Harmonic+Motion+3

Physics with Math -> **Harmonic Motion 3** Previous Next

media type="custom" key="9494656" **Questions:** (answers below) > What changes? What doesn't change? > What changes? What doesn't change? It is a challenge to make this pendulum. It took me several tries to get it to work correctly. Try it yourself now or later after we first make a simulator for a spring.
 * * Use the slider to change the ** start angle **, but not the string length and look at both parts of the interactivity.
 * How can I check whether the period (cycle time) T depends on the start angle?
 * Use the slider to change the ** string length **, but not the angle and look at both parts of the interactivity.
 * How can I check whether the period (cycle time) T depends on the string length?
 * Calculate T and test to see if the interactivity is fairly accurate for a couple of different pendulums. ||
 * On to Springs, Hooke and Harmonic Motion. Let's go! **

Answer: Changing the start angle changes the width of the swing. This changes the amplitude (height) of the wavy curve. However the period (number of wavy curves in 10 s) does NOT change so the time it takes for the ball to go from one side to the other and back does NOT change. So a larger start angle must mean the ball is moving faster (why?) Answer: I can make a table with different angles and measure the time it takes to make 5 cycles (or 1 cycle if you are really good with the stopwatch).

Answer: Changing the string length changes the period? However, the amplitude does NOT change. So a longer string must mean the ball is moving faster or slower? Answer: I can make a table with different string lengths and measure the time it takes to make 5 cycles (or 1 cycle if you are really good with the stopwatch). If I test and find that T1 is twice as big as T2, what is the ratio between length1 and length2. Answer: Should be fairly good, but depends on your computer too. To change the speed, right-click on slider t and on the animation tab increase or decrease the speed.