Which pair of quantities are both scalars?
- A. Force and acceleration
- B. Velocity and momentum
- C. Work and power
- D. Torque and displacement
Explanation
Work and power have magnitude only, with work being a dot product and power its rate of change with time. Force, acceleration, velocity, momentum, torque and displacement are all vectors. The habit worth building is to ask whether reversing the direction changes the physical meaning, since for work it does not.