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Gravity Equation

Web. Gravity Equation. F = force of gravity G = gravitational constant (6*10 -11 ) 0.00000000006 M 1 = mass of body 1 M 2 = mass of body 2 S 2 = distance between M 1 & M 2 squared. M 1 * M 2. G. F = . S 2. Gravity. M 1 * M 2. G. F = .

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Gravity Equation

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  1. Web Gravity Equation F = force of gravity G = gravitational constant (6*10-11) 0.00000000006 M1 = mass of body 1 M2 = mass of body 2 S2 = distance between M1 & M2 squared M1* M2 G F = S2

  2. Gravity M1* M2 G F = 1. The force of gravity is not effected by other bodies present. 2. The force of gravity is equal but oppositely directed. F=ma Newton’s second law S2

  3. Web Gravity M1*M2 F G F = S2 M1 M2 M1A1 = M2A2 If the force is equal and opposite, then: F = MA for both M1A1 = M2A2 M2 is larger than M1 so, A1 must be larger than A2 if they are equal. [Across a crowded room, you and an airplane]

  4. Gravitational Constant G ~ 6*10-11 - a very small number 0.00000000006 What is the attraction between you and the person next to you? What is the attraction between you and the earth? M1* M2 G F = S2

  5. Gravity M1*M2 If masses stay the same, but the distance increases, how does the force of gravity change? G F = S2 M same = F < S increases

  6. Gravity M1*M2 If distance stays the same, but the masses increase, how does the force of gravity change? G F = S2 increase = F > same

  7. Gravity Will a body always have the same mass if the volume remains constant? NO Same volume (size) Density may be different, so masses are different Venus (0.95 radius of earth, density 0.53)

  8. Web Acceleration due to Gravity (g) The acceleration of a body arising from the earth’s gravitational pull. Units are ft/sec2 or m/sec2 At the earth’s surface g is: 9.8 m/sec2 or 32 ft/sec2 (g) depends on position

  9. Acceleration due to Gravity (g) A body falling will continue to accelerate until air friction causes the body to reach a terminal velocity. Acceleration due to gravity is independent of mass F = M A

  10. The Beam Balance and Weight Known mass 1 kg ? unknown mass Gravity Weight = pull of gravity (a force) [ Will it work everywhere? on Earth, another planet? in space? ]

  11. Weight M1*M2 G F = Weight is the force of gravity between me and the earth. 1. How can I reduce my weight? A) move scales to second floor? B) move to the mountains? S2

  12. Web Gravity and the Earth M1*M2 G F = S2 N -Rotates west to east -Velocity greater at equator, zero at poles -Centrifugal force bulges earth at the equator S N -So, the earth is slightly squashed at equator -equator diameter is 42 km > than pole diameter diameter S

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