Newtons 2nd Law of Motion
Newtons 2nd law
Acceleration is equal to force divided by mass.
The greater the mass of the object , the greater the force needed to accelerate.
The bag has a small mass requiring less force, when more is added more force is needed.
He is not using enough force to accelerate the mass of the wall.
Ways Newton's 2nd is Used in Your Life
Playing a game of tug-of-war. Throwing a baseball and throwing a medicine ball with the same force. Pulling a wagon full of stuff. Its easier to push an empty shopping cart than a full one. Pushing a car and a truck with the same force the car will move faster.