momentumA quantity relating to a moving object that is calculated by multiplying its mass by its velocity. is the product of massThe amount of matter an object contains. Mass is measured in kilograms (kg) or grams (g). and velocityThe speed of an object in a particular direction.. Momentum is also a vectorA vector describes a movement from one point to another. A vector quantity has magnitude (size) and direction. quantity – this means it has both a magnitudeThe size of a physical quantity. and an associated direction.
For example, an elephant has no momentum when it is standing still. When it begins to walk, it will have momentum in the same direction as it is travelling. The faster the elephant walks, the larger its momentum will be.