| Term | Definition |
|---|
| external world | everything surrounding a system that exerts forces on it is the |
| gravitational force | the attractive force that exists between all objects with mass is the |
| Newton's 1st law | "An objects that is at rest will remain at rest, and an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on the object is zero" This sentance is a statement of |
| force | an action exerted on an object that causes a change in motion is a |
| field force | a force that is exerted without a contant is a |
| interaction pair | two forces that are in opposite directions and have equal magnitudes are an |
| tension | a force exerted by any segment of a rope or string on an adjoining segment is |
| net force | the vector sum of two or more forces acting on an object is the |
| equilibrium | the net force on an object in------ is zero |
| drag force | a force exerted by a fluid on an object moving through the fluid is a |
| Newton's 2nd | "The acceleration of a body is directly proportional to the net force on it and inversely proportional to its mass" This sentence is a statement of |
| apparent weight | the force exerted on a scale by an object and other forces acting upon the object is the |
| contact force | a force that acts on an object by touching it is a |
| Newton's 3rd | "The two forces in an interactive pair act on different objects and are equal in magnitude and opposite in direction" This sentence is a statement of |
| normal force | a perpendicular contact force exerted by a surface on another object is a |
| system | a defined object or group of objects is a |
| inertia | the tendency of an object to resist changes in its motion is |
| agent | the specific, identifiable cause of a force is the |
| free-body diagram | In a ----, a dot represents an object and arrows represent each force acting on it, with their tails on the dot and their points indicating the direction of the force |
| terminal velocity | the constant velocity that a falling object reaches when the drag force equals the force of gravity is its |
| weightlessness | when an object's apparnet weight is zero, the object is in a state of |
| weight | name of gravitational force acting on object |
| 9.8 m/s2 | magnitude of acceleration caused by gravity |
| g | symbol for the acceleration caused by gravity |
| Fg | symbol for the due to gravity force |
| mg | expression for the weight of an object |
| newton | unit of force |
| mass | property of an object that does not vary from location to location |
| weightlessness | having an apparent weight of zero |
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