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Force and Newton's (http://www.physicsclassroom.com/Class/newtlaws/U2L…

- - - - balanced forces
        
        a force can act on an object without causing it to accelerate if other force.
- - - - weight and mass
- - - - large and small objects
      - Newton's third law enables a rocket to fly. the rocket pushes the gas molecules downward, ad the gas molecules push the rockets upwards.