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Scalar
Only magnitude.
Vector
Magnitude and direction.
Examples of scalar quantities
Speed, mass, energy, time.
Examples of vector quantities
Force, velocity, displacement, acceleration.
Equation for weight
W = m g.
Newton's 2nd Law equation
F = m a.
Resultant force
Single force that represents all acting forces combined.
Newton's 1st Law
Object remains at rest or in uniform motion unless acted on by a resultant force.
Newton's 2nd Law
Acceleration = resultant force ÷ mass (F ∝ a; a ∝ 1/m).
Newton's 3rd Law
Every action has an equal and opposite reaction.
Representing forces on a diagram
Arrows: length = magnitude; direction = force direction.