# Frequent question: Why does a bicycle move forward?

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When you pedal forward, the spring pushes the pawl into the face of one of the teeth and it gets stuck there as long as you pedal forward. That forces the blue part to turn in the same direction as the green part and the bike rolls forward.

## What will cause a bike to move forward?

Newton’s third Law informs that for every force there is an equal and opposing reaction force. … As a result, of the reaction fore of the ground, the tires of the bicycle begin to move in the forward direction, therefore allowing the cyclist to accelerate forward.

## Why does bicycle move forward not backwards?

There is no sprocket nor any chain attached to the front wheel. That means there is no mechanism to convert the rotary energy given to the paddles to convert it to the motion of the wheels. Thus we can’t move backwards when we move the paddles in reverse direction.

## Why do bicycles use different forward and backward gears?

Gears are changed on the cassette (a set of sprockets on the rear wheel) by the rear derailleur. This shifts the chain up or down the cassette. … The gears at the front provide large jumps, which effectively change the range of your gears, so that they are more suited to high speed, flat terrain or low-speed climbing.

## What keeps a bike from falling over?

The accepted view: Bicycles are stable because of the gyroscopic effect of the spinning front wheel or because the front wheel “trails” behind the steering axis, or both. … This “trail” gives the force of the ground on the front wheel a lever arm to cause steering in a way that can help restore balance.

## Is it bad to pedal backwards?

The only harm is if you’re between derailleur gears. Then, pedaling backwards can distend or derail the chain, or grind against the derailleur. You should be able to feel or hear if you’re doing this; if you are, stop. On a fixie, pedaling backwards will drive the wheel backwards, or stop the bike if it’s moving.

## Why won’t my pedals go forward?

When the pedal bearings are too rusty and worn out, bike pedals won’t move forward. Besides, incorrect chain alignment or short braking cable can cause a fake pedal stuck.

## Why does a bicycle stay upright?

What we do know about how conventional bikes stay upright on their own is this: when a moving bike starts leaning to one side, it also automatically steers towards that side a little bit. The result is that the wheels come back underneath the center of mass, keeping the bike balanced.

## Why is it harder to pedal in higher gear?

High Gear = Hard = Good for Descending: The “highest” gear on your bike is the largest chain ring in the front and the smallest cog on your cassette (rear gears). In this position, the pedaling will be the hardest and you’ll be able to accelerate while traveling downhill.

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## What gear should I use on a flat road?

For riding on flat roads, it is recommended to use the middle gear. It is a common choice among bikers as it helps you reduce pressure from your feet onto the pedals.

## Why is cycling uphill so hard physics?

Going up a hill steep enough that most of your work is against gravity, for a given power available the time taken increases in proportion to the weight of cyclist and bike. Going down a hill that is steep enough that there is little need to pedal, the time taken decreases as the square root of the weight.