Question

A crowbar is of length 3m.
where should the fulcrum be placed along the length of the crowbar so that a boulder of
9 kgwt be lifted with it by applying and effort of 10 N?

Answer 1

Explanation:

Here's the hint for you:-

Given length of the crowbar.=3m.

Find the value of the effort from given data.

Find the value of the load from the given data.(You should convert it into S.I. Units)

Now,

load x load arm=effort x effort arm-----(1)

Substitute the values of load and effort.

Find the ratio of the load arm to effort arm from eq ---(1)

Here,

load arm + effort arm= 3 m.--------(2)

Hope this helps.

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Answer 2

Answer:

fulcrum should be placed at a distance of 0.3m from the boulder

Explanation:

Crow bar is a class 1 lever.

Let the fulcrum be at distance D from the boulder. Thus distance, from effort =(3-D)

Here, F=9 kg wt = 9*10 = 90N Effort,f = 10 N

F*D=f*(3-D)

=> 90D= 10(3-D) => 9D=( 3-D)

=> 10 D= 3

=> D= 0.3 m Thus, fulcrum should be placed at a distance of 0.3m from the boulder.