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srosrguezbracho
03.12.2020 •
Physics
A block wełghing 300 N is moved at a constant speed over a horizontal
surface by a force of 50 N. What is the coefficient of friction? *
1 point
A. 0.25
OB. 0.50
C. 0.10
D. 0.17
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Ответ:
D) miu = 0.17
Explanation:
To be able to solve this problem we must perform a sum of forces in the direction of the movement. This sum of forces must be equal to zero, since the block moves at a constant speed, therefore there is no acceleration.
The friction force is defined as the product of the normal force by the coefficient of friction.
where:
f = friction force = 50 [N]
miu = friction coefficient
N = normal force [N]
Now the normal force is defined as the force with equal magnitude to the weight of the block but acting in the opposite direction.
Now replacing:
Ответ:
the 3 to the 2nd= aswer B
Explanation: