Quote:
Originally Posted by Cd
what would happen to the truck ?
I'm guessing nothing at all.
The vehicle would not coast farther, since the object being moved forward in the bed of the truck is part of the truck itself.
What law of motion is this ?
|
Correct. Every action has an equal and opposite reaction (Newton's 3rd law of motion). When the weight is pushed forward, it proportionally pushes the rest of the truck back.
The only way to push the weight forward without equally robbing momentum from the truck is to push it externally, or for it to have it's own propulsion like a rocket.
By the way, the momentum is conserved because it's all part of the truck. The speed of the truck will change as the weight moves, but return to original speed once it comes to rest.