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Forces
vocab words
Term | Definition |
---|---|
force | A push or pull exerted on an object |
Newton | The SI unit used for the magnitude, or strength, of a force |
Net force | The overall force on an object when all the individual forces acting on it are added together |
Unbalanced forces | Forces that cause an object’s velocity to change |
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 a 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 | An elastic force that squeezes or pushes the molecules in matter together |
Tension | An elastic that stretches or pulls on the molecules in matter |
Inertia | The tendency of an object to resist any change in its motion |
Momentum | The product of an object’s mass and velocity |
Law of conservation of momentum | The rule that in the absence of outside forces the total momentum of objects that interact does not change |
Satellite | Any object that orbits another object in space |
Centripetal force | A force that cause an object to move in a circle |