Physics Unit 3 FORCES

Objectives: 5.3 -Determine Equilibrium Forces -Determine the motion of an object on an inclined plane with and without friction - Determine “Equilibrant” Do Now: Page 128 #17 Homework  Page Practice Problems: odd IN CLASS: Active Read 5.3 Pg 133 Example 5 Pg 134 Example 6 Page Practice Problems: odd Unit 3 Lesson 11

Objectives: 5.3 -Review Equilibrium Forces -Review the motion of an object on an inclined plane with and without friction - Review “Equilibrant” Do Now: Page 135 #40  Homework  Page 142 – 143  Problems: 95 – 101 ALL IN CLASS: Page 142 – 143 Problems: 95 – 97 ALL Unit 3 Lesson 12

REVIEW FRICTION - FORCES Do Now: Edwin "Buzz" Aldrin, the lunar module pilot of Apollo 11, was the second person to walk on the lunar surface, on July 20th/21st of 1969 (depending on where you were on Earth). Aldrin also has the title of the first person to step off of the lunar surface. His steps and those of his commander, Neil Armstrong, made the Sea of Tranquility (their landing site) into one of the most famous places not on our planet.  HOMEWORK: Finalize SUMMARY SHEET  You must know how to do these actions:  Calculate and / or measure applied Forces using Average Accelerations  Calculate and / or measure applied Forces using instantaneous {Derivative} Accelerations  Calculate and / or measure net Forces using instantaneous and average Accelerations  Calculate and / or measure average velocities using net Forces with constant Accelerations  Calculate and / or measure distance and times using net Forces with constant Accelerations  Calculate and / or measure Velocities Vectors using graphical means  Calculate and / or measure Velocities Vectors using algebraic means  Calculate and / or measure Acceleration Vectors using graphical means  Calculate and / or measure Acceleration Vectors using algebraic means  Calculate and / or measure Frictional Forces using constant Accelerations  Determine Kinetic and Static coefficients of friction  Determine Equilibrium Forces  Determine the motion of an object on an inclined plane with and without friction  Determine “Equilibrant ”  Review:  F net = F applied – F friction  ma net = ma applied – μmg Cosθ  Review the BIG FIVE Unit 3 Lesson 13

REVIEW FRICTION - FORCES Do Now: Page 143 # 103  In Class: TEST your SUMMARY SHEET  You must know how to do these actions:  Calculate and / or measure applied Forces using Average Accelerations  Calculate and / or measure applied Forces using instantaneous {Derivative} Accelerations  Calculate and / or measure net Forces using instantaneous and average Accelerations  Calculate and / or measure average velocities using net Forces with constant Accelerations  Calculate and / or measure distance and times using net Forces with constant Accelerations  Calculate and / or measure Velocities Vectors using graphical means  Calculate and / or measure Velocities Vectors using algebraic means  Calculate and / or measure Acceleration Vectors using graphical means  Calculate and / or measure Acceleration Vectors using algebraic means  Calculate and / or measure Frictional Forces using constant Accelerations  Kinetic and Static coefficients of friction  IN CLASS Review:  F net = F applied – F friction  ma net = ma applied – μmg Cosθ  Review the BIG FIVE  Page 143 #’s 104  Page 145 #’s 1 – 7 all Unit 3 Lesson 14

PRINT This and the NEXT SLIDE as a test Force and Friction Review THIS IS A TEST NO People No Internet PRINT This and the NEXT SLIDE as a test Do Now: Quick Quiz Apollo 11 Flight : Apollo 11 First landing on moon. Apollo 11 (AS-506) - with astronauts Neil A. Armstrong, Michael Collins, and Edwin E. Aldrin, Jr., aboard - was launched from Pad A, Launch Complex 39, KSC, at 9:32 a.m. EDT July 16. Total mass of the Saturn V Rocket and Apollo space craft at launch X10 6 Kg. Total thrust of First Stage at Launch: X10 7 Newton's Total thrust of First Stage just before Engine Cut Off: X10 7 Newton's The First Stage Mass of X 10 6 Kg (5, 017, 000 lbs) of the Saturn V rocket lifts the entire vehicle to an altitude of X10 4 m (38 miles) and reaches a speed of X10 4 m/s (6,000 mph) in 2 minutes and 30 seconds ( sec). Just before First Stage engine cut off, the total mass of the rocket is X10 5 Kg The Second stage of the rocket Mass of X 10 5 Kg (1, 101, 000 lbs and achieves a speed of X10 4 m/s (14,000 mph) and lifts the vehicle to X10 5 m (118 miles) in 5 minutes and 59 seconds. The Third stage of the rocket Mass of X 10 4 Kg (25,000 lbs) puts the remaining APOLLO space craft and LEM in a circular Earth orbit achieving a speed of X10 4 m/s (17, 400 mph) in 8 minutes and 00 seconds. Homework : Finalize Summary Sheet for Friction and Forces TEST next class Unit 3 Lesson 15

Force and Friction Review Homework : Finish Do Now and Apollo 11 Problem and Finalize Summary Sheet for Friction and Forces 1) What is the initial acceleration of the Saturn V Rocket at Launch? _________________ (________) 2) What is the final acceleration of the Saturn V Rocket just before First Stage engine cut off at seconds into the flight? _________________ (________) 3) What is the average acceleration of the Saturn V Rocket from Launch to just before First Stage engine cut off at seconds? _________________ (________) 4) What is the Maximum Acceleration (in “g’s”) that the Apollo 11 astronauts felt in from Launch to just before First Stage engine cut off at seconds? _________________ (________) Unit 3 Lesson 15 PRINT This and the PREVIOUS SLIDE as a test

1) What is the initial acceleration of the Saturn V Rocket at Launch? _________________ (________) Total thrust of First Stage at Launch: X10 7 Newton's Total mass of the Saturn V Rocket and Apollo space craft at launch X10 6 Kg. F = ma  a = F / m a= X10 7 Newton's / X10 6 Kg. a= X10 1 m/s 2 Unit 3 Lesson 15 ANSWERS

2) What is the final acceleration of the Saturn V Rocket just before First Stage engine cut off at seconds into the flight? _________________ (________) Total thrust of First Stage just before Engine Cut Off: X10 7 Newton's Just before First Stage engine cut off, the total mass of the rocket is X10 9 Kg a = F / m = X10 7 Newton's / X10 5 Kg = X10 1 m/s 2 Unit 3 Lesson 15 ANSWERS

3) What is the average acceleration of the Saturn V Rocket from Launch to just before First Stage engine cut off at seconds? _________________ (________) ( X10 1 m/s X10 1 m/s 2 ) / 2 = X10 1 m/s 2 average “applied” acceleration Vf = X10 4 m/s Vi = 0.00 m/s T = 150 sec a = {Vf – Vi} / (t) = X10 4 m/s / 150 sec = X10 1 m/s 2 Unit 3 Lesson 15 ANSWERS

4) What is the Maximum Acceleration (in “g’s”) that the Apollo 11 astronauts felt in from Launch to just before First Stage engine cut off at seconds? _________________ (________) = X10 1 m/s 2 = “g’s” Or = X10 1 m/s 2 = 9.13 “g’s” Unit 3 Lesson 15 ANSWERS

Unit 3 Lesson 15

In Class  cwZb2mqId0A cwZb2mqId0A  Neil Armstrong Apollo 11 (2:30) &feature=related Myth Busters //Shadows (4:00) E&feature=related Gravity (5:40) eature=related Fake Moon Landing (7:00) feature=channel&list=UL Myth Busters Flag (4:00) Y&feature=bf_prev&list=UL5taIxlNA_Lw Myth Busters Buzz Aldrin in Shadow (4:00) Physics I Unit 1 - One Dimentional Motion Unit 3 Lesson 16