# Thread: physics, force stuff

1. ## physics, force stuff

Mass m1=25.7 kg is on a horizontal surface, connected to mass m2= 5.10 kg by a light string as shown. The pulley has negligible mass and no friction. A force of 222.5 N acts on m1 at an angle of 30.9o.The coefficient of kinetic friction between m1 and the surface is 0.233. Determine the upward acceleration of m2. 2. Originally Posted by sarabolha Mass m1=25.7 kg is on a horizontal surface, connected to mass m2= 5.10 kg by a light string as shown. The pulley has negligible mass and no friction. A force of 222.5 N acts on m1 at an angle of 30.9o.The coefficient of kinetic friction between m1 and the surface is 0.233. Determine the upward acceleration of m2. As shown >> where is it ?

3. its just making a referece to the picture, the light string is what is connecting the two masses...

4. I'm guessing $\displaystyle m_2$ is a hanging mass.

let T = magnitude of the tension in the string between $\displaystyle m_1$ and $\displaystyle m_2$.

F = magnitude of the applied force on $\displaystyle m_1$

N = magnitude of the normal force on $\displaystyle m_1$ by the horizontal surface

net force on $\displaystyle m_2$ ...

$\displaystyle T - m_2g = m_2a$

net force on $\displaystyle m_1$ ...

$\displaystyle F\cos(30.9) - \mu N - T = m_1a$

where ...

$\displaystyle N = m_1g - F\sin(30.9)$

$\displaystyle m_1$ and $\displaystyle m_2$ will experience the same magnitude of acceleration ... solve the system of equations for "a".

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