Unit 7- Energy Worksheet 3, Energy Bar Graphs

Transcription

1 Unit 7- Energ Worksheet 3, Energ ar Graphs Name Date # For each situation shown below: 1. Show our choice of sstem. **lwas include the earth in our sstem. 2. Show our choice of a reference level for measuring gravitational energ. 3. Label on our phsical diagram positions corresponding to our initial and final positions 4. Sketch the energ bar graph for position, the energ flow diagram from position to position, and the energ bar graph for position. 5. Write the energ equation that describes the initial and final energ of our sstem in the box provided. 1. In the situation shown below, a spring launches a roller coaster cart from rest on a frictionless track into a vertical loop. ssume the sstem consists of the cart, the earth, the track, and the spring, 2. Repeat problem 1 for a frictionless sstem which includes the cart, the earth, and the track, but not the spring. 3. Repeat problem 1 for the same sstem, but assume that there is friction between the cart and the track. Modeling Workshop Project 26/ TIME for PHYSICS FIRST 1 Unit 5, WS 5, Energ, v1.

2 4. This situation is the same as problem 1 except that the final position of the cart is lower on the track. Make sure our bars are scaled consistentl between problem 1 and 4. ssume the sstem consists of the cart, the earth, the track, and the spring. 5. Repeat problem 4 for a frictionless sstem which includes the cart, the earth, and the track, but not the spring. 6. Repeat problem 4 for the same sstem, but assume that there is friction between the cart and the track. 7. moving car rolls up a hill until it stops Do this problem for a sstem that consists of the car, the road, and the earth. ssume that the engine is turned off, the car is in neutral, and there is no friction. > v = = v > Modeling Workshop Project 26/ TIME for PHYSICS FIRST 2 Edited Jen Meer

3 8. Repeat problem 7 for the same sstem with friction. > v = = v > 9. person pushes a car, with the parking brake on, up a hill. ssume a sstem that includes the car, the road, and the earth, but does not include the person. > v = = v = 1. The person pushes the car up as it rolls down the hill. Y > V = Y = V = 11. load of bricks rests on a tightl coiled spring. Then it is launched into the air. ssume a sstem that includes the spring, the bricks and the earth. Do this problem without friction. > v > = v = Modeling Workshop Project 26/ TIME for PHYSICS FIRST 3 Edited Jen Meer

4 12. Repeat problem 11 with friction. > v > = v = 13. Repeat problem 11 for a sstem that does not include the spring. > v > = v = 14. crate is propelled up a hill b a tightl coiled spring. nalze this situation for a frictionless sstem that includes the spring, the hill, the crate, and the earth. > v > = v = 15. Repeat problem 14 with friction. > v > = v = Modeling Workshop Project 26/ TIME for PHYSICS FIRST 4 Edited Jen Meer

5 16. Repeat problem 14 for a sstem that does not include the spring. > v > = v = 17. bungee jumper falls off the platform and reaches the limit of stretch of the cord. nalze this situation for a frictionless sstem that consists of the jumper, the earth, and the cord. > v = > v = 18. Repeat problem 17 if the cord is not part of the sstem. Make our own bar graphs > v = > v = Modeling Workshop Project 26/ TIME for PHYSICS FIRST 5 Edited Jen Meer

6 19. n elevator, initiall at rest, begins to move and is then brought to rest as it reaches the ground floor. The sstem consists of everthing within the sstem boundar rectangle shown in the diagram. > v = = v = Sstem oundar 2. Create our own situation and construct corresponding energ bar graphs and energ flow diagram. Describe the phsical situation and the components of the sstems in the box below. Draw a diagram of the phsical situation. Diagram: Modeling Workshop Project 26/ TIME for PHYSICS FIRST 6 Edited Jen Meer