Two-blocks-are-moving-together-under-the-action-of-a-constant-horizontal-external-force-F-If-the-smaller-block-is-at-rest-with-respect-to-the-bigger-block-due-to-the-friction-between-them-then-the-n

Question Number 24371 by Tinkutara last updated on 16/Nov/17

$$\mathrm{Two}\:\mathrm{blocks}\:\mathrm{are}\:\mathrm{moving}\:\mathrm{together}\:\mathrm{under} \\ $$$$\mathrm{the}\:\mathrm{action}\:\mathrm{of}\:\mathrm{a}\:\mathrm{constant}\:\mathrm{horizontal} \\ $$$$\mathrm{external}\:\mathrm{force}\:{F}.\:\mathrm{If}\:\mathrm{the}\:\mathrm{smaller}\:\mathrm{block}\:\mathrm{is} \\ $$$$\mathrm{at}\:\mathrm{rest}\:\mathrm{with}\:\mathrm{respect}\:\mathrm{to}\:\mathrm{the}\:\mathrm{bigger}\:\mathrm{block} \\ $$$$\mathrm{due}\:\mathrm{to}\:\mathrm{the}\:\mathrm{friction}\:\mathrm{between}\:\mathrm{them},\:\mathrm{then} \\ $$$$\mathrm{the}\:\mathrm{normal}\:\mathrm{reaction}\:\mathrm{between}\:\mathrm{the}\:\mathrm{bigger} \\ $$$$\mathrm{block}\:\mathrm{and}\:\mathrm{floor}\:\mathrm{is} \\ $$

Commented by Tinkutara last updated on 17/Nov/17

$$\mathrm{Thank}\:\mathrm{you}\:\mathrm{very}\:\mathrm{much}\:\mathrm{Sir}! \\ $$

Commented by Tinkutara last updated on 16/Nov/17

Commented by ajfour last updated on 16/Nov/17

Commented by ajfour last updated on 16/Nov/17

$${from}\:{balance}\:{of}\:{smaller}\:{block} \\ $$$${along}\:{vertical}: \\ $$$$\:\:{f}={mg} \\ $$$${from}\:{balance}\:{of}\:{bigger}\:{block} \\ $$$${along}\:{vertical}: \\ $$$$\:\:{R}\:=\:{mg}+{f} \\ $$$${Hence}\:\:{R}\:=\:\mathrm{2}{mg}\:. \\ $$

Commented by mrW1 last updated on 17/Nov/17

$${You}\:{are}\:{right}\:{sir}! \\ $$

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