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What is sound?

A basic explanation of sound: what it is, how it travels, how you characterise sounds (frequency, wavelegth and intensity) and how they are made.

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Displacement-Time Graph and Velocity-Time Graph

This simulation shows two graphs where the user can vary initial displacement, velocity and acceleration and see the corresponding changes to the Displacement-Time and Velocity-Time Graphs.

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Constant Negative Velocity

Shows, by means of simple animation, the displacement time, velocity time, and acceleration time graphs for an object moving at constant negative velocity.

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Hits: 2848

Constant Positive Velocity

Shows, by means of simple animation, the displacement time, velocity time, and acceleration time graphs for an object moving at constant positive velocity.

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Hits: 3404

What is Time?

Find out how scientists at the National Physics Laboratory study time.

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Hits: 217

Conversions - Time

This site allows you to convert between a wide variety of Time units.

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NPL Beginners' Guide - Atomic Timekeeping

An introduction to time keeping and how time is agreed around the world.

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Hits: 3637

How can you lift four times your weight?

Build your own lever and see one in action.

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Hits: 2572

Reaction Times

An applet which allows the user to see how a car stops given certain braking conditions.

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Hits: 5235

Introduction to sound

The basics of sound waves, including really useful animations of how sound travels

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