Pendulum Problems
ACTIVITY 1: Copy and paste the example problem and the steps, so that the steps are in the correct order into a new Word document and upload it to Moodle. Example Problem 1: A hypnotist swings her watch from 20.0cm chain in front of a subject’s eyes. What is the period of the swing of the watch. Thus, we see that the pendulum used by the hypnotist has a period of 0.898s.| Before we can use this formula, however, we must ensure all our variables are in the correct units. The length variable in this formula should be in meters, however our length is in centimeters. Converting centimeters to meters we get:.| We know that a watch swinging back and forth on a chain is a form of a pendulum and that the length of that pendulum is 20.0cm. Also, since we are assuming that the hypnotist is on Earth, we know that the acceleration due to gravity is 9.8m/s2.| Now we are ready to plug into the formula and simplify to get our answer:.| Fortunately, there is a formula specifically for finding the period of a pendulum. We will use the original version of this formula, since it is already solved for T:.| We want to find the period at which a watch swings back and forth on the end of a chain.|

Example Problem 2: A spider swings in the breeze from a silk thread with a period of 0.6s. How long is the spider’s strand of silk? To solve this we use the formula for the period of a pendulum. Since we are trying to find the length, we use the version of this formula that is solved for L:.| We can see that the spider at the end of the strand makes one complete swing, back and forth, every 0.6s.| Plugging in and simplifying, we get:|

Thus, we now know, that the length of the spider’s silk is 0.089m.| We want to know how long a strand of spider’s silk is.|

ACTIVITY 2: Write up an explanation, similar to the ones you unscrambled in activity one, to the problem below using the work for the problem shown below. Do this on your own paper....

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Free Fall
Rachel Shea
Physics 131 Lab, QL
Hasbrouck 210
Sept. 21, 2014
Abstract
This experiment measures the study of motion by observing the force of gravity acting solely upon an object, and also measures reaction time. If an object is in free fall, the only force acting upon it is gravity. The object used in this experiment was a golf ball that provided some acceleration when dropped. A sensor positioned underneath a table recorded the golf ball’s pattern of motion,...

...seatbelts, air bags, crumple zones, and etc. are introduced. Safety devices such as seatbelts, air bags, crumple zones and etc are designed to reduce the forces on the body if there is a collision. These safety devices are mostly made based on the physics principle of force and momentum, which is
This relationship says that if momentum is transferred over a longer period of time, the force involved is less. If the force of a collision can be reduced, then the chances that...

...Abstract:
The students investigated about freezing point depression and at what temperature the substance changes states. The students used the freezing point depression to find the molar mass of benzoic acid. First they heated lauric acid to determine the temperature that the freezing point of the solvent is and then compared the temperature to that of the lauric acid/ benzoic acid solution. They then took the change in temperature in order to determine the molality of the benzoic acid,...

...Is gravity always 9.8m/s2??
INTRODUCTION: A simple pendulum consists of a mass m swinging back and forth along a circular arc at the end of a string of negligible mass. A pendulum is a weight suspended from a pivot so that it can swing freely. Gravity is the pull that two bodies of mass exert on one another. There are several simple experiments that will allow you to calculate the acceleration due to gravity of a falling object. A simple pendulum can...

...EXPERIMENT 2 Measurement of g: Use of a simple pendulum
OBJECTIVE: To measure the acceleration due to gravity using a simple pendulum.
Textbook reference: pp10-15
INTRODUCTION:
Many things in nature wiggle in a periodic fashion. That is, they vibrate. One such example is a simple pendulum. If we suspend a mass at the end of a piece of string, we have a simple pendulum. Here, the to and fro motion represents a periodic motion used...

...One
Title: Determination of the acceleration due to gravity with a simple pendulum
Introduction and Theory: A simple pendulum performs simple harmonic motion, i.e. its periodic motion is defined by an acceleration that is proportional to its displacement and directed towards the centre of motion. It can be shown that the period T of the swinging pendulum is proportional to the square root of the length l of the pendulum: T2=...

...Using a Pendulum to Determine g
Aim: To determine the rate of acceleration due to gravity using the motion of a pendulum.
Hypothesis: The numerical g value measured on earth is estimated to be 9.8 ms-2
Apparatus:
* Retort Stand
* Boss head and clamp
* Approximately 1 metre of string
* 50g mass carrier or pendulum bob
* Stopwatch
* Metre ruler
Theory:
When a simple pendulum swings with a small...

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Pendulum
Raiyan Hassan
SPH3U
September 20, 2011
Introduction
A pendulum is a device which consists of a mass attached to a string from a frictionless pivot which allows it to swing back and forth. In this experiment, the time it takes for a pendulum to go through a period is going to be measured. The time it takes for a pendulum to go through one period can depend on factors such as the length of the string, mass, or...