30 kg box is pulled at a constant speed of 0.40 m/s across a frictional surface with a force of 800 N. What is the frictional force on the box?
1 answer
Question:
30 kg box is pulled at a constant speed of 0.40 m/s across a frictional surface with a force of 800 N. What is the frictional force on the box?
Answers
The box moves at a constant speed, so its acceleration is zero. By Newton's second law, the net force acting on the box in the horizontal direction is zero:∑ F (horiz) = 800 N - f = 0where f is the magnitude of friction. It follows that f = 800 N.
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