The weight of an object is the force on it caused by the gravity due to the planet. The weight of an object and the gravitational field strength are directly proportional. For a given mass, the greater the gravitational field strength of the planet, the greater its weight.
Weight can be calculated using the equation:
weight = mass × gravitational field strength
This is when:
|Space object||g, gravitational field strength (N/kg)|
|The Sun (star)||293.0|
|Ceres (dwarf planet)||0.27|
|Pluto (dwarf planet)||0.49|
An apple has a mass of 100 g. Calculate its weight on Mars (g = 3.7 N/kg).
100 g = 100 ÷ 1000 = 0.1 kg
Calculate the weight of a 30 kg dog on the Moon (g = 1.7 N/kg).