5.2. Work Done

Question 1

Work done by a force

Answer 1

• The product of the force and displacement in the direction of the force
• W = F s

Question 2

Work done by an expanding gas

Answer 2

• The product of the pressure and the change in volume of gas
• W = P ⋅ δV
• Condition for formula: temperature of gas is constant
• The change in distance of the piston, δx, is very small
  therefore it is assumed that P remains constant