10/30/13, Wednesday

Post date: Oct 31, 2013 12:20:8 PM

Bell Ringer

    • What is periodic motion?

Activities

    • Introduction to springs

    • Hooke's law mini-lab - due tomorrow

      • For each of two different springs, do the following:

        • Stretch the spring using a force scale. Record how far the spring was stretched, and how much force was required. Stretch a different amount and repeat for 10 data points.

        • Make a graph of F (in Newtons) vs. X (in meters)

        • Fit a line to your data

        • Calculate the slope of this line. The slope represents k, the spring constant for each spring

    • Hooke's Law

      • Fspring = - k x

      • The amount of force a spring applies to an object it is attached to is directly proportional to, and in the opposite direction as, the spring's displacement from its relaxed position

      • Page 371: 1-4 for practice

    • Introduction to simple harmonic motion

      • SHM is a special case of periodic motion

      • SHM is caused by a restoring force (a force that always pushed the object back toward its equilibrium position) which is proportional to displacement from equilibrium position

      • Examples of SHM:

        • A mass hanging from a spring

        • A pendulum

Practice

    • Page 371: 1-4

Assignments

    • Finish Hooke's Law Mini-Lab (due tomorrow)