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13 Cards in this Set
- Front
- Back
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What is gravity
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A force of attraction between masses
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What is the first effect of gravity (hint: acceleration)
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On planet it makes things accelerate towards ground at about 10 m/s2 (REMEMBER SQUARED)
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What is second effect of gravity
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It gives everything weight
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What is third effect of gravity
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It keeps planets, moons ans satellites in orbit. Balance between forward motion of object and gravity pulling it inwards.
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Are weight and mass the same?
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NOOOOOO!!
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What is mass?
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The amount of stuff in an object. Same anywhere in universe.
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What is weight?
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weight is caused by the pull of gravity. The force of gravity pulling it towards planet
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Is an object's weight different between earth and moon?
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Yes. 1kg mass weights less on moon (1.6N) than earth (10N)
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What are the units of measure for weight?
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Newtons (N)
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How do you measure weight/ force?
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using a spring / Newton meter.
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What is the formula relating Mass, Weight and Gravity?
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weight = mass x grav field strength
w = mg |
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What is grav field strength on Earth and Moon?
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Earth = 10 N/kg
Moon = 1.6 N/kg |
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What is weight of 5kg mass on:
a. Earth b. Moon |
w = mg
a. w = 5 x 10 = 50 N b. w = 5 x 1.6 = 8N |
