Hypothetically, consider a scenario in which a man was exerting X amount of Newtons on a truck that is sitting in neutral on a hill, causing it to remain almost at rest. However, in seconds, the truck begins to slide down the hill. In this example, did the truck exert more, less, or equal to the X amount of newtons exerted by the man?
I thought that although the man's applied force on the truck of X newtons causes the truck to return X newtons, ultimately, the truck's applied force on the man due to gravity must be greater than his X force in net, as the truck is accelerating downwards. Am I right in this reasoning?