the law of universal gravitation. newton’s law of universal gravitation newton did not discover...
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The Law of Universal
Gravitation
Newton’s Law of Universal Gravitation
Newton Did not discover gravity, but he did discover gravity was universal. In other words, everything pulls on everything else.
States:Every object attracts every other object with a force that for any two objects is directly proportional to the mass of each object, and indirectly proportional to the distance between them.
In Simple Terms:The greater the mass, the greater the attraction. The greater the distance, the weaker the attraction.
Universal Gravitational Constant
There is a constant in value for this universal attraction
Symbol:G
Value:6.67 X 10-11 Nm2/Kg2
Formula:
F= G(m1m2/d2)
Where “d” is the distance between the center of mass for the two objects.
What is “G”?• “G”, or the Universal Gravitational
Constant – first measured by Henry Cavendish 150 years
after Newton’s discovery of Universal Gravitation
• Shows us that the force of gravity is a very weak force
• Easy to notice with large masses, difficult to notice with small masses
Sample QuestionThe gravitational force of attraction between
Earth and the sun is 1.6 x 1023 N. a) What would this force have been if Earth
were twice as massive?b) What would the force be if the distance
doubled?
Sample QuestionOliver, whose mass is 65 Kg, and Olivia, whose
mass is 45 Kg, sit 2.0 m apart in their physics classroom. A) What is the force of gravitational attraction between Oliver and Olivia? B) Why don’t they drift towards each other?
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