Final answer:
In physics, using one hand to steer and turn a vehicle like a motorcycle is related to the principles of gyroscopic effects and counter steering, where pulling back on one handlebar causes the vehicle to tip and turn in the opposite direction.
Step-by-step explanation:
The question about steering while turning and moving forward is related to physics, specifically concerning principles of motion and forces. When steering a motorcycle or any other two-wheeled vehicle, using one hand to pull back on one handlebar will indeed cause the vehicle to tip and turn in the opposite direction. This occurs due to the gyroscopic effect and counter steering principles. At high speeds, the wheels of a motorcycle act like gyroscopes, which maintain angular momentum. When the right handlebar is pulled back, the front wheel tilts to the left, initiating a left turn due to the change in direction of the forces acting on the motorcycle.
A similar concept of forces can be applied to understand why a person walking 2 km east and then 1 km north, but taking a wrong turn on the second leg, will end up in a different location than intended, as the magnitude and direction of their total displacement changes.
In terms of a car moving on a straight road at a constant speed in a single direction, it's assumed that there are no forces causing it to turn. However, if the car turns, passengers may feel a force pushing them to the opposite side due to inertia. This is explained by Newton's first law, which states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.