examples of levers in the human body

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Question:I already know of a few examples (the jaw when chewing a very sticky food like caramel, breathing out forcibly, and some people believe standing on your toes is an example as well) but I need just one more example. I may have found another (the subluxation of the C1 vertebra) but I don't know what would be the input and output forces (the fulcrum is obviously the joint between the atlas and axis). If you find another example please tell me the fulcrum, input force, and output force. Thanks!

Answers:I can't find anymore,second class levers are rare in the human body.Good luck in finding another one!


Answers:i will give the answers tomorrow if you don't find them sorry i left my kinesiology book at school and I want to make sure before I give you the answer. sorry 1st class: The head sitting on the cervical spine. Where the head sits is the axis, the weight of the head on one side is the resistance, and the muscles pulling down on the other side of the head would be the force. 2nd class: There is an example at your foot when you stand on the tip of your toes. The axis would be at your toes, the resistance would be your leg bones (tibia), and the rest of your body and the force would be your calf muscles. 3rd class: This is the most common lever in your body by far. An example would be your arm. The axis would be your elbow, the resistance is you forearm and hand, and the force would be your biceps. Think about arm curls. Sorry it took so long for me to answer I have been busy.

Question:I need to come up with one for school but my mind is totally blank. It needs to be something that I could find easily in my home or community. Please exclude: WHEELBARROW, PLIERS, CLAW END OF A HAMMER. I have to calculate the mechanical advantage which is easier than coming up with an example!

Answers:First-class lever examples: Seesaw (also known as a teeter-totter) Crowbar or claw hammer (removing nails) Spud bar (moving heavy objects) Pliers (double lever) Scissors (double lever) Wheel and axle because the wheel's motions follows the fulcrum, load arm, and effort arm principle Trebuchet an upside down example of the above picture Oars, when used for rowing, steering, or sculling Can opener and bottle opener Bicycle hand brakes Hand trucks are L-shaped but works on the same principle on the wheel as a fulcrum Hammer when pulling a nail with the hammer's claw Tweezers that are shaped like scissors work as double levers Shoehorn Second class lever examples: Wheelbarrow Nutcracker Door Crowbar Stapler Diving board Wrench Dental Elevator Can Opener Third class lever examples: Human arm Tweezers Slings, trebuchets, and fishing rods (also spoons, when used for flinging food. This uses your index finger as the fulcrum, your thumb as the effort, and the load is the food.) Any number of tools, such as a hoe or scythe The main body of a pair of nail clippers, in which the handle exerts the incoming force baseball bat shovel broom staple remover golf club hockey stick The Human Mandible See http://en.wikipedia.org/wiki/Lever for info on each class.

Question:What are the 3 types of levers that you learn about in science class? I also need an example of each that are in your body.

Answers:First, second, and third class levers. An example of a first-class lever is the joint between the skull and the atlas vertebrae of the spine: the spine is the fulcrum across which muscles lift the head. An example in the human body of a second-class lever is the Achilles tendon, pushing or pulling across the heel of the foot. An example of a third-class lever in the human body is the elbow joint: when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.