Newtons Second Laws
The acceleration of an object is determined by the mass of the object and the amount of force applied to the object. The larger the mass of an object the more force it takes to accelerate the object. For example, if you threw a rock that had a mass of 8kg with a force of 24N then it would accelerate at 3m/s.
Newton's Third Law
For every action, there is an equal and opposite reaction. For instance, if you were jumping on a trampoline the force you used to go down would then push you up, therefore making you bounce.