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Physics



 
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Bushviper



Joined: 07 Aug 2006
Posts: 281

PostPosted: Tue Feb 17, 2009 3:03 pm    Post subject: Physics Reply with quote

Hey I know this isn't the type of thing you expect to see on the M-L forums but I need some help with 2 problems of my physics homework. There has to be someone on M-L that knows how to solve these.

Blocks with masses of 1.0 Kg, 2.0 Kg, and 3.0 Kg are lined up in a row on a frictionless table. All three are pushed forward by a 12 N force applied to the 1.0 Kg block. How much force does the 2.0 Kg block exert on:

A) The 3.0 Kg block
B) The 1.0 Kg block

A 2.0 m long, 500 Kg rope pulls a 10 Kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.0 m/s2. How much force pulls forward on:

A) The block of ice
B) The rope

Any help would be appreciated. Thanks.
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Badden



Joined: 08 Feb 2009
Posts: 5

PostPosted: Tue Feb 17, 2009 3:14 pm    Post subject: Reply with quote

force = mass times acceleration

newton's 2nd law
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Bushviper



Joined: 07 Aug 2006
Posts: 281

PostPosted: Tue Feb 17, 2009 3:38 pm    Post subject: Reply with quote

I know that but how would you apply it to either problem or at least how would you set it up?
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Badden



Joined: 08 Feb 2009
Posts: 5

PostPosted: Tue Feb 17, 2009 4:21 pm    Post subject: Reply with quote

Bushviper wrote:
I know that but how would you apply it to either problem or at least how would you set it up?


Hint: treat the 3 blocks as a system to determine acceleration.

Hint 2: A math forum might have better answers than a gaming one :p
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Sprouts



Joined: 15 Feb 2006
Posts: 101

PostPosted: Tue Feb 17, 2009 7:08 pm    Post subject: Reply with quote

this is so easy...
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ik
Level 1 Judge


Joined: 11 Sep 2007
Posts: 335

PostPosted: Tue Feb 17, 2009 7:15 pm    Post subject: Reply with quote

No using ML for help on your science homework ^^
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CoLd



Joined: 11 Feb 2009
Posts: 7

PostPosted: Tue Feb 17, 2009 9:36 pm    Post subject: Reply with quote

losers...
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Rosie



Joined: 29 Feb 2008
Posts: 14

PostPosted: Wed Feb 18, 2009 1:01 am    Post subject: Re: Physics Reply with quote

Bushviper wrote:

Blocks with masses of 1.0 Kg, 2.0 Kg, and 3.0 Kg are lined up in a row on a frictionless table. All three are pushed forward by a 12 N force applied to the 1.0 Kg block. How much force does the 2.0 Kg block exert on:

A) The 3.0 Kg block
B) The 1.0 Kg block


You can figure out acceleration by treaint all of them as a single block.
so you get 6kg.

F=ma
12=6 (2m/s^2).

so 2 is your a.

Ok so draw out your force diagrams.

All three should have gravity and normal forces. so im not gunna list those. From this you can figure out trivial answers.


MA <--(1.0)---> 12 N

Ok so we know the force that block 2 exerts on block 1 is 4N. (2*2).

Ill let you do the rest of the work to figure out why the 2kg block exerts 4N on the 3kg block.



Quote:
A 2.0 m long, 500 Kg rope pulls a 10 Kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.0 m/s2. How much force pulls forward on:

A) The block of ice
B) The rope


Again. THe best way to tackle this problems is with force (or free body) diagrams. Again, force due to gravity and normal force apply. but since we arent moving vertically im not gunna bother with them.

(ice)---> F(rope on ice))
F(ice on rope) <---(Rope)

A) this should be easy. F=ma. F= (10)(2) = 20N
B) Well Newtons third law states that this should also be 20 N.
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