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Forces
Term | Definition |
---|---|
Force | a push or pull |
Newton | the SI unit of force |
Net Forces | combined forces |
Unbalanced Forces | forces that produce a nonzero net force |
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 objects that are not moving |
Sliding Friction | Friction that occurs when one solid surface 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 that it become thinner in the middle |