# The pendulum

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• The pendulum
• Key terms
• Amplitude of the oscillation
• The distance from the equilibrium position to highest position on either side
• Time period
• The time taken for one complete cycle
• Depends only on the length of the pendulum
• Increases with length
• Equilibrium position
• The position of the pendulum when it stops moving
• Frequency of the oscillations
• The number of complete cycles of oscillation per second
• Details about a simple pendulum
• A simple pendulum consists of a mass, called a bob, suspeneded at the end of a string
• When the bob is displaced to one side and let go, the pendulum oscillates back and forth
• It does this through the equilibrium position
• Equilibrium position
• The position of the pendulum when it stops moving
• Oscillating motion
• A pendulum moves to and fro along the same line - this is an example of oscillating motion
• A playground swing is an example of oscillating motion
• If not pushed repeatedly, the swing will come to rest
• This is because energy is transferred due to friction at the top of the spring and due to air resistance