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a force of attraction between objects that is due to their masses


a force that opposes motion between two surfaces that are touching


the curve described be a projectile, rocket, or the like in its flight


the rate at which an object moves; it depends on the distance traveled and the time taken to travel the distance


the speed of an object in a particular direction


an objects change in position over time when comparied to a reference point

potential energy

the energy of positoin or shape

kinetic energy

the energy of motion; this energy depends on its speed and mass


the rate at which velocity changes; an object accelerates if its speed changes; if its direction changes or if both its speed and direction changes

centripital force

...the force, acting upon a body moving along a curved path, that is directed toward the center of curvature of the path and constrains the body to the path.

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