##### dynamics i: force

# Weight is the force of gravity

discussion | summary | practice | problems |

## Discussion

An interaction between bodies due to their mass. Weight is the force of gravity acting on an object.

Derive formula from free fall thought experiment.

**W** = *m***g**

Things that weigh a newton. One newton is about halfway between one-fifth and one-fourth of a pound or the weight of one hundred grams.

1 N ≈ | 101.972 gf | or | 0.101972 kgf |

1 N ≈ | 0.224809 lb | or | 3.59694 oz |

The “acceleration due to gravity” is also equal to the “gravitational field”. Equivalence of inertial and gravitational mass.

Weight is the effect on objects of the acceleration of a reference frame?