Tuesday
September 2, 2014

Homework Help: Physics

Posted by Physics on Sunday, July 12, 2009 at 4:24pm.

I got two questions

Three blocks on a fricitonless horizontal surface are in contact with each other

a force F is applied to block 1 mass m1

Draw a free body diagram for each block
ok done

the accelration of the system (in terms of m1, m2, and m3)
ok done I got
a = (m1 + m2 + m3)^-1 (force F)

the force of contact that each block exerts on its neighbor
ok no idea how to do this

----->Force F | m1 |--->contact force | m2 |---->contact force | m3 |

ok so how do i do this
ok and

a block (mass m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to a second block (m2), which hangs vertically.

Draw a free body diagram for each block showing the force of gravity on each, the force (tension) exerted by the cord, and any normal force

ok done

determine formulas for the acceleration of the system and for the tnesion in the cord. Ignore friction and the masses of the pulley and cord

ok well isn't the force of tension just the opposite in direction but equal in magntiude of the force of gravity on second hanging block?

Also isn't the accleeration zero???

Isn't the net force zero???

ok i do not know how to find the acceleration of the system

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