Chi tiết vs ạ !! Like all machines, a bicycle makes work easier. With a bicycle, it (1) …………… much less effort to get to where we are going (2) …………… it would if we were walking. We can get many times farther on a bike even though we burn the same (3) …………… of energy. Bicycles make this possible (4) …………… using a combination of simple machines and the laws of physics. Bicycles have a number of simple machines included in (5) …………… wheels, pedals, gears, and brakes that help the bike to move. When the rider balances on a bike, he does so according (6) …………… the laws of physics. Even simpler parts like the frame of a bike take science (7) …………… account. Two of the (8) …………… important parts of any bicycle are the wheels and the gears. On flat ground, gears attached to the wheels increase the distance a rider gets from one turn of the pedals, allowing him (9) …………… cover a lot of ground quickly. On hilly terrain, gears give the rider (10) …………… power when it is needed by lessening the distance the bike travels.