January 6AP Physics

In:How would the period of a pendulumon earth differ from that on the moon?

Objective: Find out the relationship between period and length of a pendulum.Success criteria:to be able to explain the equation for the period of a pendulum

Lab: period of a pendulum

Problem: what are the variables that affect the period of a pendulum?

• List possible variables• Test possible variables• From your data, determine what the

variables are that affect the period of a pendulum.

• What are the relationships between the variables?

Now that we’ve determined what variables affect period… what is the relationship?

Tα ?

Tα L

Tα 1/L

Tα L2

Tα√L

Direct relationship: graph is a straight line Y α X

Inverse relationship Y α 1/X

• Plot the reciprocal to get a straight line.

Power relationship Yα X2

• Square the x axis values

Root relationship Y α √X

Plot the square root of the x values to get a straight line.

What relationship have you found?

Pendulum:

T=2π√l/g

l=length of pendulumg=acceleration due to gravity:

9.8 m/s2

A clock has a pendulum with a length of .5 meters. What is the period of the pendulum?

How long a pendulum do you need to make a clock goes tick-tock every second?

Synthesis:I own/ I don’t understand

Out:How is simple harmonic motion similar to a

wave?