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| Pregunta | Respuesta |
| Gravity attracts all masses, however it is only noticeable with very large objects, such as planets. | Anything near a planet is attracted to it very strongly thanks to gravity. |
| On the surface of a planet, Gravity makes all things accelerate towards the ground (all at the same rate, 10 m/s squared on Earth.) And gives everything a weight. | It also helps to keep satellites in orbit. Orbit is a balance between the forward motion of the object and the force of gravity pulling it inward. |
| Mass is the amount of matter in a object. An object will have the same mass anywhere in the universe. | Weight is the force of gravity pulling it towards the centre of the Earth. This differs depending on the strength of the gravitational pull of different planets. |
| Weight is measured in Newtons (N) which is measured using a newton meter. | Mass is not a force and is measured in kilograms (kg). It is measured using a mass balance. |
| The equation for working out weight is: Weight = mass X Gravity Or W = m x g | the value of g is always 10 on Earth, however it differs on different planets: it is only 1.6 on the moon. |
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