Force of gravity 

When a car goes down hill it moves faster than a car going up hill.

When a car goes up hill it goes a bit slower than going down hill .

When the car goes down hill gravity is pulling it toward the center of the earth.

When a car is going up hill gravity is pulling it back so it goes slower.

It doesn't need much force to go down a hill it moves by itself.

It needs the most force to go up hill.

On flat land it doesn't move very far with a small push.

Gravity is a force that pulls objects towards the center of the earth.

Cars can go faster down hill than up hill because up hill you need lots of force to move it.

The car going up hill needs the most force.

By Jenaea & Oceanna.