For example, head extension is a good example of a first-class lever system. Here, neck and back muscles apply an force to move the head. The weight of the head it the load, and the fulcrum is the joint between the skull and the vertebrae.n a second-class lever, the load is located between the force and the fulcrum. A wheel barrow is great example of a second-class lever system. Here, the wheel is the fulcrum, or the pivot point, the weight is the load and lifting the handles applies the force to move the load.
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Just the basic facts. An Amazon Prime membership will set you back $79 per year. You can start with a one-month free trial, or if you're a student or a parent, the Amazon Student and Amazon Mom programs offer other benefits. (We'll get to those in a little bit.).One membership can be shared with up to four additional people, so you and your family can all receive the membership for one yearly fee.et your stuff fast for less. Super Saver Shipping is great, but there's a $25 minimum order to qualify and it can still take five to eight days to get your stuff. The biggest benefit of Amazon Prime membership is free two-day shipping on most orders, which can pay for your $79 yearly fee after only a handful of orders.