click below
click below
Normal Size Small Size show me how
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. |