A sled is pulled at a constant velocity across a horizontal slippery surface. If a force of 230.0 N is being applied to the sled rope at an angle of 48.0 degrees to the ground, what is the magnitude of the force of friction of the surface acting on the sled?

6. A basket is held aloft by a balloon that exerts an upward force of 8600 N on the basket. The gravitational force acting on the basket is 2250 N. What is the magnitude and direction of the force that a winch must exert on a rope attached to the basket to keep it from rising?

7. A 15.0 kg box is sliding down a 25.0 degrees slope with a constant velocity. What is the friction force?