Scalar vs Vector Quantities and Newton's Laws

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11 Terms

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Scalar

Only magnitude.

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Vector

Magnitude and direction.

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Examples of scalar quantities

Speed, mass, energy, time.

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Examples of vector quantities

Force, velocity, displacement, acceleration.

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Equation for weight

W = m g.

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Newton's 2nd Law equation

F = m a.

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Resultant force

Single force that represents all acting forces combined.

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Newton's 1st Law

Object remains at rest or in uniform motion unless acted on by a resultant force.

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Newton's 2nd Law

Acceleration = resultant force ÷ mass (F ∝ a; a ∝ 1/m).

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Newton's 3rd Law

Every action has an equal and opposite reaction.

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Representing forces on a diagram

Arrows: length = magnitude; direction = force direction.