Because you have to overcome gravity on your way up.
Walking up a hill requires your muscles to work against gravity, leading to more effort and energy expenditure compared to walking on level ground. The incline of the hill increases the vertical lifting component of walking, which adds additional resistance and makes it more difficult to move forward.
gravityGRAVITY
A 4-seat bicycle can accommodate up to 4 people at once.
it has to work harder
Friction which causes heat.
it depends on how fast you ride or if your gowing up a hill
Going up a hill would make your acceleration decrease or cause it to be slow. Going down a hill would make acceleration increase causing you to go faster.
When the rider is at the top of the hill, her potential energy is the greatest, and her kinetic energy is the least.
yes you can :)
So they can have momentum for the rest of the ride. If there was no big hill, then you would constantly have to be pulled by the chains, and that's no fun. But if there is a big hill at the start of the ride, then you go down, down, down, and have enough of that speed/momentum that will keep you gliding along.
its a something that goes form underground to up & you can ride on it! DUH! STUPIDPEOPLE THESES DAYS!.
gravity limits us because its hard to ride a bike up hill