I'm a little confused near the end of this experiment when they solve for the force exerted on the block by the string (the pulling force) to be 0.63 N and then they say the frictional force is 0.63 N as well. What is the reasoning behind this? Here is the link again...
I am currently working on an experiment to find the kinetic friction in a driveline. The experiment uses the principle of conservation of energy and is based on the following experiment: http://hyperphysics.phy-astr.gsu.edu/HBASE/Class/PhSciLab/frictionex.html
The difference in my proposed...