friction
Bicycles give you more gas mileage.
Cars and bicycles.
bicycles and cars
The arn't made of metal because it is too heavy and slows the car down.
Netherlands
No
To make then easier to be spotted by cars.
Depends on where you're at. In Europe and North America - certainly. Some parts of Asia probably have more bicycles and scooters than cars though.
The force that slows down moving objects is friction, the action of two objects rubbing against each other. This scenario illustrates the action of Newton's Second Law.
Bicycles are a lot more efficient than cars. On a bike 95-98% of the added energy is directly translated into forward motion, while a car would be lucky to reach 40%. While cars are definitely a faster way of transportation compared to bicycles, bicycles would probably be more efficient. Cars are very expensive and you must pay for gas. You also have to account for the distance and if its necessary to have a car for where you need to travel.
buses, cars, bicycles, feet, and what else?