As Newton's First law states,a body at rest will remain at rest and a body in motion will stay in motion unless acted by an external force.
As Newton's Second law states,the force acting on an object is equal to the mass of that object times acceleration(F=MxA)
So easy...
Too....Hard...*breathes heavily*
As Newton's Third Law states,each action there will be an equal and opposite reaction which is how a rocket flys.The air(action) pushes against the ground which causes the rocket to fly(reaction).