Using a rope, a child pulls a box across a rough floor at a constant speed. The tension in the rope is 105 N and the rope makes an angle of 37 degrees with the horizontal. Find the friction force acting on the box (due to the rough floor).

1 answer

the rope is pulling, and lifting ...

forcelifting=105sin37
force pulling=105cos37

forcepulling-frictionforce=ma=zero

the problem is too easy...friction force=pulling force.