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The term acceleration can refer to a scalar acceleration or an acceleration vector. So far, we have only met scalar acceleration, e.g. 5 m/s 2. Vector acceleration is a scalar acceleration and a direction, e.g. 5 m/s 2 to the right.Treat acceleration as a vector when there is another vector quantity, such as velocity or force, involved. Forces need a size and direction, e.g. 300 N to the left.Momentum is equal to mass x velocity.o far, we have only met scalar acceleration, e.g. 5 m/s 2. Vector acceleration is a scalar acceleration and a direction, e.g. 5 m/s 2 to the right. Treat acceleration as a vector when there is another vector quantity, such as velocity or force, involved.
Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, a quantity that is measured in metres per second (m/s or mâs â1) in the SI (metric) system.or example, 5 metres per second is a scalar (not a vector), whereas 5 metres per second east is a vector. If there is a change in speed, direction, or both, then the object has a changing velocity and is said to be undergoing an acceleration.