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April 9 th , 2014

April 9 th , 2014. Homework : Read pgs. 64-67: Define Centripetal force, answer section assessment questions (pg. 67) 2 a, 2 b.- on pg. 18 in your notebook.

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April 9 th , 2014

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  1. April 9th, 2014 • Homework:Read pgs. 64-67: Define Centripetal force, answer section assessment questions (pg. 67) 2 a, 2 b.- on pg. 18 in your notebook. • Do Now: Write down homework, Open your note to pg. 18: Make a list of all the forces you think act on a rollercoaster and its riders.

  2. April 10, 2014 Homework: Read 64-67 if you did not last night Do Now: Update T.O.C: • pg. 17: Roller Coaster forces Video- glue/ tape in sheet • Pg. 18: Circular Motion and Satellites • Pg. 19 : Circular motion and Satellites activity • Leave notebooks open to page 17- • Open textbooks to page 64.

  3. According to the video-What types forces & motion act on a roller coaster?

  4. Define Centripetal Force • Centripetal Force: Any force that causes an object to move in a circular path • Centripetal – means “center- seeking” • Keeps you in your seat when you are moving through a roller coaster loop– pulling you towards the center

  5. Let it Roll- Circular Motion Activity-pg. 19 in your notebook • Predict: Draw a picture of the, “Pac-man” plate and draw an arrow in the direction you predict the ball will go. Then write one-two sentences describing your prediction. • Activity Instructions- With you partner • Using the ping pong ball- roll the ball once around the inner rim of the paper plate. • Record the direction the ball rolls once it reaches the cut out portion of the plate.- Draw the plate again with an arrow showing the direction t traveled in. • Write the reason why you think the objected traveled in the direction it did

  6. April 11, 2014 Homework:Enjoy your Spring Break! Nothing is assigned! If you are not going away, if you want, Look for a Science News article- What is happening today in science.. Any new break through in Science /Technology?? Do Now: - Open Notebook to pg. 18- if you didn’t show me the homework yesterday, Please do so Now -Open textbook to pg. 65

  7. Let it Roll Activity -Results • What Direction did the ball travel? • What is the reason why you think the object traveled in the direction it did?

  8. http://www.pbslearningmedia.org/resource/phy03.sci.phys.mfw.roller/centripetal-force-roller-coaster-loops/http://www.pbslearningmedia.org/resource/phy03.sci.phys.mfw.roller/centripetal-force-roller-coaster-loops/

  9. How does centripetal force relate to the motion of a satellite? What is a satellite? (Quest. 2A) • An object that orbits other object in space. • Artificial satellites- man –made (communications, military, weather etc…) • For a satellite, centripetal force is the gravitational force that pulls the satellite toward the center of the Earth.

  10. Turn to pg. 66-67- Look at Figure 20 • Why does that horizontally moving projectile eventually fall to the ground? • Because of gravity pulls it downward

  11. What causes satellites to stay in orbit rather than falling toward the Earth? • Inertia and the force of gravity. It has enough space and speed to follow earths circular orbit. • Gravity causes the satellites to continuously fall toward the earth. (pulling it downward, like the ball) Since the Earths surface is curved, satellites can travel around the Earth continuously • Move in a continuous circle means it is accelerating and is moving at a fast enough velocity to follow a circular orbit. At least 7,900 m/s

  12. What if there was no gravity to pull the object, or the object increased in velocity?

  13. Write a one sentence summary that describes how satellites stay in orbit and why your pressed in your seat, during a ride through a roller coaster loop. (Use Centripetal Force in your summary)

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