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Forces and Motion
6th Grade Science
| Term | Definition |
|---|---|
| distance | the length between two places. |
| position | the location of an object compared with things around. |
| motion | a change in an object's potions compared to fixed objects around it. |
| speed | how fast an object's position changes with time at any given moment. |
| velocity | a description of a moving object's speed and direction. |
| acceleration | a change in the velocity of an object. |
| force | a push or pull exerted by one object on another, possibly causing a change in motion. |
| contact force | a force that is exerted only when objects are touching. |
| non contact force | a force exerted only when objects are 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. |
| unblanced forces | forces that do not cancel each other out and that cause an object to change its motion |
| gravity | the force of attraction among all objects |
| friction | a force that opposes the motion of an object in contact with a surface. |
| air resistance | the force that opposes the motion of an object through a gas. |
| elastic force | a force exerted by a material when it is stretched or compressed. |
| tension force | a pulling force applied to an object that can make an object stretch. |
| Newton's first law of motion | a physical law stating that an object at rest tends to stay at rest and an object moving in a straight line at a constant speed tend to continue moving that way. |
| Newton's second law of motion | a physical law that states that an object's acceleration depends on the object's mass and the amount of net force applied. |
| Newton's third law of motion | a physical law that states that for every action there is an equal and opposite reaction. |
| action force | the initial push or pull of one object on another object. |
| reaction force | the push or pull of a second object bac on the object that started the push or pull. |