# Gravity

## 5 terms

### Weight is different from mass

Mass-measure of the amount of matter in an object
Weight- gravitational force that an object experiences because of its mass
Earth, where g=9.8 m/s/s
Venus, where g= 8.9 m/s/s
Mars, where g=3.7 m/s/s
Neptune, where g= 11.0 m/s/s

### Weight is measured in newtons

Weight=mass x free-fall acceleration (w=mg)
Weight is a force
SI unit of weight is the Newton (N)
Ex. 2.25Kg x 9.8 m/s/s= 22 N on Earth

### Weight & Mass

Weight- a measure of the gravitational force exerted on an object
Force on an object due to gravity=weight
9.8 m/s/s
F=ma (Force= mass x acceleration)

### Weight influences shape

Gravitational force affects the shape of living things.
large animals have strong skeleton because of their huge mass against the force of gravity.
more mass of an animal, much larger skeleton

### Law of Universal Gravitation

"All objects in the universe attract each other through the force of gravity"
Gravitational force increases as the distance between 2 masses increases.