Motion is when the distance between two objects change. For example. if a car is moving right at 40 m/h, and someone else is biking on the sidewalk in the same direction at 3 m/h, then the car is moving away at 37 m/h.
Unbalanced forces cause motion. For example, if someone is pushing a desk to the right at 10N, and someone else is pushing back on the opposite side at 8N, The desk will move to the right at 2N.
Reference point is a place or object is used for comparison to determine if something is in motion. Not all reference points need to be standing still, for example. if you're looking out the car window when it's moving, and you notice you're moving faster then the car next to you.
Motion is when the distance between two objects change
Newton's First Law
An object in motion stays in motion and an object at rest stays at rest unless acted upon by an unbalanced force. For example, if I kick a soccer ball at full force, it won't stop until the net (unbalanced force), comes into contact with it.
Unbalanced forces cause motion
Newton's Second Law
Reference Point is when a place or object is used for comparison to determine if something is in motion
Newton's Third Law
For every action there is an equal and opposite reaction. For example, if you jump off a small rowing boat into water, you will push yourself forwards towards the water.
Object in motion stays in motion, object in rest stays in rest -- unless acted upon by an unbalanced force
F = ma Force = Mass * Acceleration
Force equals mass times acceleration. For example, if you use the same force to push a car and a truck, the car will go faster because it has less mass.
For every action there is an equal and opposite reaction