Mass, weight and gravity

• Mass is the amount of stuff in an object
• Weight is caused by the pull of gravity OR the weight of an object is just the force of gravity pulling it towards the center of earth.
• An object has the same mass whether its on earth or moon -- but its weight will be different.
• 1kg mass will weigh less on the moon (about 1.6N) than it does on earth which is about 10N because the force of gravity pulling on it is less.
• Gravitational field strength is measured as N/Kg
• The formula to calculate weight is W = mg where m is mass and g is gravitational field strength.
• Weight is a force measured in Newtons (N)
• Weight can be measured using a spring balance or a newton meter
• Mass is NOT a force
• Mass is measured in Kilograms.
• on earth the gravitational field strength is 10N/KG but on moon its 1.6N/KG
• Gravitational field strength is the amount of pull from Earth's gravity at any point on it surface
• Gravity is an attractive force between two objects with mass that pulls them towards one another
• Gravitational field strength is measured in N/kg