# Question #9ee04

Jun 22, 2016

The SI system is not based on the foot for length and the pound for mass and force. Those are US units instead.

#### Explanation:

Correctly:

Length --> meter
Mass --> kilogram
Force --> newton

Note that a newton of force is not the same as a "kilogram" force. The latter is the force Earth'a gravity exerts on a kilogram of mass with an acceleration of $9.81 {\text{ m/s}}^{2}$. A newton is a kilogram of mass times $1 {\text{ m/s}}^{2}$.