Final answer:
The best way to recognize a trailer skid is by seeing it in the side mirrors, and a trailer that bounces slowly is likely nearly empty because of less damping effect. The sensation of being flung outwards in a turning car is due to the fictitious centrifugal force resulting from the car's change in direction.
Step-by-step explanation:
The earliest and best way to recognize that the trailer has started to skid is by seeing the trailer in the side mirrors. When it comes to the dynamics of a freight truck with a trailer, if you observe that its trailer is bouncing up and down slowly, it is more likely that the trailer is nearly empty. A heavily loaded trailer would have less bounce due to the weight pressing down on the suspension, reducing the oscillation you might observe. On the other hand, a nearly empty trailer has less mass, resulting in more pronounced and slower bounces, as there is less damping effect from the weight.
In terms of the feeling of acceleration during cornering in a car, this is described by the concept of centrifugal force, which is a fictitious force that arises due to the body's inertia and the change in direction of the vehicle. Uniform circular motion can provide an experience similar to this force, which is more pronounced during sharp turns or at higher speeds.