2/18 Physics Class and homework due 2/15

Hi folks,

Today we got a bit deeper in our journey to understanding energy by getting into the concept of work.  We will be getting a bit deeper into this as we use the concept to explore simple machines next week.

For homework this week:

Read pages 103 - 110 in the text.

Do questions 1 - 5 on page 119

Also, answer the following questions.  (Some are from the book, some are from last week's lecture.)

1.  What is the definition of work?



2.  What is the definition of power?



3.  What unit do we use for work?  



4.  What unit do we use for power?



5.  What is a Newton?



6.  Name 5 different types of energy?



7.  Describe a scenario where energy is changing forms at least 4 times (like the toaster scenario we did last week).



8.  How is work different from power?



9.  If a forklift is replaced with a new forklift that has twice the power, how much greater a load can it lift in the same amount of time?  If it lifts the same load, how much faster can it operate?



10.  Today we went outside and pushed my car.  What did that have to do with work?  What did it have to do with power?


11.  Using your numbers, what work did you do on my car?


12.  Using your numbers, what was your power?


13.  If, instead of pushing my car you pushed a wheel barrow that took 50 N to push, how far could you push that wheelbarrow using the same amount of energy you used to push the car?


14.  In the formula W=FD, what is the relationship between work and force (is it inversely or directly proportional)?


15.  In the formula W=FD, what is the relationship between force and distance  (is it inversely or directly proportional)?


16.  If work stays the same but the force it takes to move an object doubles, what happens to the distance it can be moved?












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