# science- gravity and mass vs. weight

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• Weight- a measure of the force of gravity on an object. The weight of an object is the gravitational force between the object and the Earth. The more mass the object has the greater its weight will be.Weight is a force, so it is measured in newtons. On the surface of the Earth an object with a mass of 1 kg has a weight of about 10 N.﻿
• ﻿Mass- a measure of how much matter an object contains. The more matter an object contains, the greater the mass
• Gravity- the attraction between two objects that have mass. Even us, as humans, attract other objects, although our mass is too small for that force to be very strong. Gravitational forces increase when masses are bigger and the objects are closer.
• ﻿The mass of an object stays the same wherever it is, but it’s weight can change. The moon has less mass than the earth, so it’s gravity is less than the earth’s gravity. This means that objects weigh less on the moon than on the earth.
• The Moon has less mass than the Earth, so the moon's gravity is less than the Earth's. This means that objects weigh less on the Moon than they do on the Earth. The moons gravity it roughly around one sixth of the earth's. A 120kg astronaut weighing 1200 N on earth would only weigh 200 N on the moon. The mass remains the same.
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• Mass- 120kg Weight- 1200 N﻿
• Mass- 120kg Weight- 200 N﻿
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