Unless a brake is engaged, the wheels on a car in neutral can rotate backwards. If the car is in gear, wheels attached to the power train probably will only rotate backwards if the car is in reverse gear. If it is in forward gear or "park" they should not rotate backwards. Wheels not connected to the power train should be able to rotate either direction.
The wheels only appear to spin backwards.
ENGINE
it just looks it its not really going backwards, that's what they call an optical illusion.
usually forward but if you shift to "R" then they go backwards
It is an optical illusion.
A car wheel is attached to an axle. If the car is RWD, the rear wheel axle will be connected to the engine and the front wheels not be. In a 4WD or FWD car the front axle, with a ball joint to allow steering, will also be connected to the engine via a torque tube and a geared differential.
While turning, the inside wheels take a shorter path than the outer wheels so they must rotate at different speeds.
The axle prevents them doing so.
The wheels only appear to spin backwards.
-- The steering wheel inside my car -- The hour-hand and minute-hand on the car's clock -- The car's four outside wheels
If you mean like an airplane without wings, there's air resistance, friction between the wheels and the ground, and the axle on which the wheels rotate.
The wheels of a vehicle may rotate in different directions if they have a system that is called "spur-gear differential." Pinion pairs are displaced axially, and mesh part of the length between two spur gears, results in rotation in opposite directions.