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Љиљана Вићовац
Кретање
 Да бисмо уочили кретање, треба да посматрамо међусобни
положај тела око себе.
 Ако неко тело мења свој положај у односу на друго тело, у својој
околини , то значи да се тело креће.
 Кретање је промена положаја тела у односу на друго тело
 Шта се на сликама креће, а шта мирује?
Воз се креће у односу на пругу
Авион се креће у односу на земљу
Аутомобил се креће у односу на пут.
 Стварна или замишљена линија по којој се тело креће
назива се путања тела .
 Какве путање остављају тела која се крећу?
Према путањи тела, кретање може да
буде
праволинијско
__________________________
криволинијско
кружно
Када се љуљамо на љуљашци наше тело се креће
напред назад.
Како се покреће наше тело када се клацкамо на
клацкалици?
Кретање када се тело враћа у претходни положај
називамо периодично кретање.
Кретање
Кретање
 Да би се тело које мирује покренуло, потребно
је сила.
 Сила проузрокује кретање тела.
 Силе гурају, вуку и обрћу тела да би она ишла
брже или спорије, мењали правац и облик
кретања.
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Кретање

  • 3.  Да бисмо уочили кретање, треба да посматрамо међусобни положај тела око себе.  Ако неко тело мења свој положај у односу на друго тело, у својој околини , то значи да се тело креће.  Кретање је промена положаја тела у односу на друго тело  Шта се на сликама креће, а шта мирује? Воз се креће у односу на пругу Авион се креће у односу на земљу Аутомобил се креће у односу на пут.
  • 4.  Стварна или замишљена линија по којој се тело креће назива се путања тела .  Какве путање остављају тела која се крећу?
  • 5. Према путањи тела, кретање може да буде праволинијско __________________________ криволинијско кружно
  • 6. Када се љуљамо на љуљашци наше тело се креће напред назад. Како се покреће наше тело када се клацкамо на клацкалици? Кретање када се тело враћа у претходни положај називамо периодично кретање.
  • 9.  Да би се тело које мирује покренуло, потребно је сила.  Сила проузрокује кретање тела.  Силе гурају, вуку и обрћу тела да би она ишла брже или спорије, мењали правац и облик кретања.