## Hmord 3 years ago Question

1. Hmord

Block A is on top of block B and block B is being pulled with a tension T. There is no friction between A and B nor is there friction between B and the floor. What is the ensuing motion of the blocks when T is applied? |dw:1331273978869:dw|

2. hosein

3. Hmord

When the rope pulls block B, what happens to block A?

4. Hmord

|dw:1331280621464:dw|

5. hosein

\[T=(m _{A}+m _{B})a\]

6. hosein

we take 2body in one mass

7. Hmord

Okay. When we pull B for a while, what happens to A?

8. hosein

hence no friction between them a go back

9. Hmord

So block A doesn't move?

10. hosein

no i mean block A go back notice that we assume no friction between 2masses

11. Hmord

Because there's no friction between blocks A and B, Block A goes back and falls down as we pull block B?

12. hosein

i think yes hence no force check T

13. Hmord

Cool :) Thanks

14. hosein

your welcome friend. for confidece ask another we solve that whit this assumption really no friction on all surfaces

15. hosein

16. heena

asking me ok wait lemme redo this just a sec

17. heena

welll if there is no friction between block A and B then the upper block fall down as due to ma lower block moves noe qn ariseswhen tension applied as by looking this case it seems like freely falling body because tension is applied but in which respect as no friction b/w block and floor if u applied a lil force or u dont it ll move due to its weight