WEP GR12 by Lizelle Swanepoel https://padlet.com/lizellexs/c6xl1vvlznb8y8of en-us 2021-08-10 21:01:40 UTC 2026-02-04 14:50:04 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Rocket.png lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592239 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592239 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592240 ENERGY = THE ABILITY TO DO WORK
WORK = ENERGY TRANSFERRED]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592240 TYPES OF ENERGY lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592241 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592241 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592242 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592242 WORK lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592243 Product of force parallel to movement and the displacement of a body]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592243 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592245 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592245 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592247 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592247 W = FΔx.cosϴ lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592250
  • When is W positive?
  • When is W negative?
    • ]]>     2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592250     lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592251 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592251 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592252 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592252 POSITIVE VS NEGATIVE WORK lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592253 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592253 Positive vs negative work lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592254 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592254 Work done by forces in different directions lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592255 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592255 Is work done on a tray that is carried by a waiter moving at constant speed? lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592256 NO.
    The force applied on the tray is vertically upwards to overcome the force of gravity on the tray, and there is no part (component) of that force that acts in the same direction as the displacement horizontally. ]]>     2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592256     CONSERVATION OF MECHANICAL ENERGY lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592259 Principle of Conservation of Mechanical Energy states:
    In the absence of external forces, the total mechanical energy in a system is CONSTANT.

    Def for mechanical energy:
    Mechanical energy is the sum of gravitational potential energy and kinetic energy at a point.    ]]>     2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592259     ROLLER COASTER PROBLEM lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592261 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592261 Answers Notes lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592262 Answers p. 13-16]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592262 Work-Energy Theorem = The work done on an object by a net force is equal to the change in the object's kinetic energy lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592263 Wnet = ΔEk]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592263 Work done by forces acting on inclined plane lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592264 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592264 WORK DONE AGAINST FRICTION lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592265 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592265 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592266 Answers p.19-43 NOTES]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592266 Power lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592267 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592267 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592268 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592268 End of chapter ANSWERS NOTES lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592269 Answers Power]]> 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592269 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592270 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592270 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592271 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592271 EXAM QUESTION lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592272 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592272 MEMO - EXAM QUESTION ABOVE lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592273 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592273 EXAM PAPER - 2019 PHYSICS FINALS lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592274 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592274 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592275 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592275 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592276 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592276 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592277 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592277 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592278 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592278 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592279 2021-08-10 21:01:40 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/1674592279 Principle of Conservation of Mechanical Energy = The total mechanical energy (sum of gravitational potential energy and kinetic energy) in an isolated system remains constant. lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031803443 2022-02-06 20:19:59 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031803443 CONSERVATIVE VS NON-CONSERVATIVE FORCES lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031817751 2022-02-06 20:38:22 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031817751 CONSERVATIVE VS NON-CONSERVATIVE FORCES lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031820580 Wnc  = ∆Ek + ∆Ep
     
    Example: 
    A sphere of mass 2 kg is shot vertically upwards from ground level and reaches a maximum height of 4 m above the ground. A constant frictional force of 5,4 N acts on the sphere throughout its motion.
    Calculate the initial velocity of the sphere. 
    ]]>     2022-02-06 20:42:15 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2031820580     ANSWER lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2034994440 Wnc  = ∆Ek + ∆Ep 
     




    Wnc = Ff ∆xcosθ = Ff ∆x cos180 = 5.4 x 4 x (-1) = -21.6 J
     
       ∆Ep =  mghf - mghi = 2*9.8*4 – 0 = 78.4 J
     
       ∆Ek = ½ mvf2 -½ mvi2    = 0 – ½ x 2 x vi2 = - vi2
     
    Wnc  = ∆Ek + ∆Ep 
     
    .: -21.6 = - vi2 + 78.4         .: vi = √(21.6 + 78.4) = 10 m.s-1
    ]]>     2022-02-08 08:59:22 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2034994440     lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464234613 2023-02-01 08:33:56 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464234613 ANSWERS - NOTES 2023 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464235101 2023-02-01 08:34:22 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464235101 Work done by angled forces lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464430281 2023-02-01 11:38:34 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464430281 lizellexs https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464430507 2023-02-01 11:38:48 UTC https://padlet.com/lizellexs/c6xl1vvlznb8y8of/wish/2464430507