Basically the less weight you have the faster you go
It is important because it has less exhaust and it prevents less pollution.
Because its easier to ride on and it would take less strength to pedal. If they were doing tricks obviously they would use a light bike.
Racing cars use composites in order for strength and to save weight.
As the weight of a vehicle drops the mpg improves.
Heavy cars are not economical. Lightweight cars use less fuel to get them moving and keep them moving.
Most components of modern Formula One cars are made of carbon fiber. Carbon fiber is strong and ultra-lightweight.
Because it is cheap and lightweight.
So that the cars not make enviroment worse
Aluminum
Lotus cars are very good and are recognized most because of their lightweight design and easy maneuverability and downforce.
Many people drive hybrid cars, but they do have some disadvantages. The high price is one of the biggest hybrid car problems. In addition, the complicated system has to be repaired by experienced mechanics, which can be very costly. Generally, hybrids are smaller than most cars and made with lightweight materials. The lighter weight helps increase speed, but it can make hybrid cars more susceptible to being damaged in an accident.
Well..old cars they were made out of metal
I only know about in cars. For cars it replaced metal.
you do not use materials while inventing. you use materials while buiding
Both Aluminium and Titanium are lightweight and incredibly strong. So it is the best choice for being used in cars.