Сила. Виды сил.

object(ArrayObject)#869 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(79) "Конспект урока  "Сила упругости.Закон Гука" "
    ["seo_title"] => string(42) "konspiekt-uroka-sila-uprughosti-zakon-guka"
    ["file_id"] => string(6) "103836"
    ["category_seo"] => string(6) "fizika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1402640507"
  }
}

object(ArrayObject)#891 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(42) "урок на тему: "Виды сил" "
    ["seo_title"] => string(22) "urok-na-tiemu-vidy-sil"
    ["file_id"] => string(6) "100999"
    ["category_seo"] => string(6) "fizika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1402402680"
  }
}

object(ArrayObject)#869 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(53) "Система уроков по теме "Силы" "
    ["seo_title"] => string(30) "sistiema-urokov-po-tiemie-sily"
    ["file_id"] => string(6) "102183"
    ["category_seo"] => string(6) "fizika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1402485357"
  }
}

object(ArrayObject)#891 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(52) "Конспект урока "Сила трения" "
    ["seo_title"] => string(29) "konspiekt-uroka-sila-trieniia"
    ["file_id"] => string(6) "150855"
    ["category_seo"] => string(6) "fizika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1420562387"
  }
}

object(ArrayObject)#869 (1) {
  ["storage":"ArrayObject":private] => array(6) {
    ["title"] => string(69) "Тема: Сила трения. Коэффициент трения "
    ["seo_title"] => string(42) "tiema-sila-trieniia-koeffitsiient-trieniia"
    ["file_id"] => string(6) "155413"
    ["category_seo"] => string(6) "fizika"
    ["subcategory_seo"] => string(5) "uroki"
    ["date"] => string(10) "1421264412"
  }
}