Which class of a lever is always a force multiplier? Give example.
Class II; Crow bar
Class I; Crow bar
Class II; Wheel barrow
Class III; Crow bar
Class III; Wheel barrow
Classify the following into levers as class I, class II or Class III :
(a) a door (b) a catapult
(c) a wheel barrow (d) a fishing rod.
Which class of lever can be a force multiplier or a speed multiplier? Give examples.