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# Scalar And Vector Quantities

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### Scalar And Vector Quantities

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