PLTW Work & Energy (Math)

Work__Energy_-_Extra_Credit_2.docx

1. How much work (energy) is needed to lift an object that weighs 200 N to a height of 4 m?

2. How much power is needed to lift the 200-N object to a height of 4 m in 4 s?

3. What is the power output of an engine that does 60,000 J of work in 10 s?

4. Using the figure above Answer the following questions - The block of ice weighs 500 newtons.

a. What is the mechanical advantage of the incline?

b. How much force is needed to push it up the incline (neglect friction)?

c. How much work is required to push the block of ice up the incline compared to lifting the block 3m vertically?

5. Which block gets to the bottom of the incline first? Assume no friction. (Be careful!) Explain your

Answer.