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Forces and Motion
Physical Science: Forces and Motion
Term | Definition |
---|---|
Force | a push or pull exerted on an object |
Newton | a unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second |
Net force | the overall force on an object when all the individual forces acting on it are added together |
Unbalanced forces | force that produces a nonzero net force, which changes an object’s motion |
Balanced forces | equal forces acting on an object in opposite directions |
Friction | The force that one surface exerts on another when the two surfaces rub against each other |
Static friction | Friction that acts on abjects that are not moving |
Sliding friction | friction that occurs when one solid surfaces slides over another |
Rolling friction | friction that occurs when an object rolls over a surface |
Fluid friction | friction that occurs as an object moves through a fluid |
Gravity | the force that pulls objects toward each other |
Mass | a measure of how much matter is in an object |
Weight | a measure of the force of gravity on an object |
Free fall | the motion of a falling object when the only force acting on it is gravity |
Air resistance | the fluid friction experienced by objects falling through the air |
Projectile | an object that is thrown |
Compression | the part of a longitudinal wave where the particles of the medium are close together |
Tension | stress that stretches rock so it becomes thinner in the middle |