Simple harmonic motion
Simple harmonic motion is a type of periodic motion in which an object undergoes oscillatory motion. The restoring force exerted by the object exhibiting SHM is proportional to the displacement from the equilibrium position. The force is directed towards the mean position. We see many examples of SHM around us, common ones are the motion of a pendulum, spring and vibration of strings in musical instruments, and so on.
Simple Pendulum
A simple pendulum comprises a heavy mass (called bob) attached to one end of the weightless and flexible string.
Oscillation
In Physics, oscillation means a repetitive motion that happens in a variation with respect to time. There is usually a central value, where the object would be at rest. Additionally, there are two or more positions between which the repetitive motion takes place. In mathematics, oscillations can also be described as vibrations. The most common examples of oscillation that is seen in daily lives include the alternating current (AC) or the motion of a moving pendulum.
4. A bug is crawling very slowly along the second hand.
(a) Where would the tangential speed of the bug be the largest? Explain.
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90
Physics 100 Lab
Rotational Motion and Gravitation
PART A: Exploring Rotational Motion
Consider a standard wall clock, with an hour hand, a minute hand, and a second hand, as shown
below. All questions in this part refer to this situation. You
may assume that the clock is about 12in (30cm) wide.
1. Through how many degrees does the second hand move
every second?
11 12
10.
2. Through how many degrees đoes the minute hand move
3
every second?
3. (a) Through how many radians does the second hand move
every second? There are 2n radians in a circle.
4.
(b) What is the angular speed of the second hand in radians/second?
4. A bug is crawling very slowly along the second hand.
(a) Where would the tangential speed of the bug be the largest? Explain.
(b) How fast is the bug moving when it is moving its fastest? Explain.
(c) Is it possible for the bug to remain at rest while clinging to the second hand? Explain.
5. How does the angular speed of the hour hand compare to the angular speed of someone
standing on the Earth (as it spins on its axis)? Explain.
6. How does the angular speed of someone standing on the Earth (as it spins) compare to the
angular speed of the Earth traveling around the Sun? Explain."
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