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Why is pulling the lawn roller preferred...

Why is pulling the lawn roller preferred to pushing it ?

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Let a lawn roller is pulled by means of a force F with some angle `theta` to the horizontal .
By resolving the force into two compoments.
(1) Horizontal component F `costheta` is useful to pull the body .
(2) The vertical component F `sintheta` opposes the weight
So N.R = mg - F `sintheta`
But frictional force `mu` . N.R
`therefore` Frictional force `[mu("mg"-Fsintheta)]` decreases.

So it is easier to pull the body .
When the roller is pushed by a force , the vertical component F `sintheta` causes the apparent increase of weight of the object . So the normal reaction N.R = `mg+Fsintheta` .
`theta` Frictional force `[mu("mg"-Fsintheta)]` increase and it will be difficult to pull the body .
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Knowledge Check

  • (A) : It is easier to pull a lawn roller than to push on the same horizontal rough surface (R ) : Pulling body decreases normal reaction

    A
    Both (A) and (R) are true and (R) is the correct explanation of (A)
    B
    Both (A) and (R) are true and (R) is not the
    C
    (A) is true but ( R) is false
    D
    Both (A) and (R ) are false

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