The discussion centers on the question of why a block accelerates even when the forces acting on it appear to be equal. Participants explore concepts related to force transmission between connected blocks, the role of friction, and the application of Newton's laws of motion.
Participants express differing views on the nature of force transmission and the effects of friction, indicating that multiple competing perspectives remain unresolved.
Participants have not fully clarified the assumptions regarding the forces involved, particularly in the context of friction and the transmission of force through the string.
The force from the string on the block is not necessarily equal to your force on the block.mr newtein said:two blocks are connected by string if i pull a block,then block(it will transmit force) will also pull string then,string will also pull block (a& r pairs)forces on block are by me and by string of equal magnitude than why is block accelerating
jedishrfu said:common layman's usage is:
I apply a force on a block and it moves.
but for physics you need to think this way:
I apply a force (f=ma) on a block of mass m and it accelerates (no friction case).
in the real world with friction:
I apply a force (f=ma) on a block of mass m and it accelerates to some constant
speed because the frictional force increases with increasing speed and opposes the
force I am applying.
nasu said:The force from the string on the block is not necessarily equal to your force on the block.