1st Law of Motion
Objects at rest stay at rest, objects in motion stay in motion unless an external force like gravity or friction acts on it.
The balls remain at rest until another force hits it and makes all of them move.
The girl jumps up and gravity (an external force) pulls her down
The two people push together and are equally balanced until one person pushes with a harder force.
The first law, which is the law of motion relates to my life in many different ways. The first example is when I ride a bike and I hit something such as a rock and then the external force stops my bike from going any further. I can also relate to this law by running around the track and hitting the brick wall, the wall is an external force that will stop me from moving. If I am driving down the road and I slam on my breaks the seatbelt stops my body from going out of the windshield which is another example of the first law. If I am pushing the couch and there is another chair in front of it, the larger couch will push the smaller chair in front of it.