Going up long, steep grades.
friction
Bicycles give you more gas mileage.
bicycles and cars
Cars and bicycles.
The arn't made of metal because it is too heavy and slows the car down.
Bicycles should ride with traffic, following the same direction as cars on the road.
Netherlands
To make then easier to be spotted by cars.
No
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.
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.
Air Resistance slows the parachute down.