12th Physics
A 55 kg ice skater is at rest on a flat skating rink. A 198 N horizontal forceis needed to set the skater in motion.However, after the skater is inmotion, a horizontal force of 175 N keeps the skater moving at a constantvelocity. Find the coefficients of static and kinetic friction between theskates and the ice.
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Answers
The coefficient of static friction is the maximum force someone can apply to an object before it starts to move. This can be calculated by dividing the 198 N (the force needed to set the skater in motion) by the mass of the skater (55 kg): Coefficient of static friction = 198 N / 55 kg = 3.6 The coefficient of kinetic friction is the force required to keep an object in motion. This can be calculated by dividing the 175 N (the force required to keep the skater moving) by the mass of the skater: Coefficient of kinetic friction = 175 N / 55 kg = 3.2 Therefore, the coefficient of static friction is 3.6 and the coefficient of kinetic friction is 3.2.
