9/8/10

Post date: Sep 08, 2010 5:38:38 PM

  • Quiz 4 - constant acceleration equations

    • How to set up constant acceleration problems

      1. (optional) draw the final and initial state with velocities and distances labeled.

      2. Write out given info in table format:

        • Fill in each space with:

          • the value, if given

          • "?" if asked for

          • "X" if not given and not asked for

      1. Select which equation to use, using the following table:

        • Use the equation with the same variable xed out as your given information

      1. Use algebra to rearrange the equation to find the variable you are asked to find.

      2. Plug in numbers (with units) and do the calculation.

      3. Check that units come out correctly, round to correct number of sig digs, and think about whether your answer makes sense (no 30,000 m long flutes!)

    • Acceleration due to gravity

      • Near Earth's surface, acceleration due to gravity is 9.80 m/s/s downward.

      • In problems where an object is in freefall (gravity is the only force acting on an object), acceleration for the object is -9.80 m/s/s .

    • Page 77: 25, 27-30