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23 Cards in this Set
- Front
- Back
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Gravity is an attraction between .....
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masses
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The bigger the masses, the bigger the ___ between them.
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gravitational force
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The bigger the separation between two masses, the ____ the gravitational attraction between them.
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weaker
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What makes the earth, other planets, and stars round?
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Gravity pulling inward on them in all directions.
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How would your weight change if you were five times farther from the center of the earth than you are now?
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1/25th
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How would your weight change if you were 10 times farther from the center of the earth than you are now?
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1/100th
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If the moon is attracted to the earth, then why doesn't it hit the earth.
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As it falls, it is moving so fast forward in its circular orbit that never gets any closer to the earth.
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What was it that Newton discovered about the force that pulls apples to the ground and the force that hold the moon in orbits?
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They are one in the same.
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Why did Newton think that a force must act on the moon?
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Because it doesn't follow a straight line path. In a circular motion, there is an acceleration and hence a force on an object.
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Newton didn't just discover that the earth has gravity that attracts objects, but....
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that gravity exists between all masses.
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What does the very small value of the gravitational constant G tell us abou the strength of gravitational force?
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Gravitational force is a relatively weak force
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What is the SI unit for weight? |
newton |
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_____ is the measure of the force of gravity pulling on an object. |
the weight of an object is the measure of the force of gravity on that object. |
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Gravity has traditionally been defined as a force of attraction between things that have _____ |
Gravity has traditionally been defined as a force of attraction between things that have mass. |
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The strength of gravity between two objects depends on their |
mass |
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Factors that influence the strength of gravity between two objects are their ....and their distance apart. |
mass |
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Weight is measured with a |
scale |
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The measure of FORCES on gravity |
weight |
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The amount of matter in an object is called |
mass |
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What is Newton's law of universal gravitation? |
F= mgForce = mass x gravity |
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What is Newton's 3rd law? |
To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions. |
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Gravity is an attraction between ..... |
masses |
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The bigger the masses, the bigger the ___ between them. |
gravitational force |
