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Coefficient of Kinetic Friction ... using Spring information?
Calculate the coefficient of kinetic friction between a 4.82 kg block and the horizontal surface on which it rests if an 82.3 N/m spring must be stretched by 2.21 cm to pull it with constant speed. Assume that the spring pulls in a direction 13.4° above the horizontal.
2 Answers
- 8 years agoFavorite Answer
The horizontal pulling force must balance the friction force for constant speed
So the friction force is
f = k*x*cos(13.4) = 82.3*0.0221*cos(13.4) = 1.77 N
So the coeff of kinetic friction is
μk = f / m*g = 1.77 / (4.82*9.81) = 0.0374
- orinLv 45 years ago
because the fabric grow to be shifting at a consistent stress, the internet stress grow to be 0. hence, the stress of friction equals the stress you study on the spring scale. it really is the formula for kinetic friction: Ff=?Fn the position Ff is the stress of friction, ? (mu) is the coefficient of kinetic friction, and Fn is the conventional stress. Fn is the stress of the table on the fabric, it really is equivalent yet opposite to the stress of the fabric on the table. You calculate it with Fn=ma. m is the mass of the fabric and a is acceleration as a results of gravity, 9.8 m/s^2
