Because when you push down on the pedals the rear wheel is forced to rotate.
First you have to go relatively slow and then jerk your body up and back and start pedalling fast.
A bicycle trainer is a bicycle frame fixed to an immoveable frame fastened to the floor, or a bicycle that runs on horizontal rollers, on which a person can pedal as an indoor exercise. The pedalling pressure can be adjusted, and the distance pedalled, time taken, heart beat, etc, can be recorded. Racing cyclists often warm up on a bicycle trainer before a race, and then warm down after the race - so as to avoid straining their muscles.
gravityGRAVITY
It has to do with gravitational pull.
yes but if they are going down road
The invention of the multi-speed bicycle increased the usefulness of the vehicle. It made it easier to pedal up hills giving it much more range.
You will need a bicycle, press b to change the speed of the bicycle. now you can cycle over the ramps
Bicycle tires start at a little over 3/4 inch for high speed racing tires, going up through 1.5 inch for light road going tires to 2.25 inch for knobbly off-road tires.
Nothing much really. If you're on a long/steep descent you may eventually end up going so fast that you can't keep the pedals turning fast enough to be able to add any more speed. At this point you will begin to coast, i.e. the wheels will keep spinning regardless of the chain and pedals, which will continue until your speed has tapered off to the point where pedalling will again engage and put power to the rear wheel.
an average bicycle has up to 24 gears but a bicycle has up to 30 gears
As a bicycle rolls downhill, the force of gravity pulls it downward, converting potential energy to kinetic energy, causing it to accelerate. The increase in speed is a result of the gravitational force overcoming the resistance from friction and air resistance.
Look it up on the interweb