Weight mass, and gravity

• A gravitational force acts between any two objects.
• The bigger the mass of the objects the bigger the force between two objects.
• The greater the distance between the objects the less the force between the objects.
• The weight of an object is the force on it due to gravity.
• Weight w is calculated using the equation w = m x g, where m is mass (in kg) and g is the gravitational field strength (in N/kg).
• The gravitational field strength on Earth is about 10N/kg. This means that all objects on earth fall with an initial acceleration of about 10m/s2.