# Calculating the speed of a swinging pendulum bob

For example, the earth's pull on an individual will depend on whether the person is, say, on the beach or far out in space. Intrigued, Galileo decided to measure how much time it took for each swing, using the only approximately periodic event to which he had ready access: If two forces are not collinear, they cannot possibly cancel out. From the law of conservation of energy: Create another calculated column and name it KE.

## Simple Pendulum

So, for example, if we look at the circle from below, as if we were looking along the plane of the screen from below, we would only see the x-displacement of the object, as the y-displacement would be invisible to us. He found something interesting: We have a displacement, , and it is proportional to the acceleration , but the acceleration acts in the opposite direction to the displacement. This experiment was safety-checked in November From the law of conservation of energy: The greater the amount of the unbalanced force, the more rapidly a given object's speed or direction of motion changes; the more massive an object is, the less rapidly its speed or direction changes in response to any given force.

### Exploring Pendulums - Science NetLinks

Galileo's interest in pendulums is generally believed to have started when he was sitting in the Cathedral at Pisa, Italy. In the previous part of this lesson , we investigated the sinusoidal nature of the motion of a mass on a spring. What are the solutions to the second order differential equation? Have the remainder of the class match term to definition by voting. The kinetic energy possessed by an object is the energy it possesses due to its motion. The animation at the right used with the permission of Wikimedia Commons ; special thanks to Hubert Christiaen provides a visual depiction of these principles. Count the votes and write the totals on the board.
This demonstration allows you to measure the period of oscillation of a pendulum. Fill in your details below or click an icon to log in: Students should already know that the earth's gravity pulls any object toward it without touching it. Next the bob moves rightward along the arc from G to F to E to D. Anna Litical wishes to make a simple pendulum that serves as a timing device.
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