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# Gravity, Force, Free Fall

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##### Description:

Students will be able to explain that every object exerts gravitational force on every other object in the Universe. They will also distinguish between mass and weight. Students will model, illustrate, and explain the magnitude of the force of gravity depends on the mass and distance of the objects.

Gravity, force, free fall

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Tutorial

## Gravity, Forces

gravity and forces

Source: Langhans

## Accelerated Only: Free fall and projectile motion

Notes on free fall and projectile motion

Source: various

## Summarizing Questions for Gravity, Force, Free Fall: 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.

10.

Source: Langhans;

## Question about your Notes: write your question following the guidelines below:

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 Crystal Kirch