2 November Science 7 Continued review of motion–Newton’s Laws–Momentum–Summative project

  • Mindful moment.
  • Previous DSN entry.
  • Read plan in today’s blogpost.
  • Get DSN entry for the day ready.
  • Questions: What is one thing you wish you knew about motion?
  • Is there something happening at a smaller molecular level that has to do with motion?
  • Why don’t we feel the motion of the earth?
  • How will the fan car move with the sail (how will it compare to the motion without the sail)?
  • How can the fact that 2 objects (similar shape) of different mass will fall at the same rate?
  • How does an airplane fly?
  • Why do I need to learn about this stuff?
  • Why are scientists interested in motion?
  • Why does gravity on earth have such an impact on earth? Why?
  • Question about Einstein’ view of space-time–in contrast to Newton’s invariant mass, space, time. Relativity of simultaneity.
  • Bucket of water spinning around–water does not spill–why?
  • What makes water flow in different currents in a river?
  • Is there anything that does not have motion? (important to recognize frame of reference)
  • When we jump why doesn’t the earth move out from under us? Why do we fall straight down?
  • How does water move in a river?
  • Where does gravity come from? Why is there gravity?
  • Would a person’s weight be different at the poles or the equator?
  • What would happen on the earth if everyone jumped at the same time?
  • If you were on an airplane moving with constant velocity, what happens when you jump up?
  • How is the speed of the earth measured?
  • What is first artifact created by humans involving motion?
  • Time travel?
  • What is the critical speed for an airplane to fly?
  • How can the air-pressure water-rocket’s flights with different amounts of water be explained?
  • Does material in stars move within the star?
  • * * * *

Write a note to yourself. This note should remind you of what you know about motion. What you want to be sure to remember as you start your second summative project.

  • * * * *

Missing or IE work. Parents need to know if you are not doing your work.

On October 5th did you add a comment to the blog AND reply to another student’s comment? This is in powerschool.

Also, the WOW preparation classes, do you have entries in your DSN following the 7 items for completeness?

Also, on 29-31 October, do you have the graph of the 3 trials pulling the cart with forces of 8, 10, and 12 pounds as well as written interpretation and comments?

  • * * * *

Send excerpt from your writing. Send one picture from your DSN. (Not a picture of notes.) Send one sketch from your DSN.

  • * * * *

Share your expectation and reasoning regarding the motion of the fan car when the sail is attached.

  • * * * *

See the following visual explanations by 7th graders of the air-pressure water-rocket. No words or numbers are used. What do you notice? What questions do you have?

  • * * * *

Summative project

The exact description will be given after break.

Things to keep in mind:

  • A mysterious device that shows changing velocity will be the focus.
  • You will first propose a mechanism in words and drawing that explains the action of the device. (You did this already with the pull-back car and at the beginning of the year with the walking elephant.)
  • Next, you will try to build something that behaves in the same way as the mystery device, keeping a record of what you try and how your ideas (and trial devices) work.
  • Next, if you need it, you will examine the working device more closely.
  • When you have built a working device, you will investigate the parameters of performance–determining average speeds, changes in velocity, forces, ranges of movement, etc.
  • One component will involve the creation of a visual explanation using no words.
  • A comprehensive and reflection component will involve using what you know and think about motion (with reference to experiences, experiments, discussions we have had this year) to explain the operation of the device you have built.
  • * * * *

If time permits, we will conduct some experiments using a familiar oscillating (goes back and forth regularly) system that, of course, involves changing velocities .

You will be asked to make note of your expectations and reasoning and to compare actual results to what you expected.

  • * * * *

Momentum and the conservation of momentum are very important ideas. How do they relate to Newton’s Laws of Motion? See if the following video references clarify things for you. Perhaps you will have new questions. Be sure to record them.

Newton’s Third Law and Misconception about Newton’s Third Law



Bill Nye on Momentum


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