Question
A hockey puck is hit on a frozen lake and starts moving with a speed of 14.4 m/s. 3.0 seconds later, its speed is 7.3 m/s.
(b) What is the average value of the coefficient of kinetic friction between puck and ice?
(b) What is the average value of the coefficient of kinetic friction between puck and ice?
Answers
First, find the acceleration:
7.3 = 14.4 - a*t
Substitute 3 seconds into the above equation to find the acceleration a. This acceleration is due to the force of friction = ckf*m*g
where ckf is the coefficient of kinetic friction, m is the mass of the puck, and g is the acceleration due to gravity
m*a = ckf*m*g
ckf = a/g
7.3 = 14.4 - a*t
Substitute 3 seconds into the above equation to find the acceleration a. This acceleration is due to the force of friction = ckf*m*g
where ckf is the coefficient of kinetic friction, m is the mass of the puck, and g is the acceleration due to gravity
m*a = ckf*m*g
ckf = a/g
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