Determine whether the description of Newton's first or third laws applies in the given cases.
A car drives uniformly on a level road. It is acted upon by the force of the engine and, conversely, by the same force of air resistance.
The force of water resistance inhibits the navigation of the ship, and the ship acts with force on the water to cause waves. Both forces are equal and opposite.
Push a trolley on a flat surface with the force of your hands so that it moves uniformly.
A locomotive acts with force F on the train carriages and accelerates them. The wagons operate with the same opposite force on the locomotive.
A body hangs on a string. The sum of the force on the string and the weight of the body is zero, so the body is at rest.
A body hangs on a string. With its weight it acts on the string vertically downwards, and the string with the equal and opposite force on the body.
