Jumping...you exert a force on the ground, the ground exerts a force on you which causes you to move upwards.
you can begin walking across the floor because you push on the floor and the floor pushes back on you.
An airplane pushes back on the air and the air pushes forward on the plane.
Jump off a skateboard - it is pushed one way and you are pushed the other way.
Rockets and jets push fuel and other gas out their exhaust nozzles and those exhaust streams push back on the rockets and jets, propelling them forward.
you can begin walking across the floor because you push on the floor and the floor pushes back on you.
An airplane pushes back on the air and the air pushes forward on the plane.
Jump off a skateboard - it is pushed one way and you are pushed the other way.
Rockets and jets push fuel and other gas out their exhaust nozzles and those exhaust streams push back on the rockets and jets, propelling them forward.
