1. THIS PAGE WILL BE GONE IN 5 mins BE SURE TO HAVE YOUR ID VISIBLE AROUND YOUR NECK, NO NON- POLY ATTIRE! DRILL: WORK @ an angleDate: Jan 25, 2012 A 500 N force is applied at an angle of 15o to the horizontal to move a 25 kg object at a constant speed for a horizontal distance of 10 m WHAT IS THE WORK DONE? OBJECTIVE Define and solve word problems on power. HOMEWORK Copy and answer no. 38-39 & 46-47 of page 278 no. 89-91 of page 281 [ you have 4 days! ] no. 89-91 of page 281 [ you have 4 days! ]

2. THINK ABOUT! Who does more work a person A pushing an object 5 m with a force of 10 N in 2 seconds or a person B pushing an object 2.5 m with a force of 20 N in a second? Who will you ask to help you do work? Why?

3. 3 What is POWER? Power is the rate at which work is done. It is the work/time ratio.

4. What is the UNIT OF POWER? Watt is equivalent to a Joule/sec

5. POWER, FORCE & VELOCITY

6. PRACTICE PROBLEM Ben Pumpiniron elevates his 80-kg body up the 2.0-meter stairwell in 1.8 seconds. If this were the case, then we could calculate Ben's power rating

7. PRACTICE PROBLEM When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2 seconds. What is the power delivered by the student's biceps?

8. CLASSWORK PART 1: Answer the worksheet provided PART 2: at the back of the worksheet, SHOW WORK TO YOUR ANSWER ON PROBLEMS NO. 26-30 on page 242 … do not copy the problems but SHOW KNOWNS AND UNKNOWNS.

9. WRAP-UP Copy and answer OR answer in a complete sentence What is the equation for power and its units? REMINDERS! Only absences/ missed work with pink slips can be made up MISSING A DETENTION = 0 IN ALL OUTPUTS FOR THAT DAY [includes notebook] COACH CLASS Tues & Thurs, 3:15 – 4:00, RM 127 QUIZ ON work power & energy on FEB 3 Notebooks will be checked on FEB 3…