My Smore Flyer

Gravity

My personal meaning for gravity is when something standing somewhere or on something gravity is pulling them towards the center of the earth so they do not float off into space.An example is when I am standing on earth and I am not floating off into space then I would know that gravity puching on me towars the earth and I would stay standing on the earth.An example of change in gravity is when i am standing on earth and then i start floating into space that is a change in gravity because it went from keeping me on earth to floating into space.This person in space is just floating in the air because there is no gravity or gravitational force.Here on earth we wouldnt float like this guy,we would stay on the groun because there is gravity and a gravitational force.
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Momentum

My personal meaning for momentum is when an object is rolling or moving on something and it keeps on speeding up and it keeps on getting faster and faster and faster.An example is when a soccer ball is rolling on a smooth surface and I hit it with a bat then it will roll and kepp on getting faster until it slows down or stops by a wall or something.This is and example of momentum because the bowler bowls the ball and the ball keeps on increasing speed as it rolls down the bowling floor. 
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Weightlessness

My personal meaing for weightlessness is when someone is somewhere and in in a moment they feel like they dont weigh like anything.Its like when someone in space is floating around and they feel weightlessness.In space when you are floating around you feel weightlessness because there is no gravitational force or gravity.On earth we dont feel weightlessness because earth has a gravitational forve and earth also has gravity.This guy is feeling weightlessness because there is no gravity or gravitational force.
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Action-Reaction Forces

My personal meaning for action and reaction forces is when something does something it makes that thing do that and then bounce back or something.An example is when I bounce a basketball up against the wall and it bounces back at me.The action force is when I throw the ball at the wall and the reaction force is when the ball bounces back at me.In this picture the action force is when it is being thrown to the ground,the reaction force is it bouncing off the ground and coming back off the ground.If the ball wasnt thrown to the ground there wouldnt be an action force and without an action force there cant be a reaction force.
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