Chalksmashing Ability

First we went over the homework. To give a big book chalk smashing abillity is to pick up the book first. Force is push or pull. Steven is pulling the book upward. The displacement of the book is upward. When the book is risen upward it is given chalksmashing abillity because the displacement and the force are going in the same direction. When the book is just lying on the counter it does not have chalksmashing abillity because there is no chalksmashing ability. For a cart to smash the chalk it has to be pushed toward the chalk to give it the chalk smashing abillity. When the sling shot is pulled back and the dispacment is backwarsds. A pattern is that went the force and the displacement are going in the same direction. But when the force and the displacement are not going in the same direction it does not have chalksmashing abillity. When Josh pushes a cart and Jenna stops it it gives the cart no chalk smashing abillity. Before Jenna touched the cart the displacement was going to the left and when jenna started to push the force went in the other direction it lost it's chalksmashing abillity because the force and the displacement are going in differnt directions, But when the force and displacement are in opposite directions it loses chalk smashing ability. When we do things to the book and the cart we are transfuring energey to the object by applying force and causing displacement. The reason why we can't pick each other up is That we cant transfer energy to ourselves.
-Anthony M.