Question

In the figure, M2 has more mass than M1 and M1 has more mass than M3. The questions refer to the magnitudes of tensions and weights. There is friction between the horizontal plane and M2 (?k ? 0). M2 is observed to travel at a constant speed. Assume that the pulleys are frictionless and have negligible mass. Select the appropriate statements to complete the following sentences. T1 is ... M1g. The magnitude of the net force on M2 is T2 - T3. T1 is ... T2. M3 accelerates upwards. T2 is ... T3. M3g is ... T4

Answer 1

M? > M? , so if any motion at all (motion could be prevented by the friction between the surface and M?), it will be: M? down, M? to the left, M? up
The system moves at a constant speed, so T? = T? + Friction.
This also means that
T? < T?

As the acceleration of the system is zero:
T? = M?×g
and
T? = M?×g

The pulleys are frictionless and have negligible mass, so:
T? = T?

M? is observed to travel at constant speed, so the other blocks MUST travel at that same constant speed, and there is NO ACCELERATION in the system
(M? accelerates upwards) ---> false

The forces acting on M? are:
* T? pulling to the left
* T? pulling to the right
* Friction opposing the direction of the motion
To find the magnitude of the net force on M?, those 3 forces must be accounted for, so:
(The magnitude of the net force on M? is T? - T?) ---> false
? · 5 years ago