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Forces Vocabulary
| Term | Definition |
|---|---|
| force | a push or pull exerted by one object on another, possibility causing a change in motion |
| contact force | a force that is exerted only when objects are touching |
| noncontact force | a force exerted when objects are not touching |
| net force | the combination of all forces acting on an object |
| balanced forces | forces that act together on an object without changing its motion |
| unbalanced forces | forces that act together on an object and cause its motion to change |
| gravity | the force of attraction among all objects |
| Law of Universal Gravitation | developed by Isaac Newton; states that all objects are attracted to each other by a gravitational force that depends on the mass of each object and distance between them. |
| friction | a force that opposes the motion of an object in contact with a surface |
| static friciton | friction that keeps objects from moving |
| sliding friction | force that opposes the sliding of an object of a surface |
| rolling friction | force that opposes the motion of a wheel turning along a surface |
| fluid friction | friction between a surface and any material, such as water or air, that flows |
| air resistance | fluid friction between a surface and the air |
| elastic force | force exerted by a material when it is stretched or compressed |
| tension force | pulling force applied to an object that can make the object stretch |
| compression force | a squeezing force applied to an object that can make an object shrink |
| normal force | force exerted by an object that is perpendicular to the surface of the object |
| Newton's First Law | Law that states an object at rest tends to stay at rest, and an object in motion tends to stay in motion, unless acted upon by an unbalanced force. |
| Newton's Second Law | Law that states that acceleration depends on the object's mass and the amount of net force applied to it. |
| Newton's Third Law | Law that states when one object exerts a force on a second object, the second object exerts an equal force in the opposite direct on the first object. |
| momentum | combination of the mass and speed of an object |
| conservation of momentum | the principle of total momentum not changing when objects collide |
| action force | the push of the first object on a second |
| reaction force | the push of the second object back on the first object |
| weightlessness | state of being without detectable weight |
| inertia | the tendency of a moving object to keep moving in a straight line |
Created by:
lwaguespack1
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