Final answer:
Natural forces that act on a vehicle include gravity, inertia, momentum, kinetic energy, potential energy, friction, and centrifugal force.
Step-by-step explanation:
When it comes to natural forces that act on a vehicle, there are several factors at play. Gravity is always present and pulls the vehicle downward. Inertia is the tendency of the vehicle to remain at rest or continue moving in a straight line with constant speed. Momentum is the product of an object's mass and its velocity, and it determines how difficult it is to stop the vehicle. Kinetic energy is the energy of motion possessed by the vehicle. Potential energy is the energy that is stored in the vehicle due to its position or height above the ground. Friction acts on the vehicle to oppose its motion, while centrifugal force is the apparent force that tends to pull the vehicle outward when it is moving in a curved path.