GRAVITY AND MOTION. WHAT IS GRAVITY?? Gravity- the force that pulls objects towards one another This...
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Transcript of GRAVITY AND MOTION. WHAT IS GRAVITY?? Gravity- the force that pulls objects towards one another This...
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GRAVITY AND MOTION
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WHAT IS GRAVITY??• Gravity- the force that pulls objects towards one another
• This causes all objects in the universe with a mass to be “attracted” to each other
• This means that everything accelerates towards one another
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GRAVITATIONAL FORCE• The strength of the force of gravity depends on two factors:
• The mass of the objects
and
• The distance between the objects
• The bigger the mass, the stronger the
attraction
• The larger the distance, the weaker the
attraction
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THE LAW OF UNIVERSAL GRAVITATION• This law states that the force of Gravity acts between ALL objects in the universe…
THIS IS WHY
• We stay on Earth because we live on the surface(extremely close) and the Earth is massive(large mass)
• The Earth and all other planets revolves around the sun because the sun is so massive
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WHY DON’T WE FEEL IT?• In order for a gravitational attraction to be felt, the mass of one of the objects must be
extremely large…
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SIR ISAAC NEWTON AND ALBERT EINSTEIN• Sir Isaac Newton discovered the concept of gravity, but
couldn't really explain where it came from.
• You might know of his other best known discoveries… Newton’s Laws of Motion?
• Albert Einstein was the first to be able to explain why gravity acts the way that it does
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FREE FALL• When gravity is acting on an object, it is in “free fall”
• On Earth, all objects near the surface accelerate 9.8m/s/s toward the center of the earth
• So, all objects, no matter the shape or size, fall at the same speed…
• Then why doesn’t a piece of paper and a book hit the ground at the same time??
• Thoughts?? Why did a flat piece not work, but the same piece crumpled up did?
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EARTH’S ORBIT AND GRAVITY• Gravity- a force that pulls objects towards one another
• Inertia- an object in motion will always stay in motion unless acted upon by another force
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THE RESULT…• Gravity pulls it in…..
• Inertia keeps it moving…
• Creating orbit…
Inertia
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MASS VS WEIGHT• Mass- the measurement of the amount of matter that makes up an object
• Will always be the same no matter gravitational pull
• Weight- the measurement of the amount of pull of gravity on an object
• Will change depending on gravitational pull
• So… guess your weight on another planet… say mars…and let’s find out