Newton's 3 Laws of Motion
Newton's first law of motion states that an object in motion tends to stay in motion unless an unbalanced force blocks it, while an object at rest tends to stay at rest, unless a force moves it. Basically, this means that a force is needed to change an object's motion or to make it move.
The picture shows that they coffee cup won't move unless a force moves it. Something that can be done in front of the class is someone running non stop.
The second law of motion states that Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). Basically, the amount of force is higher when the mass is higher.
This pic is an example because the pins have little mass so it doesn't take the ball much force to knock down the pins. An example is a kid trying to knock down two kids with different masses.
The third law of motion states that For every action there is an equal and opposite re-action. This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
The person with more mass will fall back more. An example is a person bumping into the wall.