Science exam-force and motion
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Created by:
ahenderson123 on December 5, 2008
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31 terms
Terms | Definitions |
|---|---|
 force | a push or pull that acts on an object |
| newton | a unit named after Sir Isaac Newton that measures force. N=kgm/s^2 |
| friction | a force that opposes tha motion of ovjects that touch as they move past each other. |
| static friction | the friction force that acts on non-moving objects and always acts in the opposite direction of the applied force |
| sliding friction | a friction force that opposes the direction of an object as it slides over a surface. |
| rolling friction | a friction force that acts on rolling objects |
| fluid friction | a friction force that opposes the motion of an object through a fluid |
| air resistance | fluid friction acting on an object through air |
| gravity | a force that acts between any two masses. It causes objects to accelerate downward. |
| projectile motion | the motionof a falling object after it is given an initial forward velocity |
| inertia | the tendency of an object to resist a change in its motion |
| mass | a measure of the amount of matter in an object |
| weight | the force of gravity acting on an object |
| momentum | the product of an objects mass and velocity |
| conservation of momentum | means that momentum does not increase or decrease |
| constant speed | when the speed of an object doesnt change |
| average speed | the total distance traveled divided by the time it takes to travel that distance |
| instantaneous speed | the rate at which an object is moving at a given moment in time |
| average acceleration | the average rate at which velocity increases |
| balanced force | occurs when the net force of an object is zero and there is is no change in the object's motion |
| unbalanced force | occurs when the forces on an object cause the object to accelerate. |
| net force | the overall force acting on an object after all the forces are combined |
| distance | the length of the path between two points. |
| displacement | the direction from the starting point and the length of a straight line from the starting point to the ending point. |
| law of gravitation | states that every object in the universe attracts to every other object. |
| parallax | the apparent displacement of an object as seen from two different points that are not on a line with the object |
| newton's first law of motion | states that the state of motion of an object does not change as long as the net force action on the object is zero. |
| newton's second law of motion | states that the acceleration of an object is equal to the net force acting on it divided by the object's mass |
| newton's third law of motion | states that whenever on object exerts a force on a second object, the second object exerts an equal and opposite force on the first object. |
| scalars | quantities that express magnitude only, such as speed and distance |
| vectors | quantities that express magnitude and direction |
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