Question

you need to be more careful when you cycle down a hill than when you cycle up the hill. why?

Answer 1

The reason is the force of gravity
When u cycle up the hill u go against the gravitational force but when u cycle down the hill u are not against the gravitationalforce

Answer 2

Because of the gravity,the speed is faster when going down a hill.We should be careful because we can fall off the cycle even if there is a small stone due to friction.