• The object's force does not have momentum. The force that you use increases as you push, but the force of the object becomes constant. Yeah, the other answers are better.. they explain it more scientifically.
  • Key word is Force, not to be confused with movement. Try pushing another person, notice YOU also go backwards a bit. Now try pushing a ball. It moves, you don't: Force = Mass * Acceleration The mass of the ball is much lower, so it is has a much higher acceleration, conversly, you are very heavy, and have next to no acceleration. So you do get pushed back when you push something, but not nearly a noticable amount.
  • You must have more mass or acceleration than the object. Forces balance out. objects do not exert an equal and opposite reaction. For every action, there is an equal and opposite reaction. When you move your arm forward, your body id absorbing the opposite force backwards. when yo throw a football with your arm, your foot is pushing off of the ground and the ground and your body asre absorbing some force.
  • An object at rest tends to stay at rest unless acted upon by an outside force. In this instance you have become the outside force great enough to overcome the friction holding the object at rest.
  • Easily. Either you pass the force on to something else, which is what happens on earth, or you and the object fly apart with equal and opposite momentum, as happens in space. On earth, if you push, say, a chair, there is an equal and opposite force acting upon you. But you then push, through your feet, on the floor, so you pass the force on to the thole earth. If the chair moves when you push it then the earth also moves, by an equal and opposite amount per unit mass. Put since the earth is so many billion times heaver than the chair, for all normal purposes (including those of physicists but not mathematicians or extreme pedants) that it can be regarded as fixed.
  • ' Consider a swimmer pushing off from the side of a pool [...] The swimmer pushes against the pool wall with her feet and accelerates in the direction opposite to that of her push. The wall has exerted an equal and opposite force back on the swimmer. You might think that two equal and opposite forces would cancel, but they do not because they act on different systems. In this case, there are two systems that we could investigate: the swimmer or the wall. If we select the swimmer to be the system of interest, as in the image below, then F_{wall on feet} is an external force on this system and affects its motion. The swimmer moves in the direction of F_{wall on feet}. In contrast, the force F_{feet on wall} acts on the wall and not on our system of interest. Thus F_{feet on wall} does not directly affect the motion of the system and does not cancel F_{wall on feet}.' Source:

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