Physics Spring 2015.  Go Over Friction Quest ◦ Take the Friction Quest if missing yesterday  Second Semester Review Assignment  Notes: Work.

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Presentation transcript:

Physics Spring 2015

 Go Over Friction Quest ◦ Take the Friction Quest if missing yesterday  Second Semester Review Assignment  Notes: Work

 Review Mid-Semester Review ◦ Collect Review  Notes: Work and Power  Practice: Work and Power  HW: Complete the Work and Power Assignment

 Which of these would you classify as doing work? ◦ Lifting weights ◦ Climbing stairs ◦ Moving a couch ◦ Trying to push a car that is stuck ◦ Carrying you backpack around school

 Work is the application of any force over a distance.  The equation for work is… Work = Force x distance ◦ If there is an applied force, but no movement is working being done?

 Which requires more work, to move 10 2N books 10m one at a time, or move all of the books at once?

 How did we measure power in the circuits unit?  What did we say that the electricity company sells us actually?

 Power is still the rate of energy used per time  In this unit: ◦ Power = Work (J) / time (sec) ◦ Units: Watts

 A person expends 500J of energy while climbing a flight of stairs. If it takes this person 15 seconds to climb this flight, how much power did this person use?

 If a car uses 100,000J of energy over the course of a 120 second drive. What is the power used?  If one horse can expend 30 Watts of power, how much horsepower was this car using?

 Review Work Assignment  Horsepower Lab  Burning Calories Analysis and Conclusion of lab  HW: Complete Lab if not done in class

 The energy of position or height  This tells us how much work an object could do. GPE = mass * acceleration of gravity * height

 The energy of movement  The amount of energy a moving object has. KE = ½ mass * velocity 2

 Energy can never be created nor destroyed it just changes forms, from GPE to KE.  As GPE decreases, the amount of KE increases.  As KE decreases, the amount of GPE decreases.

 Horsepower Lab  PE v. KE note review  Practice Problems: PE v. KE  Energy Skate Park  HW: PE v. KE assignment

 What is the kinetic energy of a fastball (.149kg) traveling at 26.6 m/s?

 How much potential energy does a ball have that is held motionless at a distance of 100m if the ball has a mass of 2kg.

 Energy Note Check  Work and Energy Practice  LOCOE Exit Slip  HW: None

 Go Over exit slip procedures  Notes: Conservation of energy ◦ Resubmit Exit slip from yesterday  Bowling Ball Demo ◦ Chromebook research  Bowling Ball Explanation Activity

 Energy is NEVER created or destroyed. It is only transformed into a different form of energy.  When an object is at rest above the ground contains 100% potential energy.  An object moving very close to the ground (height = 0m) it contains 100% KE

100% KE 100% GPE

 If a basketball is dropped from a height of 1m, how fast will it be moving when it hits the ground? The basketball has a mass of.3kg.  GPE (before dropped) = mgh =.3kg * 10m/s 2 * 1m 3 J  GPE at top = KE at bottom (Conservation of Energy)  KE (at bottom) = ½mv 2 => ½ *.3kg * v 2  v =.39 m/s

 Review Bowling Ball Lab  Rollercoaster Problem ◦ Conservation of Energy  Before tomorrow Quiz on LOCOE  HW: None, unless you need practice

 Finish Quiz/Rollercoaster Problem  Work and finish Spring Energy Lab  Happy Prom Weekend!!  HW: None

Let me see you all on Monday!