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Gravitational Forces Between Objects
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- Show answers to discussion questions
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- Gravity is an attractive force between ANY two objects.
- The force of gravity depends on the mass of the objects and their distance apart.
- This lesson will also explore the difference between mass and weight.
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Discussion Questions
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Before VideoWhat are some examples of gravity?ANSWER
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Some examples of gravity are things falling down to the ground or the force that hold us to Earth.
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A force is something that makes another object move (i.e., a push or a pull), like when you push a door open.
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Magnets can make some things, such as metal, move without touching them.
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Yes, they would hit the ground at the same time because they are the same object.
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The Sun’s gravitational force keeps Earth in orbit. Earths gravitational force keeps the Moon in orbit.
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Astronauts need to know about gravity because they go out into space where there is no gravity. Construction workers need to know about gravity because they work way up on tall buildings and don’t want to fall. The people who wash the windows on the outside of buildings also need to know about gravity.
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After VideoExplain one way gravity affects objects.ANSWER
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Gravity is the force that pull objects to the center of Earth.
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The Moon affects the tides on Earth. High tide is caused by the Moon’s gravity.
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Gravity is not the same in all places. For example, if you were high up on a mountain, you would weigh less because the force of gravity is less.
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Although the Sun is very far way, its size keeps Earth in its orbit because of the gravitational force between the two masses.
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Resistance is a force that acts in the opposite direction. If two of the same kind of umbrellas were dropped from the same height at the same time, they would hit the ground together. But if one umbrella were open, it would have more resistance and hit the ground after the one that was closed.
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Mass is the amount of matter that makes up an object (number of molecules an object has). Weight is measured on a scale and can change based on the force of gravity.
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Vocabulary
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Gravity
DEFINE
A force that accelerates (or pulls) an object toward the center of Earth.
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Mass
DEFINE
The amount of matter that makes up an object. Mass does not change based on where you are.
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Weight
DEFINE
A measurement that is taken using a scale and is determined by the pull of gravity. Weight can vary based on where you are and the pull of gravity in that area.
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Resistance
DEFINE
A measure of a force acting in the opposite direction.
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Acceleration
DEFINE
An increase in the rate or speed of something.
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Atmosphere
DEFINE
The gases that surround Earth or another planet.
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Newton’s law of universal gravitation
DEFINE
Every particle attracts every other particle with a force that is proportional to their masses and inversely proportional to the square of distance between them.
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Force
DEFINE
Any interaction that can change the motion of an object.
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Galileo
DEFINE
An Italian astronomer, physicist, and engineer. He is sometimes known as the “Father of Observational Astronomy.”
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Issac Newton
DEFINE
An English mathematician and physicist who is known for formulating the theory of universal gravity. Newton’s three laws are commonly studied in middle and high school.
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Gravity
DEFINE
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Reading Material
Download as PDF Download PDF View as Separate PageWHAT ARE GRAVITATIONAL FORCES BETWEEN OBJECTS?On Earth, gravity gives weight to objects and pull objects toward the center of Earth. The Moon also affects this force and is responsible for the changing ocean tides. Gravitational force also occurs naturally between any objects that have mass or energy (including planets, stars, and galaxies) and pulls them together.
To better understand gravitational forces between objects…
WHAT ARE GRAVITATIONAL FORCES BETWEEN OBJECTS?. On Earth, gravity gives weight to objects and pull objects toward the center of Earth. The Moon also affects this force and is responsible for the changing ocean tides. Gravitational force also occurs naturally between any objects that have mass or energy (including planets, stars, and galaxies) and pulls them together. To better understand gravitational forces between objects…LET’S BREAK IT DOWN!
Relationship Between Mass and Gravity
The force of gravity depends on the size (mass) of an object. The bigger the object, the stronger the force of gravity. The force of gravity will also depend on how close or far apart one object is from another. For example, if two objects are close together, the force of gravity is greater than if they were farther apart.
Relationship Between Mass and Gravity The force of gravity depends on the size (mass) of an object. The bigger the object, the stronger the force of gravity. The force of gravity will also depend on how close or far apart one object is from another. For example, if two objects are close together, the force of gravity is greater than if they were farther apart.Relationship Between Mass and Weight
Mass and weight are different but can both be measured by standard units. Mass is the amount of matter an object contains, and mass does not change when you move an object from one place to another. Weight is the amount of force (gravity) acting on an object, and weight can change based on where an object is located.
Relationship Between Mass and Weight Mass and weight are different but can both be measured by standard units. Mass is the amount of matter an object contains, and mass does not change when you move an object from one place to another. Weight is the amount of force (gravity) acting on an object, and weight can change based on where an object is located.The Moon Has Gravity
The Moon’s gravity pulls at Earth and causes predictable ocean tides. High tide is when the Moon’s gravitational pull is the strongest, and low tide is when the pull is the weakest. Lakes can also be affected by the Moon’s gravitational pull, but on a much smaller scale.
The Moon Has Gravity The Moon’s gravity pulls at Earth and causes predictable ocean tides. High tide is when the Moon’s gravitational pull is the strongest, and low tide is when the pull is the weakest. Lakes can also be affected by the Moon’s gravitational pull, but on a much smaller scale.Sir Isaac Newton
Sir Isaac Newton was an Englishman who lived from 1643 to 1727. He is known in the science world for his laws of motion. Newton’s three laws of motion are commonly used in education to help students understand motion and the mathematical formulas that can be used to explain and predict motion.
Sir Isaac Newton Sir Isaac Newton was an Englishman who lived from 1643 to 1727. He is known in the science world for his laws of motion. Newton’s three laws of motion are commonly used in education to help students understand motion and the mathematical formulas that can be used to explain and predict motion.Careers in Science: Astronomer
Astronomers are scientists who study in the science field of astronomy. Astronomers observe and study objects in space such as stars, moons, planets, asteroids and comets. Astronomers use observations and mathematical models to try to figure out what space looked like in the past and make predictions about what could happen in the future.
Careers in Science: Astronomer Astronomers are scientists who study in the science field of astronomy. Astronomers observe and study objects in space such as stars, moons, planets, asteroids and comets. Astronomers use observations and mathematical models to try to figure out what space looked like in the past and make predictions about what could happen in the future. -
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Why does a feather fall slower than a rubber ball? How could you make them hit the ground at the same time?
Why are we pulled to the center of the Earth and not into the much larger sun?
What happens to the strength of the gravitational force between two objects if they get CLOSER? What if one object gets SMALLER?
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