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Forces
Term | Definition |
---|---|
Force | A push or a pull |
Newton | The SI unit for the magnitude or strength of a force |
Net Force | The combination of all forces acting on an object |
Unbalanced Forces | Forces that cause an object’s velocity to change. |
Balanced Forces | Equal forces acting on an object in opposite directions. |
Friction | A force that two surfaces exert on eachother when they rub against each other. |
Static Friction | The friction that acts on objects that are not moving. |
Sliding Friction | Friction that occurs when two solid surfaces slide over each other. |
Rolling Friction | Friction that occurs when an object rolls across a surface. |
Fluid Friction | Friction that occurs when a solid object moves through a fluid. |
Gravity | A force that pulls objects toward each other. |
Mass | The measure of the amount of matter in an object. |
Weight | The gravitational force exerted on a person or object at the surface of a planet. |
Free Fall | When the only force acting on an object is gravity. |
Air Resistance | A type of fluid friction that acts on objects falling through the air. |
Projectile | An object that is thrown. |
Compression | An elastic force that squeezes or pushes matter together. |
Tension | An elastic force that stretches or pulls matter. |
Inertia | The tendency of an object to resist a change in motion. |
Momentum | A characteristic of a moving object that depends both on mass and the velocity of the object. |
Law of Conservation of Momentum | States that in the absence of outside forces, the total momentum of objects that interact don’t change. |
Satellite | Any object that orbits another object in space. |
Centripetal Force | Any force that causes an object to move in a circular path. |