Question

which of the following are the correct units for force? choose all that apply. oz dyn n kg kg·m/s lb kg·m/s² tons

Explanation:

• oz (ounce): In the context of force, the ounce - force is a unit of force.
• dyn (dyne): By definition, \(1\space dyn = 1\space g\cdot cm/s^{2}\), and it is a unit of force in the CGS (centimeter - gram - second) system.
• N (newton): From Newton's second law \(F = ma\) (\(m\) in \(kg\), \(a\) in \(m/s^{2}\)), \(1\space N=1\space kg\cdot m/s^{2}\), and it is the SI unit of force.
• lb (pound): The pound - force is a unit of force.
• \(kg\cdot m/s^{2}\): Using \(F = ma\) (\(m\) in \(kg\), \(a\) in \(m/s^{2}\)), this is the derived SI unit of force (which is equivalent to the newton).

• kg (kilogram): This is a unit of mass, not force.
• \(kg\cdot m/s\): This is a unit of momentum (\(p = mv\), \(m\) in \(kg\), \(v\) in \(m/s\)).
• tons: This is a unit of mass (e.g., metric ton \(= 1000\space kg\)), not force.

Answer:

oz, dyn, N, lb, \(kg\cdot m/s^{2}\)