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12 Cards in this Set
- Front
- Back
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What is Gravity? |
Gravity is the force of attraction between all masses - but you only notice it when the masses is really really big e.g. a planet |
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What is 1 effect of gravity? |
1. on the surface of a planet, it makes all things accelerate towards the ground (all with the same acceleration - 10m/s² |
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2. What is another effect of gravity? |
2. It gives everything a weight |
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3. What is another effect of gravity and what is an orbit? |
3. It keeps planers, moons and satellites in their orbits An orbit is a balance between the forward motion of the object and the force of gravity pulling it inwards |
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What is mass? |
Mass is the amount of 'stuff' in an object This object will have the same mass anywhere in the universe |
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What is weight? |
Weight is caused by the pull of gravity. The weight of an object is just the force of gravity pulling it towards the centre of the Earth |
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Does mass or weight change if you're on the moon as apposed to Earth? |
The mass stays the same Weight will be less because the force of gravity is less on the moon |
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What is weight measured in and how? |
Kg, a mass balance |
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What is mass measured in and how? |
Newtons, spring balance or newton metre |
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What is the formula linking mass, weight and gravity? |
Weight = mass x gravitational field strength W = m x g |
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What is the 'g' - gravitational field strength on Earth and the Moon? |
Earth - 10 N/kg Moon - 1.6 N/kg |
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Example question using the formula Question - what is the weight, in newtons, of a 5kg mass, both on a) Earth b) The Moon? |
w = m x g a) w = 5 x 10 w = 50N b) w = 5 x 1.6 w = 8N |
