Question

when calculating work, force is measured in a joules. b newtons. c foot-pounds. d newton meters.

Explanation:

• Joules: Joules ($J$) is the SI unit of work or energy, not force. Work ($W$) is calculated as $W = F\times d$ (force times distance), so joules are for work, not force.
• Newtons: The SI unit of force is the newton ($N$). Force ($F$) can be calculated using Newton's second law $F = ma$ (mass times acceleration), and it is the correct unit for force in the context of work - force - distance calculations.
• Foot - pounds: Foot - pounds is a unit of work or energy in the imperial system, similar to joules in the SI system. It is not a unit of force.
• Newton meters: Newton meters ($N\cdot m$) is equivalent to joules (since $W = F\times d$, with $F$ in newtons and $d$ in meters), so it is a unit of work or energy, not force.

Answer:

B. newtons.