Reflection: Safety Turning Motion - Section 3: Explore

 

As students are engaged in exploring this activity, be sure to demonstrate the correct way to have them spin the washers on strings. Have them lay the washer and string flat on a surface like the floor or their tabletop, then slowly start to spin the washer keeping their hand in a fixed position and not spinning it in the air.  

This is also a good time to show them how they can explore the behavior of the objects once the point around which it is spinning breaks free. I demonstrate this with the class by having them stand up and watch me as I stood in the washer on the floor and then will release it and we watched the path that the washer travels. Washer will travel in a straight line. This happens very quickly since the washer is moving around the point very fast, so this year we used our smart devices to film using slow-motion camera on an iPhone and then watch the playback. Students were able to see the point where the string was released the washer continue traveling in a straight line. There were a lot of "ah-ha's" when we did this.

  A note here about safety
  Safety: A note here about safety
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Turning Motion

Unit 7: Movement of Objects in Space & Time
Lesson 12 of 12

Objective: SWBAT compare circular motion to straight line motion, explain how F=ma works in circular motion, and identify the role of friction in turning motion.

Big Idea: In this lesson students explore how motion in two directions helps explain circular motion.

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3 teachers like this lesson
Subject(s):
Science, Forces and Newton's Laws, Acceleration Formulas, physics, centripetal force, centripetal force, Graphing, time, movement, space
  45 minutes
screen shot 2015 06 01 at 10 40 59 am
 
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