| − | The '''equivalence principle''' is the Newtonian idea that states the force felt by someone standing in a gravitational field is the same as the pseudo-force felt by someone in an accelerating reference frame. | + | The '''equivalence principle''' is the [[Isaac Newton|Newtonian]] idea that states the force felt by someone standing in a gravitational field is the same as the pseudo-force felt by someone in an accelerating reference frame. |
| − | More simply put, it attempts to say that being on Earth and experiencing gravity is equivalent to being in a spaceship accelerating upwards at 9.8 ms<sup>-2</sup> (g). | + | More simply put, it attempts to say that being on Earth and experiencing [[gravity]] is equivalent to being in a spaceship accelerating upwards at 9.8 ms<sup>-2</sup> (g). |