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Forces
| Term | Definition |
|---|---|
| Force | a push or pull on an object |
| Net force | combined forces on an object |
| Unbalanced forces | forces acting on an object that aren’t balanced |
| Balanced forces | forces acting on an object that are balanced |
| Newtons | units to measure force |
| Friction | a force where two surfaces exert one another |
| Static friction | friction that acts on objects that aren’t moving |
| Sliding friction | friction when two solid surfaces slide against each other |
| rolling friction | when an object rolls against another object |
| Fluid friction | when a solid object moves through a fluid |
| Gravity | a force that pulls objects towards each other |
| Mass | the amount of matter in an object |
| Weight | the gravity on an object on 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 object flowing through the air |
| Projectile | an object that is thrown |
| Compression | an elastic force that squeezes or pushes |
| Tension | an elastic force that stretches or pulls |
| Inertia | an object’s tendency to resist change in motion |