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when i press "a" to go left the whole cube slowly start rotating left while moving forward. but when i press "d" to go right it does go right but does not rotate right.
Remember to add a Physic Material to the Ground, and reducing the Dynamic and Static Friction of the Physic Material to 0 each.
@Sammie156 Ya it has been applied to the ground. If I had not then the cube would tumble while moving forward.