| A | B |
|---|
| acceleration | occurs when an object speeds up, slows down, or turns |
| average speed | total distance traveled divided by total time taken |
| balanced forces | two or more forces whose effects cancel each other out and do not change the motion of the object |
| center of mass | point in an object that moves as if allof the object's mass were concentrted at that point |
| force | a push or a pull |
| friction | sorce that acts to oppose sliding between two surfaces that are touching |
| inertia | tendency of an object to resist a change in its motion |
| instantaneous speed | the speed of an object at one instant of time |
| kilogram | SI unit for mass |
| law of conservation of momentum | total momentum of objects that collide with each other is the same before and after collision |
| mass | amount of matter in an object |
| meter | SI unit for length |
| momentum | a measure of how difficult it is to stop a moving object |
| net force | combination of all forces acting on an object |
| Newton's 1st Law of Motion | Net force = 0, object will remain at rest or move in straight line with a constant speed |
| Newton's 2nd Law of Motion | Object acted upon by a net force will accelerate in direction of force |
| Newton's 3rd Law of Motion | Forces will always act in euqal but opposite pairs |
| speed | equals the distance travled by the time it takes to travel that distance |
| unbalanced forces | two or more forces action on an object that do not cancel, and cause the object to accelerate |
| velocity | speed and direction of a moving object |
| weight | a measurement of force that depends on gravity, measured in newtons |
