Friction - several different kinds - and inertia. If riding uphill, also gravity.
When riding a bike, the chemical energy stored in your body from food is converted into kinetic energy as you pedal the bike and move forward. This kinetic energy is then used to overcome frictional forces and propel the bike forward.
depends on the speeds and weights of the involved vehicles.
When riding a bike, inertia helps to keep the bike moving forward and stabilize it as you pedal. Inertia is the tendency of an object in motion to stay in motion, so when you pedal, your body and the bike have inertia that keeps you moving forward. Turning or stopping the bike requires the application of additional forces to overcome this inertia.
Riding a bike experiences rolling friction because the tires are in contact with the ground and the force needed to overcome the resistance of the surface and keep the wheels rolling creates this friction. The deformation of the tire as it grips the ground and the energy loss due to internal friction within the tire also contribute to rolling friction.
Because unless you have a hill to coast down, or a really strong tailwind, you need to pedal to provide a force that can push the bike forward.
Coasting on a bike is when you stop pedaling and let the bike roll freely without applying any force. This can affect the overall riding experience by allowing the rider to rest their legs, enjoy the momentum of the bike, and potentially increase speed without exerting additional effort.
No, I have never seen a bear riding a bike.
When you ride a bicycle, the force of the wheel against the earth causes the earth to push back on the wheel, propelling the bike forward, according to Newton's law of equal and opposite reactions. If the force exerted by the earth is strong enough, it can overcome the inertia of the bike.
is a bike mechanical
In German, you say "Fahrrad fahren" to mean riding a bike.
riding a bike can have an advantage over a plane because if you don't want to pay money than a bike is better and that riding a bike gives you cardio.
It is not safe or recommended to carry a bike while riding another bike. It is best to secure the bike properly on a bike rack or carry it separately when transporting it.