Question

A block of mass M is pulled along a frictionless surface by a rope of mass m.If a force P is applied at the free end of rope ,What will be the force exerted by the rope on the block???

Answer 1

As the rope pulls the block, the block pulls back with equal force in the opposite direction. So I'll go with 2p. But I'm not sure of that.. Anyone?

Answer 2

wait that's not right...

Answer 3

F=ma

Answer 4

see just take mass of rope plus the block and then apply all formulas

Answer 5

like joint bodies

Answer 6

they have reaction forces between them

Answer 7

(M+m)a = p

Answer 8

?

Answer 9

| r | <-------rope
--------
| r | < --------block so r is the force exerted by the rope on the block


r = m(block)a and from the rope equation

Answer 10

f (force applied ) + r = m(rope)a

now get r

Answer 11

Maybe I should thing twice about taking physics. lol

Answer 12

lol

no you should take it

Answer 13

I don't really understand why its F+r on the left side there..

Answer 14

the thing is
block
| rope
|----------------------
R<-| ---------> R
|----------------------
|
--------------------------------------------------

Answer 15

R is the reaction force or contact force

Answer 16

------------------------------------
---->R |--------->p
------------------------------------

P + r = m(rope)a

Answer 17

Are we speaking of the force the rope is "feeling"?

Answer 18

Yeah

Answer 19

OHHHHH

Answer 20

I didn't draw the normal or perpendicular forces

Answer 21

but it says "what will be the force by the rope ON THE BLOCK.. lol so I thought that means, what the block is feeling>>

Answer 22

R is the force for the block from the rope

Answer 23

now take a careful look the only force that rope and block have is the R so hence r is the one were looking for

Answer 24

Is there a name for this type of problem so I can go concentrate on them?

Answer 25

try Rop-mass.......... I don't know i didn't solve them much