Names:Per____

Pendulum Lab Make Up

Problem

How do various factors affect the behavior of a pendulum?

Pendulum cord length

Mass of Bob

Part I Comparing Mass

  1. Secure cord with no extra mass (washers) to pivot
  2. Record length of cord from pivot to bottom of bob in meters 0 .62m
  3. Start pendulum swinging by releasing at 30º.
  4. Record the total time to complete 5 complete swings. (back and forth). Record time, then repeat twice

Time 1: 8.03 s

Time 2: 7.96 s

Time 3: 7.84 s

Ave Total Time: ______

  1. Use Ave Total Time to calculate Period (Ave Total Time/5cycles) Period:______.
  2. Slide all washers to bottom of bob. Make sure the length of the cord is the same as in IB:0.62m .
  3. Start pendulum swinging by releasing at 30º.
  4. Record the total time to complete 5 complete swings. (back and forth). Record time, then repeat twice

Time 1: 7.87 s

Time 2: 7.98 s

Time 3: 7.83 s

Ave Total Time: ______

  1. Use Ave Total Time to calculate Period (AveTotal Time/5cycles) Period:______.
  2. How did the period of the pendulum change when mass was changed? Did other groups see the same result?

Part IIComparing Length

  1. Use cord with all washers at the bob
  2. Record length of cord from pivot to bottom of bob in meters0 .69m
  3. Start pendulum swinging by releasing at 30º.
  4. Record the total time to complete 5 complete swings. (back and forth). Record time, then repeat twice

Time 1: 8.23 s

Time 2: 8.14 s

Time 3: 8.17 s

Ave Total Time: ______

  1. Use Ave Total Time to calculate Period (Ave Total Time/5cycles) Period:______.
  1. Nowshorten the length of the cord to approximately 1/23 of the original.Record length of cord from pivot to bottom of bob in meters0 .46m
  1. Start pendulum swinging by releasing at 30º.
  2. Record the total time to complete 5 complete swings. (back and forth). Record time, then repeat twice

Time 1: 6.23 s

Time 2: 6.64 s

Time 3: 6.46 s

Ave Total Time: ______

  1. Use Ave Total Time to calculate Period (Ave Total Time/5cycles) Period:______.
  2. How did the period of the pendulum change when length was changed? Did other groups see the same result?

Part III Calculating Gravity

  1. Look at your data. Which set of total times were the most precise (repeatable)? What was the corresponding period?______What was the corresponding length of the pendulum?______
  2. Use these values and calculate the acceleration of gravity using the pendulum formula.

Experimental acceleration of gravity:______(show work below)

  1. Determine your error from the accepted value of 9.8 m/s2: ______(show work below)

_

%Error = Accepted-Experimental X 100

Accepted