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because of gravity
Gravity because it is pulling down the box
Yes, in a way. You place a cup on a table and don't expect the cup to move unless you push it or you tip the table so creating a slope down which the cup must move due to gravity and with the lessening friction with the table's surface. Therefore, friction and gravity combine to ensure your cup remains in place. So, a cup on a level table top will not move unless you give it a shove, so exerting an outside force.
not the force of water, but gravity and density does
Air pressure or water pressure makes water move.
For example, if the book is resting on a table, gravity pulls the book down, and the table pushes the book up.
This is because gravity is pulling you down, so you don't have to pedal as much downhill. Uphill, on the other hand, gravity is STILL pulling you down, so you have to fight to move forward AND to move against gravity.
The mass of the object (force of gravity) and the frictional force of moving the table are greater than the horizontal force that the boy is exerting on the table... so it won't move
Gravity and the moon and sun
eventually you get the gravity suit this lets you move through water unhindered
due to attraction of the earths gravity the water will atrracted by it