Question

I need help with a kinetic friction lab... We set up a level cart track with a motion detector at one end and then gave a wooden block a push on the track towards the motion sensor to measure the deceleration of the block. How do I calculate the kinetic coefficient using our measured results? The block weighed 131.1g. The slope of the velocity graphs for our 3 trials were 3.73, 2.72 and 2.9 m/s/s.

Answer 1

The slope for three trials are 3.73, 2.72 and 2.9

these are the value of acceleration

here friction force is providing the negative acceleration

so Net force = friction force

mass * acceleration = coefficient of friction * Normal force

for the first trial

for the second trial

for the third trial,

these are the values of the coefficient of friction

we can take an average of them to find out one approximate value