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  • Forces and loads
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      Forces and loads
      Structures
      Without background sound
      Logo

       

      2. Forces and loads

      /useruploads/ctx/a/35147309/r/s/8330769/AU-0S1TE1-05-007.mp3?idcurso=642469Talking book

      Physical bodies and objects need a structure to support the different forces that act on them, like gravity which attracts objects to Earth and causes them to have weight.

      A force is anything that can deform a body (static effect) or make it move or stop (dynamic effect).

       











      image
      To define a force, we have to specify its intensity, direction and the point of application
      image

      There are two main types of loads:

      • Fixed or permanent loads are constant – they don't vary over time. An example would be the weight of the structure of a bridge and its component parts (columns, road surface, etc.).
      • Variable loads vary over time, like the traffic going across a bridge or the wind hitting it.
       
      • A force can deform a body, make it move or stop it.
      • A structure bears the effects of the forces acting on it.
      • A force that acts on a body is called a load.
      A load is a force that acts on a structure. It can be fixed or variable.

       

      Loads produce stress on the structure of a body. The same load can cause different effects depending on the shape of the structure, the point of application, the direction, and the trajectory.

       
      Forces and loads
      Structures
      Without background sound
      Logo

      Activity 6

      Say if the force doing the following actions produces a static or dynamic effect:

      Static effect

      Static effect

      Dynamic effect

      Dynamic effect

        /*%%SmartyNocache:642621626696ddf069470a2_32631632%%*/smarty->registered_plugins[Smarty::PLUGIN_FUNCTION]['textweb'][0], array( array('name'=>"slide_classify_initial_group",'value'=>"Ninguno",'value_en'=>"Reset"),$_smarty_tpl ) );?> /*/%%SmartyNocache:642621626696ddf069470a2_32631632%%*/ Static effect Dynamic effect

      Done
      Forces and loads
      Structures
      Without background sound
      Logo

      Activity 7

      Responde a las siguientes preguntas: (500 palabras máximo cada pregunta)
      Indicate the forces of the actions in activity 6.
      Types of forces Direction Point of application Trajectory Intensity
      Hitting a golf ball
      Sitting down on a sofa
      Pushing a shopping trolley
      Your heart pumping blood
      Squeezing a piece of plasticine
      Giving your friend a hug
       

      Done
      Forces and loads
      Structures
      Without background sound
      Logo

      Activity 8

      /useruploads/ctx/a/35147309/r/s/8330799/AU-0S1TE1-05-008.mp3?idcurso=642469Listen and say which concept is defined.
      • a) Anything that can deform a structure

      • b) A set of elements in a body

      • c) A force that act on a structure

      • structure

      • load

      • force

      Done

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