Physics
Draw diagrams to illustrate the positions of fulcrum, load and effort, in each of the following :
(a) a see-saw
(b) a beam balance
(c) a nut cracker
(d) a pair of forceps
Machines
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Answer
(a) See-saw is an example of class I lever in which the fulcrum is in between the load and the effort so that the effort arm is equal to the load arm.
(b) Beam balance is a type of class I lever in which the fulcrum is in between the load and the effort so that the effort arm is equal to the load arm.
(c) Nut cracker is an example of class II lever in which the fulcrum is at one end and the load is closer to the fulcrum. Thus, the effort arm is always longer than the load arm.
(d) Pair of forceps is a type of class III lever in which the effort is in between the fulcrum and the load so that the fulcrum is at one end and the effort is close to the fulcrum, thus the effort arm is always shorter than the load arm.
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