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Ch 10
| Question | Answer |
|---|---|
| Force | A push or 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 | cause change in velocity which is a force |
| balanced forces | Equal force acting on one object in opposite directions |
| Friction | The force that one surface exerts on another when the two surfaces rub against each other |
| static friction | A friction that acts on objects that are not moving |
| Sliding friction | occurs when two solid surfaces slide over each other |
| Fluid friction | occurs when a solid objects moves through a fluid |
| gravity | a force that pulls objects towards each other |
| 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 the object is in free fall |
| Air resistance | fluid friction that acts on objects falling through the air |
| projectile | an objects that is thrown |
| compression | an elastic force that squeezes or pushes matter together |
| tension | AN elastic force that stretches or pulls matter |
| Inertia | Galileo's concept of the resistance to a change in motion |
| momentum | another name for momenetum |
| Law of conservation of momentum | in the absence does not change |
| satellite | any object that orbits another object in space |
| centripetal force | any force that causes an object to move in a circular path |
| rolling friction | friction occurs when an object rolls over a surface |