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A first class lever is when the fulcrum is in-between the load and the force.
some examples of first class levers are a sea-saw, scissors and pliers. First class levers are used in everyday life to help make things easier, for example lifting heavy things or cutting though objects.
What is some more examples first class levers?

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A second class lever is when the load (resistance) is in-between the force (effort) and the fulcrum (axis).
some examples are a wheelbarrow and a bottle opener.
What is some more examples of second class levers?

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Third class levers is when the force (effort) is between the fulcrum (axis) and the load (resistance). an examples of third class levers is tongs and a fishing rod.
What is some more examples of third class levers?

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Here are some more videos to help explain the concepts of levers 

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Here are some more videos to help explain the concepts of levers 

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Three Classes of Levers - Examples, Defintion, Classification

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Your body is made up of mostly third class levers. However there are a few examples of first and second class levers within the human body.
Can you name a first, second and third class lever with in the body and state what is the fulcrum, load and force?

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Muscles and bones work together and they are called levers. A lever is a long rod (bone) which moves about the pivot (joint). Levers are used when a small force needs to lift a heavy force.
What are some more examples of levers in the human body?

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Joints and levers in the human body || 3D Animation||Education Biology