Algebra Based Physics. Period and Frequency,
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1 Now that we are starting a new quarter, we will begin keeping a more organized Physics Notebook 1. Number the first 20 your pages on the bottom outside corner 2. On the top of page 1 write Table of Contents 3. On the first line write 4 and notes Algebra Based Physics Uniform Circular Motion 4. Open to page 4 and make a line down the page 2 inches from the left side Following along as we take notes Circular Motion In this chapter we will study the motion of objects traveling in circular paths. In previous chapters, we have considered objects at rest and objects moving in straight paths. and, What do you think are some of the differences are between 'linear' and 'circular' motion? Return to Table of Contents Circular Motion One of the main differences between linear and circular motion is that circular motion repeats! This difference can change the way we think about motion a little: For instance, instead of measuring the total time it takes for an object to get from point A to point B, we can measure the time it takes to go around a circle once. The time it takes for an object to complete one trip around circular path is called its. The symbol for is "T" s are measured in units of time we will use seconds (s). A B 1
2 Often we are given the time (t) it takes for an object to make a number of trips (n) around a circular path. In that case, The time The number of trips 1 What is the period of the second hand on a clock? A 60 seconds B 1 hour C 12 hours D it depends on the time Fjfz04 2 What is the period of the minute hand on a clock? 3 What is the period of the hour hand on a clock? A 60 seconds B 1 hour C 12 hours D it depends on the time A B C D 60 seconds 1 hour 12 hours it depends on the time s 4 If it takes 50 seconds for an object to travel around a circle 5 times, what is the period of its motion? 5 If a runner can make a full trip around a small track in 90 seconds, how much time would it take to complete 6 loops of the track? A.1 s A 6 s B 1 s B 15 s C 5 s D 10 s C 540 s D 900 s 2
3 6 If an object is traveling in circular motion and its period is 3.0s, how many revolutions will it complete in 1 minute? A 15 Another useful measurement in circular motion is how often a cycle repeats. B 20 C 30 D 60 The number of revolutions that an object completes in a given amount of time is called the frequency of its motion. The symbol for frequency is "f" and the units we measure with are "Hz" (hertz) Often we are given the time (t) it takes for an object to make a number of revolutions (n). In that case, 7 An object travels around a circle 50 times in ten seconds, what is the frequency (in Hz) of its motion? number of revolutions A 0.2 Hz The time A common example of frequency can be seen on the dashboard of a car, noting revolutions per minute (rpm) of the engine crankshaft. B 2.5 Hz C 5 Hz D 10 Hz. 8 If a wheel spins with a frequency of 8 Hz, how much time will it take to spin around 16 times? 9 If an object is traveling in circular motion with a frequency of 7.0 Hz, how many revolutions will it make in 20s? A 0.5 s B 1 s C 2 s D 4 s A 2.8 rev B 3.0 rev C 14 rev D 140 rev 3
4 and and We can relate them mathematically: These two equations look similar. In fact, they are exactly opposite one another. is the inverse of is the inverse of Another way to say this is that they are inverses An object has a period of 4.0s. What is the frequency of its motion? 11 An object is revolving with a frequency of 8.0 Hz. What is its period? A 0.25 s B 2.0 s C 4.0 s D 5.0 s A 0.10 s B 0.13 s C 4.0 s D 8.0 s 4
5 Attachments watch.webloc
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