GR10 MECHANICAL ENERGY by Lizelle Swanepoel https://padlet.com/lizellexs/5urg1rtguuqa58i3 en-us 2020-12-27 11:34:37 UTC 2025-07-31 08:37:30 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rugbyball.png IDENTIFY THE LINK BETWEEN THE GIFS BELOW AND ENERGY CONVERSION lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914025 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914025 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914026 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914026 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914028 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914028 KINETIC ENERGY lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914030 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914030 DEFINITIONS lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914031 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914031 FORMULAE lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914032 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914032 NOTES - additional and exercises lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914033 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914033 ENERGY AND WORK lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914034 DEFINITION: 
  • Energy is the ability to do work.
  • Work is Energy transferred.

  • Also:
Work = ​The product of force and distance moved by an object.
(NOTE: The force is the component of the force in the direction of motion)

Equation for WORK:     W = F x d

  • Therefor energy and work are interchangeable physical quantities.
E = W  (Both have the unit of Joules)

  • When a system does work, its energy content will decrease.
  • Conversely, a system on which work is being done will have an increase in its energy content.
]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914034 WORK lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914035 Definition:
Work = The product of force acting on an object and the distance moved.                            
Formula:
W = F.d

Motion of the object must be in the direction of the component of the applied force acting on the object.]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914035 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914036 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914036 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914037 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914037 MECHANICAL ENERGY IN A WATERFALL lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914041 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914041 Energy in a Nutshell lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914042 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914042 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914048 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914048 KINETIC + POTENTIAL = MECHANICAL ENERGY lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914050 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914050 Principle of Conservation of mechanical energy in action lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914051 The law states:
The total mechanical energy of a closed system remains constant.

For a pendulum swing:
Tot E mechtop = Tot E mechbottom
               mgh + 0 = 1/2mv2 + 0

Check out the Prof Walter Lewin video above. ]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914051 PENDULUM PROBLEM lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914054 Do the following problem:
A metal ball of mass 0,2 kg is tied to a light string to make a pendulum. The ball is pulled to the side to a height (A), 0,1 m above the lowest point of the swing (B). Air friction and the mass of the string can be ignored. The ball is let go to swing freely.
  1. Calculate the potential energy of the ball at point A.
  2. Calculate the kinetic energy of the ball at point B.
  3. What is the maximum velocity that the ball will reach during its motion?
]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914054 Roller Coasters and Mechanical Energy lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914056
  • 1817 - First roller coaster features cars that locked onto the track (Paris)
    • ]]>     2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914056     1885 - “CYCLONE”: 1st Powered Chainlift Roller Coaster; Coney Island, Brooklyn, New York lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914057 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914057 Roller Coaster Physics Calculations lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914058 Mall of America "Spongebob Squarepants Plunge"]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914058 Build your own roller coaster! lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914060 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914060 ANSWERS lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914061 EXERCISE 1]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914061 EXERCISE 1 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914062 Question 2 - SKETCH]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914062 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914063 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914063 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914064 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914064 EXERCISE 2 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914065 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914065 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914066 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914066 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914067 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914067 EXERCISE 3 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914068 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914068 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914069 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914069 EXERCISE 4 - ANSWERS lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914071 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914071 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914072 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914072 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914073 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914073 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914074 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914074 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914075 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914075 ROLLER COASTER WORKSHEET lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914076 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914076 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914077 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914077 Roller Coaster Physics lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914078 Energy transformations in a coaster ride:]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914078 ROLLER COASTER PROBLEM 1 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914079 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914079 Wooden roller coasters: Shiver me timbers lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914080 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914080 ROLLER COASTER PROBLEM 2 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914081 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914081 ROLLER COASTER LAB lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914082 Purpose:  
    Your goal is to design and build the wildest roller coaster ride that will deliver a marble safely to the end. You must at least demonstrate three successful consecutive runs.
     
    Criteria:  Your roller coaster should have at least:
    ·         2 hills,  2 turns and 1 vertical loop (extra credit for extra loops, hills or turns)
    Materials:  
    ·         2 lengths of insulation tubing & marble
    ·         Scissors & toothpicks 
    ·         Support material like wooden sticks or paper cups
    ·         Stop watch (phone timer) & meter rule 
     
    Procedure:  
    1. Design a roller coaster and submit your design for approval before construction. 
    2. You need to do Potential energy and Kinetic energy calculations. 
    3. For this you need to measure the height of the roller coaster from where the marble starts to the base where the marble ends its trip. 
    4. You need to calculate the velocity of the marble as it finally rolls off into a cup.
    5. The entire group must make the demonstration in front of the class and speak on their project for 3 minutes (about the history and physics of roller coasters, and a video your team’s experience in building it.) 
    6. Class will vote for best themed & decorated roller coaster (2-point bonus).
     
    Calculations:
    • Mass of marble (kg) = m =
    • Track Height (m) = h = 
    • Distance traveled horizontal (m) = dx =
    • Time t (s) = 
    • Actual final velocity  (m.s-1) of marble  v = dx / t =
    •  Ep  (J) = mgh = 
    • Ek  (J)  = ½mv2 = 
    • E Lost (Ep – Ek) = 
    • Theoretical final velocity of marble   v = √(2gh)  =     

    Conclusion:
     
    1. When was the first roller coaster made?
    2. Which is the world’s highest coaster?
    3. What do you think happened to the energy lost during the marble ride?
    4. What laws are being demonstrated during the marble ride?
     
    Roller Coaster Project Rubric:
     | Looking For… | 
    • Way 
    • Part Way 
    • No Way 
    Scoring

     | Presentation | 
    • Well presented, covers the history, physics and team experience. 
    • Reading from paper, some parts missing, lacking seriousness.
    • Missing major parts of presentation or making a joke of presentation. 
    Physics,History                                                                                                                   /2
    Formal presentation                                                                                                          /3

    | Roller Coaster | 
    • Has all the appropriate number of hills, loops and/or turns. 
    • 3 successful trials in a row | Missing some of the requisite features. 
    • 2 successful trials in a row | Missing loop. Trials mostly unsuccessful.  
    Features                                                                                                                               /3

     | Workmanship & Theme | 
    • Neat finish and well decorated. Has a well defined theme. 
    • Wobbly. Theme is not apparent/ is silly/ is unappealing 
    • No theme, Structure completely unstable 
    Workmanship                                                                                                                     /1 Theme                                                                                                                                  /1

    | Calculations | 
    • All calculations done correctly.  
    • Some calculations done wrong. 
    • Large errors in calculations. 
    Calculations                                                                                                                       /5

    | Conclusions | 
    • All questions answered fully and correctly. 
    • Some questions answered correctly or partial answers. 
    • Answers wrong or show lack of understanding.
    Conclusions                                                                                                                        /2

    | Teamwork |  
    • Team has worked well together to produce an effective and strong product, with equal distribution of tasks. 
    • Some team members worked harder than others in completing the project.  
    • Most of the work has been done by one or two people. 
    Effective Teamwork                                                                                                           /3
                                                                                                                                    TOTAL 20
    ]]>     2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914082     HOMEWORK: lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914083 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914083 EXERCISE 5 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914084 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914084 TYPICAL EXAM QUESTION lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914085 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914085 ANSWERS lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914086 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914086 TYPICAL EXAM QUESTION lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914087 Mechanical Energy = Ep  +  Ek   (in a closed system)]]> 2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914087 EXAM QUESTION continued... lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914088
    Mr Lambson is travelling down a hill in his Lamborghini when he suddenly runs out of fuel at point A. In the distance, over the next hill at B, Mr Lambson spots a fuel station at D. Use the ground as a reference point. Mr Lambson’s Lamborghini has a mass of 1600 kg, this includes the mass of Mr Lambson. Use the information and diagram above to answer the following questions. Ignore all friction. 

    1    State the Law of Conservation of Energy.                      (2)

    2    State the Principle of Conservation of Mechanical 
           Energy    .                                                                                (2)

    3    Calculate the total mechanical energy which Mr Lambson’s Lamborghini possesses at A, assuming he was rolling down the hill at 4 m.s-1 when he ran out of fuel.          (3)

    4    Calculate the potential energy of Mr Lambson’s
          Lamborghini at B.                                                                (2)

    5    Calculate the speed with which he will arrive at the fuel
          station at D.                                                                             (4)
    ]]>     2020-12-27 11:34:37 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/1042914088     NOTES 2025 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262245891 2022-08-16 13:36:45 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262245891 GRAVITATIONAL FORCE lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262254479 2022-08-16 13:44:16 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262254479 INTRO TO MECHANICAL ENERGY: Ep and Ek lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262273333 2022-08-16 14:04:17 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262273333 POTENTIAL ENERGY lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262275330 2022-08-16 14:06:31 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262275330 KINETIC ENERGY - WORKED EXAMPLE lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262286600 2022-08-16 14:15:52 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262286600 POTENTIAL ENERGY EXAMPLES lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262294917 2022-08-16 14:22:45 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262294917 GRAVITATIONAL FORCE lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262309002 Acceleration due to gravity = g = 9,8 m/s2

    Fg = m x g
    F    g = Weight

    Example:
    Calculate the gravitational force on an object with mass 55 kg on the surface of earth.

    F    g = m x g
         = 55 (9,8)
         = 539 N down    ]]>     2022-08-16 14:36:41 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262309002     PROBLEMS - MECHANICAL ENERGY lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262313497 2022-08-16 14:40:49 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262313497 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262315142 2022-08-16 14:42:36 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262315142 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262318758 2022-08-16 14:46:17 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262318758 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262319956 2022-08-16 14:47:19 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262319956 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262321459 2022-08-16 14:48:44 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262321459 MECHANICAL ENERGY IS THE SUM OF POTENTIAL AND KINETIC (E mech = Ek + Ep) lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262332964 2022-08-16 14:59:51 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2262332964 Watch this video on conservation of mechanical energy lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2264020334 2022-08-18 04:31:49 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2264020334 Principle of conservation of mechanical energy: Design your own skate park lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2264024688 2022-08-18 04:38:41 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2264024688 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2273936690 2022-08-28 20:25:41 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2273936690 lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2664317791 2023-08-17 06:25:18 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2664317791 Why do the bounces increase in height? lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2664400415 2023-08-17 07:19:07 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2664400415 ROLLER COASTER LAB lizellexs https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2674803400 2023-08-28 06:48:49 UTC https://padlet.com/lizellexs/5urg1rtguuqa58i3/wish/2674803400