Question Number 21469 by Tinkutara last updated on 24/Sep/17
$$\mathrm{Three}\:\mathrm{identical}\:\mathrm{blocks},\:\mathrm{each}\:\mathrm{having}\:\mathrm{a} \\ $$$$\mathrm{mass}\:{M},\:\mathrm{are}\:\mathrm{pushed}\:\mathrm{by}\:\mathrm{a}\:\mathrm{force}\:{F}\:\mathrm{on}\:\mathrm{a} \\ $$$$\mathrm{frictionless}\:\mathrm{table}.\:\mathrm{What}\:\mathrm{is}\:\mathrm{the}\:\mathrm{net}\:\mathrm{force} \\ $$$$\mathrm{on}\:\mathrm{the}\:\mathrm{block}\:{A}? \\ $$
Commented by Tinkutara last updated on 24/Sep/17
Answered by dioph last updated on 24/Sep/17
$${F}_{{A}} \:=\:{Ma}\:=\:{M}\frac{{F}}{\mathrm{3}{M}}\:=\:\frac{{F}}{\mathrm{3}} \\ $$
Commented by Tinkutara last updated on 25/Sep/17
$$\mathrm{Yes}\:\mathrm{I}\:\mathrm{got}\:\mathrm{the}\:\mathrm{same}\:\mathrm{answer}\:\mathrm{but}\:\mathrm{book} \\ $$$$\mathrm{says}\:{F}.\:\mathrm{Is}\:\mathrm{it}\:\mathrm{wrong}? \\ $$