Honors methods of motion-day 8-per4


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Honors methods of motion-day 8-per4

  1. 1. Honors Physics <ul><li>Good Morning! </li></ul><ul><li>Please… </li></ul><ul><ul><li>Take out your vocabulary and hand them in to the bin in the front of the room (make sure your name is on it) </li></ul></ul><ul><ul><li>Work on the warm-up problem: </li></ul></ul><ul><ul><ul><li>Convert the following so that they are expressed as a digit between 1-999, using a prefix. </li></ul></ul></ul><ul><ul><ul><ul><li>0.0035 Volts </li></ul></ul></ul></ul><ul><ul><ul><ul><li>2.5x10 5 grams </li></ul></ul></ul></ul>
  2. 2. Housekeeping… <ul><li>**Notice** the homework assignment due Tuesday has changed </li></ul><ul><ul><li>Different problems from the text than were originally assigned. </li></ul></ul><ul><ul><li>Lab not due on Monday (probably due Wednesday) </li></ul></ul>
  3. 3. Homework Solutions: <ul><li>4. a) 105 km/hr </li></ul><ul><ul><li>b) 29 m/s </li></ul></ul><ul><ul><li>c) 95 ft/sec </li></ul></ul><ul><li>5. a) 203 miles </li></ul><ul><ul><li>b) 61 miles/hr </li></ul></ul><ul><li>7. a) 4.29 m/s </li></ul><ul><li>b) 0 m/s </li></ul><ul><li>9. 2.7 min </li></ul>
  4. 4. Homework Problem #5 <ul><li>You are driving home from school steadily at 65 miles/hour for 130 miles. It then begins to rain and you slow to 55 mph. You arrive home after driving 3 hours and 20 minutes. </li></ul><ul><ul><li>(a) how far is your hometown from school? </li></ul></ul><ul><ul><li>(b) What was your average speed? </li></ul></ul><ul><li>Steps for solving: </li></ul><ul><ul><li>Draw and write out the information given </li></ul></ul><ul><ul><li>Identify unknown values </li></ul></ul><ul><ul><li>Identify equations to use </li></ul></ul><ul><ul><li>Hint: break the problem into two trip segments </li></ul></ul>
  5. 5. <ul><li>The RATE of CHANGE of VELOCITY </li></ul><ul><li>  Change = FINAL - INITIAL </li></ul><ul><li> v = Final velocity – Initial velocity </li></ul>Acceleration – The Definition
  6. 6. <ul><li>A Cessna Aircraft goes from 0 m/s to 60 m/s in 13 seconds. Calculate the aircraft ’s acceleration. </li></ul>4.62 m/s/s Example
  7. 7. <ul><li>Example: The Cessna now decides to land and goes from 60 m/s to 0 m/s in 11 s. Calculate the Cessna ’s ? </li></ul>acceleration - 5.45 m/s/s Example
  8. 8. Constant Velocity Car Lab <ul><li>Table & graphs should be completed on a separate piece of graph paper with ruler </li></ul><ul><li>Find average time </li></ul><ul><li>Find change in time: time it took for car to travel each of the 0.2 m length segments </li></ul><ul><ul><li>Ex: time to go from 0.0m to 0.2m, time to go from 0.2m to 0.4m, etc. </li></ul></ul><ul><li>Instantaneous velocity = 0.2 m ÷ average time for length segment </li></ul>
  9. 9. Problem-Solving Techniques <ul><li>Read & re-read the whole problem carefully. </li></ul><ul><li>Draw a diagram or picture of the situation. </li></ul><ul><ul><li>Include coordinate axes: usually use x-axis to the right as positive, x axis to the left as negative. </li></ul></ul><ul><li>Write down the “known” and “unknown” quantities </li></ul><ul><li>Think about the physics principles that apply </li></ul><ul><li>Consider which equations relate the quantities involved. </li></ul><ul><ul><li>Make sure the equation is valid to use for that problem </li></ul></ul><ul><ul><li>You may need to use a series of equations to solve the problem – not just one. </li></ul></ul><ul><li>Carry out the calculations . Round at the end of the calculation only. </li></ul><ul><li>Review the problem : is it a reasonable solution? </li></ul><ul><li>Do a check of work by checking units: dimensional analysis </li></ul>