4. You have finally made the big time. You have landed a summer job with your aunt's landscaping company. You push a lawn mower along a level field of tall grass. The lawn mower has a weight of 500 N. Unfortunately, the mower is not self-propelled. Friction between the mower and the grass is 100 N. You push along the handle [note that the direction is down and inward, toward the mower] which makes an angle of 30 above the horizontal. You manage to push so that the mower moves with constant speed. a) With what force, Fpush, do you push the mower? b) What is the Normal Force, FN? 5. A 200 kg gorilla stands on a skateboard holding a bouquet of helium balloons. The balloons exert a 150 N upward force. The gorilla is pulled by a rope angled at 30 above the horizontal. Friction between the skateboard and the ground is 250 N. The force of friction is sufficient to keep the gorilla from accelerating. a) What is the tension, T, in the rope? b) What is the Normal Force, FN, acting on the gorilla? Bonus: For the problems #3,4,5 above,. find the coefficient of friction between the surface and the object? b) is this kinetic or static friction? Why