you could assume the decceleration due to friction was linear in time so, knowing the final speed, time and distance, you could calculate the decceleration and hence the force using the "vusat" equations

 

[Moetasim]

I would recommend starting by organizing the data into a table or graph to better visualize the relationship between time and distance for both trials. From there, you can calculate the average speed for each trial by dividing the distance by the time. This will give you a better understanding of how the sweeping affected the speed of the stone.

To find the force of friction, you will need to use the equation Ff = μFn, where μ is the coefficient of friction and Fn is the normal force. In this case, the normal force is the weight of the stone, which you have already calculated as 196.2 N. So, by rearranging the equation, you can solve for μ by dividing the force of friction by the normal force.

It is important to note that the coefficient of friction can vary depending on the surface and conditions, so your results may not be exactly the same as those of other groups. However, by calculating the average coefficient of friction for both trials, you can compare the effectiveness of sweeping in reducing friction. I suggest also considering other factors that may have affected the results, such as the technique used for sweeping and the surface of the ice. Good luck with your calculations and analysis!