Work – review from gr 11 Units - Joules (J) = Nm = kgm2s-2

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Presentation transcript:

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

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