Why Does the Upper Block Fall When Force is Applied Below?

[Shardul Khare]

When a keep two blocks one over another...And apply a foce on the block which is below...Why does the upper block falls down..Why dosent it move with A? assumin there's no friction between A and B?

 

[phinds]

When a keep two blocks one over another...And apply a foce on the block which is below...Why does the upper block falls down..Why dosent it move with A? assumin there's no friction between A and B?

Why do you think? Which of Newton's Laws might apply to this situation?

 

[Shardul Khare]

Why do you think? Which of Newton's Laws might apply to this situation?

No idea

 

[phinds]

Well, look at it this way. You are surprised that the upper block falls down when the lower block moves out from under it. Ask yourself why SHOULD the upper block move with the lower block?

 

[ZapperZ]

No idea

Aren't you being a bit lazy here?

Try this. How about you write down, in this thread, all 3 of Newton's Laws? You may copy that from your text, but better yet, state them in your own words to see if you actually not just read them, but comprehend what they say. Then we can jump off from there.

Zz.

 

[Shardul Khare]

First Law states that A body continues to be in motion or at rest until an unbalanced force is acted on it
Second law-sEOCND LAW - f=MA
Third Law: Every action has an equal and opposite reaction

 

[ZapperZ]

First Law states that A body continues to be in motion or at rest until an unbalanced force is acted on it
Second law-sEOCND LAW - f=MA
Third Law: Every action has an equal and opposite reaction

Now, look at your question, and then look at the First Law. In particular, if there's no friction between A and B, how would the First Law be relevant here?

Zz.

 

[Shardul Khare]

The Normal and Mg cancel out,no friction means no other force acting on B,right?

 

[Shardul Khare]

Now, look at your question, and then look at the First Law. In particular, if there's no friction between A and B, how would the First Law be relevant here?

Zz.

 

[phinds]

The Normal and Mg cancel out,no friction means no other force acting on B,right?

RIght. And what happens to a body with no force acting on it?

 

[Shardul Khare]

It remains unaccelerated, So when we apply force on the lower bloack,the upper block will stay where it is and the lower block will mover forward, am i right?

 

[phinds]

It remains unaccelerated, So when we apply force on the lower bloack,the upper block will stay where it is and the lower block will mover forward, am i right?

yes, that's where I was leading you in post #4

 

[Shardul Khare]

yes, that's where I was leading you in post #4

Thank you :)