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  1. #1
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    Physics problem involving force

    I attached some pictures I quickly made in order to aid my explanation.

    What is the acceleration of the system if someone acts upon the system where the blue arrow is? What about the tensional force between the 3 blocks?
    physicssystem1.jpg

    How can I calculate the compressional force if someone acts on the system where the blue arrow is? What about the tensional force?
    physicssystem2.jpg

    Thanks in advance!
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  2. #2
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    Quote Originally Posted by colerelm1 View Post
    I attached some pictures I quickly made in order to aid my explanation.

    What is the acceleration of the system if someone acts upon the system where the blue arrow is? What about the tensional force between the 3 blocks?
    physicssystem1.jpg
    assuming no friction ...

    \displaystyle a = \frac{F}{m_1+m_2+m_3}

    each block will have the same acceleration.

    set up a force equation for each block individually. for example ...

    tension, T_1 , in the last string is the net force on m_1 ...

    \displaystyle T_1 = m_1 a = m_1 \cdot \frac{F}{m_1+m_2+m_3}

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    same drill for the second problem ... acceleration of all three blocks will be

    \displaystyle a = \frac{F}{m_1 + m_2 + m_3}

    find the net force on each individual block and use Newton's 2nd law to determine the contact force and tension.

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    Quote Originally Posted by skeeter View Post
    assuming no friction ...

    \displaystyle a = \frac{F}{m_1+m_2+m_3}

    each block will have the same acceleration.
    What if I wanted to find the acceleration for each individual block?
    set up a force equation for each block individually. for example ...

    tension, T_1 , in the last string is the net force on m_1 ...

    \displaystyle T_1 = m_1 a = m_1 \cdot \frac{F}{m_1+m_2+m_3} Does this tension equation refer to the far left string when you say "in the last string"?

    What if I wanted to find the acceleration of each block separately in the 2nd problem too?
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  5. #5
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    Quote Originally Posted by colerelm1 View Post
    What if I wanted to find the acceleration of each block separately in the 2nd problem too?
    set up a force diagram for each individual block then use Newton's 2nd law to set up a system of three equations ... solve for each force.
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