| A | B |
|---|
| force | a push or pull |
| net force | overall force after all forces are counted |
| unbalanced force | can cause an object to change motion |
| balanced force | will not change the objects motion |
| inertia | the tendency of an object to resist change in its motion |
| sliding friction | created by solid surfaces rubbing against one another |
| rolling friction | when an object rolls over a surface |
| fluid friction | when a object moves through a fluid |
| gravity | the force that pulls objects toward each other |
| free fall | when the only force acting on a falling object is gravity |
| projectile | an object that is thrown |
| air resistance | a type of fluid friction |
| terminal velocity | the fastest speed at which an object can fall |
| weight | the measure of the force of gravity on an object |
| momentum | the product of mass time velocity |
| pressure | equals force divided by area |
| pascal | the unit of pressure |
| fluid | a substance that can flow easily |
| equilibrium | forces equally balanced |
| Bernoulli's Principle | moving fluid has less pressure than still fluid |
