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A cat lies on the floor.

Do Now: Please REWRITE the problems/answers (can bullet point) on loose leaf with enough detail that you remember the problem for an open notes quiz. #1. #2. A cat lies on the floor.

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A cat lies on the floor.

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  1. Do Now: Please REWRITE the problems/answers (can bullet point) on loose leaf with enough detail that you remember the problem for an open notes quiz. #1 #2 • A cat lies on the floor. • Can you say that NO FORCE acts on the cat? Or, is it correct to say that no net force (in other words, ZERO NET FORCE) acts on the cat? • EXPLAIN your answer (why/ how you answered the way you did etc.) • Consider 2 forces: one having a magnitude of 20N, and the other a magnitude of 12 N. • What is the maximum net force possible for these 2 forces? • What is the minimum net force possible for these 2 forces?

  2. #2 • ANSWER : MAXIMUM resultant occurs when they are parallel, in the same direction • 20N + 12N = 32 N • #1 • MINIMUM resultant occurs when they are in OPPOSITE directions • 20 N – 12 N = 8 N ANSWER: It is correct to say no net force. Both gravity (cat weight) and support force (thanks floor) act on cat. They cancel to zero net force, but there are still forces!

  3. Exit Slips from last class • Take yours back and review with peers… we will go over answers in a minute! • Also, take out your HW that was due today.. We are reviewing that, too…

  4. Make any necessary corrections on yours!

  5. An object in mechanical equilibrium is stable, without changes in motion.

  6. Remember from last class… A NET force is needed to change an object’s state of motion. If there is zero net force, then there is zero change in the object’s state of motion Remember from last class… If an object is… • At rest OR • Moving in a straight line at the same speed Then the net force on that object is zero…there is no net force!

  7. With ASSIGNED lab groups.. Please complete Ch. 2 POGIL #1:Spring Scales. Check in w/teacher at • We will not go over as a class – it is your group’s responsibility to pace accordingly and check in at • Take the time to explain answers, but be EFFICIENT. There can always be a pop quiz on material you are expected to complete! • Anything that you do not finished today is expected to be completed at home so that you are up to date next class. (However, you have more than enough time to complete this during class… having to complete work at home means you chose to allocate your time poorly.) • We are stopping with 5 minutes left in class to review HW and complete an exit slip.

  8. Exit Slips! • Take an exit slip and SILENTLY write your answers (THREE questions!) • Then, we will review answers on Powerpoint. When the answer comes up, you will MAKE YOUR CORRECTIONS in a different color(or, circle them, etc…do something to make them stand out to me!) • These are not graded, so it’s ok if you make corrections! • To be turned in when done. These will be returned to you next class.

  9. 2.3Support Force think! Suppose you stand on two bathroom scales with your weight evenly distributed between the two scales. What is the reading on each of the scales? What happens when you stand with more of your weight on one foot than the other?

  10. 2.3Support Force think! Suppose you stand on two bathroom scales with your weight evenly distributed between the two scales. What is the reading on each of the scales? What happens when you stand with more of your weight on one foot than the other? Answer: In the first case, the reading on each scale is half your weight. In the second case, if you lean more on one scale than the other, more than half your weight will be read on that scale but less than half on the other. The total support force adds up to your weight.

  11. 2.5Vectors think! Two sets of swings are shown at right. If the children on the swings are of equal weights, the ropes of which swing are more likely to break?

  12. 2.5Vectors think! Two sets of swings are shown at right. If the children on the swings are of equal weights, the ropes of which swing are more likely to break? Answer: The tension is greater in the ropes hanging at an angle. The angled ropes are more likely to break than the vertical ropes.

  13. 2.5Vectors think! In your own words, please describe why it is more difficult to do pull-ups with one arm, instead of 2. Include key terms we have used today. You will not be given the answer for this today… Do your best 

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