# Question: Can Science Explain Bicycles?

## Is a bike a simple machine?

A bicycle is a composite of several simple machines.

a.

Describe where these simple machines are found on a bicycle: lever, pulley, and wheel-and-axle..

## Why are cyclists so skinny?

That means that muscle development is fairly common. At the same time, endurance cyclists will burn a lot of fat. All that’s left is muscle. So they’re skinny, but athletic.

## What is a bicycle classified as?

A bicycle, also called a bike or cycle, is a human-powered or motor-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. A bicycle rider is called a cyclist, or bicyclist.

## What forces are used when riding a bike?

The primary external forces on the bike are gravity, ground, friction, rolling resistance, and air resistance.

## Why bicycles do not fall?

The most common explanation is that the wheels on a bike act as a gyroscope, preventing the bike from falling over. … The bike had two front wheels, one on the ground and rotating forward, and one off the ground rotating backward. This way, the total angular momentum was zero. However, the bike remained stable.

## What is a good watts per kg?

Here are the categories that they recommend you race based on your FTP data and watts per kilogram. The Zwift C category (next from the bottom) says that you should be able to ride at the level between 2.5 to 3.1 w/kg. If you want to succeed in the A category, you’ll need to be able to hit 4.0 w/kg or better.

## How does a bicycle work scientifically?

Bicycles turn energy created by our bodies into kinetic energy. … A bicycle can convert up to 90 percent of a person’s energy and movement into kinetic energy. This energy is then used to move the bike. The rider’s balance and momentum help keep the bike stable while traveling along a path.

## Is riding a bike a balanced force?

An object with forces acting on it can be moving at a constant velocity as long as those forces are balanced. For example, if you ride a bike straight ahead at a constant speed, the force moving the bike forward exactly balances the forces of friction that would slow the bike down.

## Are bicycles vehicles?

In fact, bicycles in the roadway are considered vehicles. NHTSA says cyclists 10 years and older should behave as though they were vehicles on the street, riding in the same direction as other traffic that’s going their way and following the same traffic rules. The cyclists, then, are on the same level as motorists.

## Which class of lever is a bicycle handbrake?

In the second-class lever design, the arm pivots below the rim. The brake shoe is mounted above the pivot and is pressed against the rim as the two arms are drawn together.

## Is 200 watts good cycling?

Most pro cyclists produce about 200 to 300 watts on average during a four-hour tour stage. The recreational rider, on the other hand, might be only able to sustain this wattage during a 45-minute or hour-long spin class.

## How can I increase my bike power?

5 Simple Ways to Increase Bike PowerRide in bigger gears. Riding in bigger gears at the same cadence in a particular set of conditions makes for a consistently higher power output. … Ride uphill. … Ride into headwinds. … Use block training. … Follow the 75-percent rule.

## What are three forces acting on a bicycle when you ride it?

There are three forces acting on the rider and bicycle. The weight of the rider and bicycle, W, acts vertically downward from their center of gravity. The normal force, N, of the road acts vertically upward from a point below the center of gravity. And the frictional force, F, of the road acts horizontally to the left.

## Why can we balance on a bicycle?

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. … If you try to tilt the axis of a gyroscope in one direction, it will turn in a different direction.

## Why do bicycles stay upright?

If anyone ventures an answer they most often say that it’s because of the “gyroscopic effect” – but this can’t be true. Put simply, the gyroscopic effect occurs because a spinning wheel wants to stay spinning about its axis, just as a spinning top or even planet Earth stay aligned to their spin axes.