Question

When is the relation (δp) = m (δv) true

Answer 1

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• As long as the mass part of the momentum does not change, the change in momentum can be expressed as Δp = Δ(mv) = m(Δv).

• Because we define acceleration, a, as the change in velocity with time a = Δv/Δt, Newton's second law can also be written as F = ma.

• This is a more familiar expression to anyone who had a physics course before.

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[ Since the acceleration a relates to Δv, and Δv is not zero if the direction of v changes even when its size stays the same, an object accelerates if its direction of travel changes while it is moving at constant speed.]

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Answer 2

Answer:

As long as the mass part of the momentum does not change, the change in momentum can be expressed as Δp = Δ(mv) = m(Δv).

Because we define acceleration, a, as the change in velocity with time a = Δv/Δt, Newton's second law can also be written as F = ma.

This is a more familiar expression to anyone who had a physics course before.