WORK-Sheet
1. Cody was sitting on a chair watching Drake & Josh when his older cousin pushed him and his chair with a force of 2000 N, causing them to move 2 meters. (a) Calculate the work done by Cody’s big cousin. (b) How much power did the cousin use if she pushed Cody in 0.6 seconds?
2. Missy is at the roller rink, skating and minding her own business when Nick comes over and pushes her in the back with a force of 1500 N. The work that Nick does is 2000 J. (a) How far does Nick push Missy? (b) If Nick used 1333 W of power, how long did the push last?
3. Lucas and Hannah were having a grand time riding their quads when, sadly and unexpectedly, Hannah ran out of gas. She had to push her quad 50 m back to the garage. (a) If she ended up doing 30000 J of work, with how much force did Hannnah push? (b) If she used 1500 W of power, how long did it take Hannah to get to the garage?
4. During their annual dog-washing for charity, Aspyn, Emily and Sam try to get a stubborn Great Dane into the wash tub. Each girl pulls on the leash with 120 N of force, but the big dog pulls harder, and the girls end up on the ground. If the dog pulls the girls a distance of 3.5 m before they fall to the muddy ground, how much work did the girls (combined) do?
5. Devin hauled a large log over to the burn-pile last weekend from the woods behind his house. He took 26 seconds to pull the log a distance of 17 m. If he had to apply 450 N of force to move the log, how much power did he use?
6. Brandon uses a hoist to lift a car engine out of a car. The engine’s mass is 275 kg and it is lifted from the ground to a height of 1.4 m. (a) How much work does Brandon do on the engine? (b) If it takes him one minute to lift it, how much power does Brandon use?