A mass m

- (passes over a frictionless pulley).

This java applet show the force diagram and the motion of the system when the frictional forces are present.

- The mass of each block is shown at the lower-right corner.

Assume the coefficients of friction between any two surfaces are the same.

Force diagram for mass m

Color of arrow | black | blue | green | cyan | red | yellow |

force | gravity | normal | tension | friction | friction | Net force on m_{2} |

source | earth | table | rope | m_{1} | table |

Click within the white area of each block to change its mass.

- Click right mouse button to increase one mass unit, click left mouse button to decrease one mass unit.

Press

Press

- m
_{1}and m_{2}would not be accelerated? (Net force =0.) - m
_{1}and m_{2 }are accelerated together. - m
_{1}and m_{2 }are accelerated differently. (a_{1}a_{2}which one is larger?)

- The mass of the blocks are m

The normal force between m

- so the frictional force f

The normal force between m

- so the frictional force f

The tension of the rope is T.

For m

For m

- otherwise f

For m

From the above equations, we can find out the accelerations.

I did that calculation already!