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When you are at the peak of a roller coaster ride and are completely stopped, forces are balanced and the gravity pulls you down and you slide down the roller coaster.
https://videos.usatoday.net/Brightcove2/29906170001/2014/07/29906170001_3696811805001_2-travel-briefs-Kingda-Ka-21.jpg?pubId=29906170001

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When you walk your foot goes forward(action), hits the ground and propels you forward(reaction).
http://i.ndtvimg.com/i/2017-02/walking_620x350_51487764864.jpg

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When you take a swimming stroke your arm goes in and arch motion(action) and hits the water and you propel forward(reaction).
http://www.enjoy-swimming.com/wp-content/uploads/freestyle-stroke-1.jpg

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When a rocket is still and forces are balanced the rocket fuel lights and the rocket accelerates into the sky at a high velocity.
http://www.beckersbakeryanddeli.com/images/Cakes/Rocket%20Launch.jpg

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When you hit a ping pong ball and it is going at a constant velocity and you hit it you are putting a unbalanced force to the ball and the ball accelerates in the direction away from you.
https://www.sciencedaily.com/images/2012/08/120808104454_1_900x600.jpg

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When a car driver pushes down on the gas pedal the car wheels spin faster making forces unbalanced and the car has a higher velocity.
http://images.morris.com/images/athens/mdControlled/cms/2009/05/12/438788614.jpg

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Unbalanced forces when two forces acting on an object are not equal in size. Unbalanced forces causes can cause a still object to move, a moving object to speed up or slow down, a moving object to stop, a moving object to change direction.

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Two forces acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving at the same velocity. Balanced Forces cause no change in velocity.

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Every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

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The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Acceleration is the rate of change of velocity.

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An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Inertia is a tendency to do nothing or to remain unchanged.