Why is difficult to put a cycle into motion then to maintain its motion?

Answer 1

When you first start the cycle, you do work to add kinetic energy to it, which moves if forward, but you are also adding rotational energy to the wheels. Once you are at the desired speed, you only need to overcome frictional forces from air and friction losses in the gears and bearings of the bicycle. If you stop pedaling, the rotational energy of the wheels can help keep it going, for a little while. If you suspend a wheel, and get it spinning, it can spin for a while without any additional input. It takes energy to stop it (some comes from the friction in the bearings to gradually slow it down, and some from the air).

Answer 2

It is more difficult to put a cycle into motion than to maintain its motion because starting the movement from a standstill requires overcoming inertia, while maintaining motion simply requires overcoming friction and air resistance. Once the cycle is in motion, it will continue to move at a steady speed due to Newton's first law of motion unless external forces act upon it.

Answer 3

When you first start the cycle, you do work to add kinetic energy to it, which moves if forward, but you are also adding rotational energy to the wheels. Once you are at the desired speed, you only need to overcome frictional forces from air and friction losses in the gears and bearings of the bicycle. If you stop pedaling, the rotational energy of the wheels can help keep it going, for a little while. If you suspend a wheel, and get it spinning, it can spin for a while without any additional input. It takes energy to stop it (some comes from the friction in the bearings to gradually slow it down, and some from the air).