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# Scalar And Vector Quantities

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### Transcript

• 1. Scalar and vector quantities
• 2. Mass
• Mass is the amount of ‘stuff’ - measured in kilograms
• It is a scalar quantity because it is fully described by a size
• 3. Weight
• Weight is a vector quantity because it has direction ( the weight of an object pushes down due to gravity)
• 4. Speed
• This is a scalar quantity because it is fully described by a size
The mir space station orbits the Earth at great speed – but it has no velocity because it is going nowhere
• 5. Velocity
• Velocity is a vector quantity because it has direction
At launch, the space shuttle has both speed and direction – so it has velocity
• 6. Scalar or vector ?
• An astronaut floating in space ?
• A champagne cork popping ?
• A cyclist going round a circular track ?
• A cyclist in the tour de France ?
• A weather satellite ?
• A stationary bus ?
• 7. Homework
• Make a list of 5 things that are:
• Vector quantities
• Scalar quantities
• Do not use any examples from today's lesson