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# Gravity, mass and distance

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Astronomy - Gravity, mass and distance

Astronomy - Gravity, mass and distance

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### Transcript

• 1. GRAVITY, M ASS AND DISTANCE W HAT’S THE ATTRACTION?
• 2. WHAT GOES UP MUST COME DOWN More on this later…….
• 3. GRAVITY Everything in the universe has it Everything is attracted to everything else You are are attracted to your homework, your homework is attracted to your calculator, your calculator is attracted to your pencil and your pencil is attracted to you! If everything is so attractive, WHY DON’T YOU DO YOUR HOMEWORK? What is it?
• 4. GRAVITY The strength of this attractive force (gravity) depends on only two things, the MASS of any two objects and the DISTANCE between the centers of those objects
• 5. WHAT IS THIS ATTRACTIVE RELATIONSHIP? One is very simple: the relationship between mass and gravity. The greater the mass, the greater the force of gravity – pure and simple! It is a direct relationship For example, if an object has 5 times more mass than another object, the first object will exert
• 6. GRAVITY AND MASS Which mass exerts a greater force of gravity and why?
• 7. JUST THE OPPOSITE The relationship between distance and gravity is a little more complicated. As the distance between the objects increases, the force of gravity decreases. This is a type of indirect (or inverse) relationship The farther apart objects are,
• 8. BUT WAIT, THERE’S MORE! Here is the complicated part: If the distance between the objects increases by 3 times, the force of gravity decreases by 9 times Can you figure out the mathematical relationship between 3 and 9? The same relationship exists between 4 and 16 5 and 25
• 9. “PHYSICS TALK” This is referred to as the inverse square law The gravitational effect between objects varies inversely to the square of the distance between them. Huh?
• 10. “SIMPLE TALK” As the distance between two objects get LARGER, the force of gravity between them gets smaller.
• 11. YOU TRY How does the force of gravity change? 1 2 Does the force of gravity decrease by a. 1/2 b. 1/4 c. 1/3
• 12. LET’S SUMMARIZE
• 13. WHAT GOES UP MUST COME DOWN Down is toward the center of the mass Up is the other way Goes and Comes means the motion of the What has been changed Must means it has no choice! Why no choice?
• 14. ANY QUESTIONS?