BC: The acting force on the wood "the hand" has the reaction on the wood of breaking it. The acting force on the newton balls is the three balls that are higher than than the still balls. When the first two balls collide with the balls at rest there kinetic energy is transfered to the still balls.
FC: Newton's 3 laws of Motion Joseph Johnston 7B 12/8/09
1: The First Law The state of motion of an object does not change as long as the net force acting on the object is zero.
2: The boxer and the car crash show this law. The boxers hand and the car remain in motion until acted on by an unequal force or equal in the case of the car wreck, and the punching bag.
3: The Second Law The acceleration of an object is equal to the net force acting on it divided by the object's mass.
4: The biker and the hockey players show the second law of motion well. The biker is pedaling down a hill. So the two forces acting on him are his pedaling and gravity making him go faster. The hockey players slamming each other into the wall shows how they're combining net force slows them down.
5: The Third Law Whenever one object exerts a force on a second object , the second object exerts an equal and opposite force on the first object