PowerPoint Presentation

LOCOMOTION OF A GRASSHOPPER.BY : Mohd Zainul AriffinPutra Syamil

Parts Involved In Locomotion Of Grasshopper.Grasshoppers have 3 pairs of legs

Characteristics of Legs It is long and muscular.Has antagonistic muscles.The flexor and extensor muscles are attached to the interior surface of the exoskeleton.Flexors are muscles that bend a joint while extensors straightens it.WalkingTo walk, a grasshopper uses 2 legs to support its body off the ground while the other 2 legs move together to make successive steps. Heres a example of how grasshopper walks :-D IT DOES NOT USE ITS REAR LEGS!

HOPPING

Knowing the charateristics of rear legs.Extensor muscle and flexor muscle are used to in the mechanism of hopping.How Grass JumpsFlexor Muscle = ContractExtensor Muscle = RelaxLegs Fully Flexed.Legs Forms A Z Shape.Flexor Muscle = RelaxExtensor Muscle = ContractHind legs extends backwards.For propelling in the air.Factors that effect the efficiency of its jumpsThe magnitude of the force.. Low Force = Short distance. High Force = Far distance.Time to build the force.If the thrust builds up too slowly, the legs will extend before the thrust reaches its maximum. Once the grasshopper is standing on tip-toe, it can't thrust against the ground any more.Try this: flex your arm so that your hand is close to your shoulderWhile arm is flexed, place palm ofhand on a wallPush the wall with your hand, extending your armFeel the push backwards? That show a grasshopper jumps.Simple ExampleShort Video

FIN = END = HABIS

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