A 52 kg student stands on the ground. The Earth's mass is 6.0 × 10²⁴ kg and its radius 6.4 × 10⁶ m.

The law of gravitation: $F = \dfrac{Gm_1m_2}{r^2}$, with $G = 6.67 \times 10^{-11}\ \text{N m}^2/\text{kg}^2$ and $r$ the distance between the centres. The Earth: $M = 6.0 \times 10^{24}\ \text{kg}$, $R = 6.4 \times 10^{6}\ \text{m}$.

Mass ($\text{kg}$) is how much matter, the same everywhere. Weight ($\text{N}$) is the pull of gravity: $W = mg$. On the Moon $g = 1.6\ \text{m/s}^2$ (more exactly $1.62\ \text{m/s}^2$); on Jupiter $24.8\ \text{m/s}^2$.