Module 3—Effects of Force on Velocity

Read

 

In the elevator lab, you were dealing with a hypothetical frictionless surface. In the next assignment question you will have kinetic friction on a slope. Read “Kinetic Friction” on pages 176 to 179 of your textbook. Compare the example there with “Example 3.18” on page 186 and “Example 3.20” on pages 188 and 189 of your textbook. Do you see a similar pattern?

 

Module 3: Lesson 5 Assignment

 

Remember to submit the answer to TR 5 to your teacher as part of your Module 3: Lesson 5 Assignment.

 

Try This

 

TR 5. In “Example 3.16” on page 179 of your textbook and in the text titled “Example Problem 4: On an Incline” that you studied in the first part of this lesson, the did not enter into the calculations. However, the was part of the calculations in “Example 3.18” and “Example 3.20.”

  1. Why was needed in the last two examples but not the first two?
  2. What formula was used to calculate ?