Use the GUFSA steps to solve the following word problems.

1. A 79-kg sofa is found at the side of the living room. How much force does the floor exert on the sofa?



2. A rolling bowling ball has an acceleration of 1.88m/s2 when released with a 13.72-N force. How heavy is the bowling ball?




3. A 25 kg girl sitting on a carousel is moving at a speed of 4.0 m/s. If the girl is 5.0 m from the axis of the carousel, what is the centripetal force that maintains her circular motion?​



4. A young boy applied a force of 2,550 N on his St. Bernard dog who is sitting on the boy's tennis shoes. He was unable to move the dog. How much work did he do trying to push the dog?