Why is it easy to pull a lawn roller than to push it?



free body diagram of lawn roller
While pulling a lawn roller, the vertical component of the force applied acts in upward direction which decreases the apparent weight of the lawn roller. i.e.
                                     Wapparent = mg-Fv
While pushing the lawn roller, the vertical component of the force applied acts in downward direction eventually increasing the apparent weight of the lawn roller. i.e.
                                      Wapparent = mg+Fv
Hence, it is easier to pull a lawn roller than to push.