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Students will be able to explain Newton’s Law of Universal Gravitation. In addition, students will explain the concept of gravity and gravitational force in relationship to mass. Mass and Weight will also be discussed. Gravity is dependent on mass and distances between objects will be discovered as well. 

This is your notes. Be sure to stop and rewind when you need to.

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Gravity, Universal Gravitation, and Free Fall

This is a longer video, but has a great deal of important info. Take good notes: be sure to pause, rewind, and stop as necessary.

Source: Langhans and various other educators

Gravity: IPad Version

Try this one if you are having trouble.

Source: Langhans and various other educators

Summarizing Questions for Gravity: have the answers under your notes

1.Why is there a gravitational attraction between all objects?


2. What would happen to the gravitational attraction between two objects if the mass of the one of the objects doubled?


3. What two variables affect gravitational force between objects?


4. Standing at the same location, which organism would have the GREATEST gravitational attraction to the earth: your pet dog, your pet ant, your pet opossum, or your pet elephant? Explain your answer.


5. Explain the difference between mass, weight, and gravity. Include examples of each and their units.


6. On a space walk out in space, astronauts need the space shuttle’s mechanical arm and small rocket thrusters to move a massive new satellite into position. They are not strong enough to move it with their own muscle because the satellite has too much: inertia, length, volume or weight. Explain your answer.


7. Joe is the best baseball player in the world. He can throw a baseball faster than anyone. If the mass of the baseball was increased by 50%, but he applied the same force as he did to a lighter baseball, would Joe be happy about the results? Why or why not?


8. Four wrestlers step on a scale for a tournament. Wrestler A weighs in at 170 pounds; wrestler B weighs in at 168 pounds; wrestler C weighs in at 171 pounds; and wrestler D weighs in at 169 pounds. Which of these wrestlers experiences the greatest force due to gravity and why?


9. Determine the force of gravitational attraction between the earth 5.98 x 1024 kg and a 70 kg boy who is standing at sea level, a distance of 6.38 x 106 m from earth's center. 


10. Imagine that a city has been built on the Moon, inside a large, pressurized dome so that
humans can breathe normally without using a space suit. Compare each of the
following on the Earth vs. inside this dome on the Moon.
(a) your weight;
(b) your mass;
(c) the largest speed you could throw a baseball;
(d) the highest altitude you could throw a baseball;
(e) your ability to push a heavy box along the floor;
(f) your ability to carry a heavy box; and
(g) the distance needed to stop a car traveling at 20mph.

Source: Langhans and various educators

Question- asking Higher Order Thinking (HOT) questions; use the following as your guide:

Question- asking Higher Order Thinking (HOT) questions; use the following as your guide:
1. A question that you are still confused about (be specific, include which part of the video, etc)
2. A question that connects the videos together (i.e. asking about the relationship between the content)
3. A question you think you know the answer to, but you want to challenge your classmates with
Use your Unit Plan to help with question starters

Source: inspired by C. Kirch