On the Dependency of Friction on contact area and mass – Bilkent University PHYS 101 lab project

On the Dependency of Friction on contact area and mass – Bilkent University PHYS 101 lab project


Hello everyone. In our freshman physics 101 lab
project, we are investigating the dependency of friction force on contact
area and mass. So, to do that we’re sliding a block down an inclined plane
with a fixed inclination angle. Theoretically we can show that friction force should be
independent from the contact area and linearly dependent on mass in a positive
way so at first we are calculating the implantation angle theta by measuring
the base and height of the implant pin and applying simple to abilities such as
theta is equal to tan inverse height bible’s then here we are keeping the
mass of the Odin dog with the surface constant and buy additional by adding
additional weight so here as you can see we are adding additional weight as
necessary to keep the mass of the two surfaces same oldest to the surface of
100 centimeter square and slide it down from the top of inclined pin we are also
with keeping the record of the time taken by the dog to travel the length of
the plane and yes as you can see in tubes one point one four nine four
second and then we are changing the contact area now we’re going to repeat
the previous step for various contact areas we will have repeat the experiment
four five times with several contact areas so after conducting the experiment
with several areas we will conduct experiment with several masses true
first we’re sliding the block down without any additional mass then whoever
slide the block with 50 gram additional mass and in each case were recording
that time because we need that the time data to calculate the acceleration and
hence the force of friction so here now we’re repeating next
for various masses so putting the fellow of the recorded time in this equation we
can calculate the force of friction for various masses and various contact areas
so as you can see in the plot of friction force versus contact area it is
nearly horizontal so we can safely say there is no relation between seats at
first and a contact area and in the graph of friction force versus mass the
plot will observe it has a positive slope and the y-intercept is zero so we
can say that there is a positive relation of fixed and force and mass
thanks everyone for watching

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