Energy and Gravity

DO NOW MONDAY What does the Law of Conservation of Energy say? What are potential energy and kinetic energy?

Learning Targets Explain the Law of Conservation of Energy. Explain the direction and sequence of energy transfer.

Potential and Kinetic Energy Potential energy: stored energy Kinetic energy: energy of motion Potential energy can be transformed into kinetic energy and vice versa as things move and stop or speed up and slow down.

Potential and Kinetic Energy https://www.youtube.com/watch?v=7K4V0NvUxRg&list=PLNP7mXrp0yBJtpHIMpRBEZ9rxTfZW0kae

Roller Coasters On a roller coaster, potential energy is transformed into kinetic energy and back into potential energy as the coaster moves along the track, up and down the “hills”.

Roller Coasters

Roller Coasters The higher the coaster (or anything ) is off the ground, the more potential energy it has. This is called gravitations potential energy. The more or faster something is moving, the more kinetic energy it has.

Roller Coasters

Roller Coasters Identify which letter(s) in the picture indicates where a coaster car would have: The greatest potential energy The greatest kinetic energy Transformation from potential to kinetic energy Transformation from kinetic to potential energy

Roller Coasters https://www.youtube.com/results?search_query=kinetic+and+potential+energy+and+roller+coasters

Roller Coasters Requirements: 100 points possible Successful (must travel entire course without stalling) 25 points 2 hills (at least) 20 points 1 corkscrew or loop 10 points Name of coaster (no copycats) 5 points Initial design drawing (draw at bottom of this page) 10 points Final drawing (on back of this page) 10 points Drawing should be accurate and look like your coaster. Be sure to indicate measurements of your coaster such as heights of hills and distance between hills Indicate on your drawing the following 20 point (You can indicate each point with a letter on your final drawing) Point of greatest potential energy Point of greatest kinetic energy Point(s) where potential is changing to kinetic Point(s) where kinetic is changing to potential

DO NOW TUESDAY Explain the energy transformation that is happening in the picture below.

Learning Targets Explain the Law of Conservation of Energy. Explain the direction and sequence of energy transfer.

DO NOW WEDNESDAY Give a definition of gravity in your own words.

Learning Targets 2.1 Explain gravity’s effects on different objects. 2.2 Describe the relationship between mass and gravitational force. 2.3 Describe the relationship between distance between objects and gravitational force. (different planets)

Gravity Use the textbook (pages 58-61) to answer the questions about gravity below in your notebook on page . Be sure to write your answers in complete sentences. 1. What is the definition of gravity? 2. What is true about the rate at which all objects on Earth free fall due to gravity? 3. Explain what air resistance does to the rate at which objects fall. 4. What two things does gravity depend upon? 5. Explain how mass affects gravity. 6. Explain how the distance between two objects affects gravity.

Gravity The force that pulls objects toward each other. A force that acts between any two objects in the universe.

Acceleration Due to Gravity All objects free fall at the same rate due to gravity. This rate is 9.8 m/s2

Gravity Demonstration Drop 1: Watch the piece of paper and the ball drop. Drop 2: Watch the paper wad and the ball drop. What was different? Why do you think there was a difference between the first drop and the second drop?

Air Resistance Is a force that acts against gravity Is a force that acts more on lightweight objects with more surface area, making them fall slower than expected. Can make objects fall at different rates

Gravity and Air Resistance Even though gravity makes things fall with same acceleration (at the same rate), air resistance can cause different objects to fall at different rates and hit the ground at different times. Lightweight objects with more surface area have more air resistance pushing against them and so fall slower and hit the ground later than heavy objects with smaller surface area.

Gravity Demonstration Can you explain the Gravity demonstration with the paper and the ball better now?

Factors Affecting Gravity

Bill Nye’s Thoughts on Gravity https://www.youtube.com/watch?v=ncu2NfiaRDk After watching the video, answer the questions on the sheet provided.

DO NOW FRIDAY List the two things that can affect gravity. Explain how each of these things affects gravity.

Learning Targets 2.1 Explain gravity’s effects on different objects. 2.2 Describe the relationship between mass and gravitational force. 2.3 Describe the relationship between distance between objects and gravitational force. (different planets)

DO NOW MONDAY QUIET Study for gravity quiz. QUIZ EXPECTATIONS Do your best. (Eyes on own paper.) Finished? (Turn your quiz over and write a note, draw a picture for Mrs. Dyer on the back.)

Learning Targets 2.1 Explain gravity’s effect on different objects. 2.2 Describe the relationship between mass and gravitational force. 2.3 Describe the relationship between gravitational force and the distance between objects. (different planets) 2.4 Identify unit used to measure gravitational force. 3.1 Describe the relationship between motion and energy. 3.2 Explain the difference between potential and kinetic energy. 3.3 Describe how an object’s position affects potential energy. (Relate gravity to potential energy) Product Target: Design a functional roller coaster that demonstrates potential and kinetic energy at various points.

AGENDA MONDAY 1. Finish and Turn in Roller Coaster drawing with measurements and points labeled: Point of most potential energy Point of most kinetic energy Point(s) where kinetic is transforming to potential Point(s) where potential is transforming to kinetic 2. Sign out a ChromeBook and complete Gravity Pitch Gizmo and Gravity Force Lab. (See my teacher website for links to these activities.)

DO NOW TUESDAY kahoot.it Learning Target: Login in: kahoot.it Learning Target: I can illustrate mastery of energy and gravity learning targets on a written test.

DO NOW THURSDAY Test 3 Analysis Label a sheet in the back of your notebook with each of the following and leave space to write answers. Test 3 Analysis Questions I missed: Targets I missed: How much I studied: Why I studied this much:

THURSDAY AGENDA Test Analysis Redo Test and/or open response, if necessary Write an article summary: Read the article and write a 3 paragraph article summary according to the instructions below: Paragraph 1: Paragraph 2: Paragraph 3: