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If you are driving a loaded tractor trailer, you would downshift to gain more power when going up hill and downshift to control speed when going down hill.
gravity is the one to blame . gravity pulls down the biker closer to earth so it goes faster going down and slower going down
a skier going up a hill a skier going down a hill
If a line has a negative slope it is going 'down hill' and if it has a positive slope it is going 'up hill'
King of the Hill is a TV show not a movie and it's not made by Disney.
because of pressure
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Pressure certainly does increase in a water line going down hill. This is because the weight of the water pulls it.
Up hill. It builds energy, and strenth. Going down hill doesnt do much
It starts to creak when going down a hill or when you are doing a stunt
gravityGRAVITY
Friction and a good grip.