Question

Explain why, it is easier to pull a lawn mover than to push it.

Answer 1

Make free body diagram

$f=\mu N(N=mg+P\sin \theta )$

$f=\mu (mg+P\sin \theta )$

$=P\cos \theta -\mu mg-\mu P\sin \theta$

$f=\mu N(N=mg-P\sin \theta )$

$f=\mu (mg-P\sin \theta )$

$Fne{t}_2=P\cos \theta -f$

$P\cos \theta -\mu mg+\mu P\sin \theta$

$Fne{t}_2>Fne{t}_1$

So ,it is proved, puIling is easier than pushing