Final answer:
Trucks must have safety supports when parked for an extended period. An empty trailer bounces more than a loaded one. The maximum acceleration of a truck on dry concrete depends on the weight distribution and friction.
Step-by-step explanation:
Trucks with dump bodies must be equipped with positive means of support, permanently attached, and capable of being locked in position to ensure stability and safety. This safety feature is mandatory when the truck is parked for an extended period. Such supports are necessary to prevent accidental tipping or instability that could lead to accidents or damage.
If you see a freight truck with its trailer bouncing up and down slowly on the highway, it is more likely that the trailer is nearly empty. A heavily loaded trailer would have less bounce due to the greater mass damping the oscillations of the suspension system.
In the case of a 1.00 × 10³ kg utility truck, if half of its weight is supported by its two drive wheels, the maximum acceleration it can achieve on dry concrete can be calculated using Newton's second law and the coefficient of friction between the tires and concrete. Whether a metal cabinet would slip on the wooden bed during acceleration depends on the frictional force between the cabinet and the bed.