The Treadmill is a space saving
device for a fitness center to allow them to
acquire many of these machines instead of a
large running track. So when people take
their jog, run, or sprint on this machine what
ensure that they do not slip on the belt?
Well this magical force is known as
friction. Friction acts against the object
in motion (unless unusual circumstances)
and pushes against it. On a treadmill the
friction mainly pushes against the feet of the
runner. One would be able to calculate the
force of friction using the equation ľk Fn =
Ff. The ľk is the coefficient of friction
that is unitless, Fn is the natural force, and
Ff is the frictional force. The natural
force is the force that counteracts an objects
force created by gravity so it doesn't fall to
the center of the earth, so on a flat surface it
is equivalent to m*g. Lets assume the
coefficient of friction is 0.25 and the runner
weighs 50 kg. So the friction force would
be (0.25*(50kg*9.81m/s^2)=) 122.625
Newtons.
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