1. Work – review from gr 11 Units - Joules (J) = Nm = kgm2s-2
𝑊=𝐹𝑑cosθ
Units - Joules (J) = Nm = kgm2s-2
positive and negative work
work done on an object , to an object
work done by conservative force, non conservative force
work is area under F vs d curve

2. Work as a dot product - Extension
there are three ways to multiply vectors
multiplication by a scalar
dot product
cross product
𝑊=𝐹𝑑cosθ
definition of dot product
𝐴⋅𝐵=∣𝐴∣∣𝐵∣cosθ
A dot product is the product of the magnitude of one vector times the magnitude of the component of a second vector in the direction of the first vector. A resultant of a dot product is a scalar.
𝑊= 𝐹 ⋅ 𝑑