Its called gravitational force. Like earth is one object and a person is another object. The force of interaction between them is called gravitational force & its equal to the weight of that person.
The writer is expressing that people are already happy, but are always looking for more "happines", whether it be new challenges, new experiences, journeys, stuff they learn, things they want to buy but don't really need. People are always looking for new ways to feel like they have achieved something, or always looking for the approval of society.
The correct answer is Punishment
In the Skinner's interpretation, when punishing, the reduction observed in the response does not represent a true reduction in executing such a response, but in a strengthening of competitive responses. What would be the competitive responses? They would be the escape or the avoidance! Thus, when we punish behavior we are simply eluding or avoiding and not teaching better adapted behavior.
Answer:
Two objects with different masses collide and bounce back after an elastic collision.
It does not contain the Literacy clause.