Tuesday May 12Frequency and Period

Warm up: (from yesterday’s lab)If you are making a grandfather clock pendulum, should you be most worried about mass, length or amplitude. Why?

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NOTES

Due Today– Tick-tock mini-lab

(if you didn’t turn it in yesterday)

Homework– Frequency and period half

sheet

Equations

T = 1/f

f = 1/T

Period for a Pendulum

NOTES

If T = 3 seconds, what is f?

Example 1:NOTES

Ans: 0.333 Hz

If f = 4 Hz, what is T?

Example 2:NOTES

Ans: 0.25 sec

If f = 0.4 Hz, what is T?

Example 3:

Ans: 2.5 sec

Example 4:

Monique jumps rope in order to train for basketball season. If the rope hits the ground underneath her every 2.2 seconds, what is the frequency of the rope?

Ans: 0.45 Hz

Example 5:

Edo plays the drums, and does a drumroll that has a frequency of 12 Hz. How much time is there in between drum beats?

Ans: 0.083 sec

Example 6:

Length = 3 metersGravity = 9.8 m/s2

What is T of the pendulum?

Ans: 3.47 sec

Example 7:

Length = 0.25 meters

What is T of the pendulum?

Ans: 1.004 sec

Example 8:

Jakere pushes her cousin on a swing. If the length of the swing is 2 meters, what is the PERIOD?

How can she verify her calculation?

Ans: 2.83 sec

Ans: use a stopwatch to measure it