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## Homework Statement

Two blocks connected by a string are pulled across a horizontal frictionless surface by a horizontal force of magnitude F=14.0 N. What is the tension (T) in the connecting string?

so you have block 1 (mass of 2kg) then the string then block 2 (mass of 5kg) then the force pulling it of 14 N

[1]---T---[2]---->F

## Homework Equations

f=ma

t=ma

## The Attempt at a Solution

so i found the acceleration:

a = f/m

a = 14/(5+2) = 2 m/s

^{2}

then i found the tension:

t = ma

t = 2kg(2m/s

^{2)}

t = 4 N

What i am wondering is why do you multiply the

**2kg block**by the acceleration to get the tension and not multiply the 5kg block or the total of 7kg by the acceleration to get the tension?

can anyone explain please? i have a physics exam tomorrow and i am studying and really trying to understand tension :)

thank you