For number 8a, why can't we just use 93N*3m to find the work? For example, this question:A 185 kg refrigerator is loaded into a van by moving it up a 10.0m long frictionless ramp that is at an angle of 11.0 degrees. How much work is done?all we have to do is find vertical distance and Fg then times it together, why does that method not work on the question in the picture?

Practice Problems now Show going 5. How much work does the force of gravity do when a 25-N object falls a distance of 3.5 m? 6. An airplane passenger carries a 215-N suitcase up stairs, a displace. ment of 4.20 m vertically and 4.60 m horizontally. a. How much work does the passenger do? 85 N 5 m 3m b. The same passenger carries the same suitcase back down the BSN same stairs. How much work does the passenger do now? 93 N 7. A rope is used to pull a metal box 15.0 m across the floor. The rope is held at an angle of 46.0 with the floor and a force of 628 N is 4m used. How much work does the force on the rope do? FIGURE 10-6. Use with Practice 8. A worker pushes a crate weighing 93 N up an inclined plane, push- Problem 8. ing horizontally, parallel to the ground, Figure 10-6. a. The worker exerts a force of 85 N. How much work does he do? b. How much work is done by gravity? (Be careful of signs.) c. The coefficient of friction is u = 0.20. How much work is done by friction? (Be careful of signs.)