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This lesson explains the difference between scalar and vector quantities, including how to add vectors and find the resultant force, as required by the Edexcel GCSE Combined Science specification (1SC0). Understanding scalars and vectors is fundamental to describing motion and forces correctly.
A scalar quantity has magnitude (size) only. It does not have a direction.
| Scalar Quantity | SI Unit |
|---|---|
| Distance | m |
| Speed | m/s |
| Mass | kg |
| Time | s |
| Energy | J |
| Temperature | K or °C |
| Power | W |
A vector quantity has both magnitude and direction.
| Vector Quantity | SI Unit |
|---|---|
| Displacement | m |
| Velocity | m/s |
| Acceleration | m/s² |
| Force | N |
| Momentum | kg m/s |
| Weight | N |
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