The force would be coming from the right causing the box the lean/ slide to left, if it wasnt sticky.
Answer:
It's like the Earth pulling on you and keeping you on the ground. That pull is gravity at work. Every object in the universe that has mass exerts a gravitational pull, or force, on every other mass. The size of the pull depends on the masses of the objects.
Explanation:
The last one with the guy in the light yellow shirt