Physics

posted by .

Two masses are held while suspended on a frictionless pulley.Their masses are 0.250 kg and 0.200 kg.
a. Compute for the acceleration of the masses once they are released?
b.Find the tension on the string

m1 accelerates upward and m2 downward


Let a be the acceleration of m1 upward and m2 downward. m2 > m1
Let T be the tension in the string connecting them. With a frictionless (and massless) pulley, the same tension force T acts upon both masses.
The equations of motion are
m2 g - T = m2 a
T - m1 g = m1 a

These two equations can be solved easily for the unknowns T and a. See what you get when you add them:
(m2 - m1) g = (m2 + m1) a
Solve that for a, and then substitute that "a" into either of the first two equations, and solve for T.


Assuming the pulleys are massless, then the force (conterclockwise positive)

Net force= m2*g -m1*g

Net force= total mass * acceleration
you know the total mass as the sum of the masses.

Tension? Consider the force pulling m1 upward:T= m1*g + m1*acceleration.

  • Physics -

    bcv

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics-Mechanics

    A pulley is massless and frictionless. 3 kg, 2 kg (on the left), and 6 kg (on the right) masses are suspended What is the tension T1 in the string be- tween the two blocks on the left-hand side of the pulley?
  2. Physics

    Two masses are suspended from a pulley as shown in the figure . The pulley itself has a mass of 0.30 kg, a radius of 0.20 m, and a constant torque of 0.30 m \cdot N due to the friction between the rotating pulley and its axle. What …
  3. Physics

    Two masses are suspended from a pulley as shown in the figure . The pulley itself has a mass of 0.30 kg, a radius of 0.20 m, and a constant torque of 0.30 m \cdot N due to the friction between the rotating pulley and its axle. What …
  4. physics

    Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley …
  5. physics

    Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley …
  6. physics

    Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley …
  7. Physics help

    Two masses m1 = 2 kg and m2 = 4 kg are connected by a light string. Mass m2 is connected to mass M = 14 kg by a string that passes over an ideal pulley. Determine the following quantities when the system is released from rest. (a) …
  8. PHYSICS

    two masses m1 = 12 kg and m2 = 13 kg are connected by a light inextensible string passing over a frictionless pulley. Find (a) acceleration of the system when released from rest (b) tension in the string ?
  9. Physics

    The Atwood Machine consists of two masses suspended form a fixed pulley. If the first mass is 0.55kg and 0.8kg, (a) what is the acceleration of the system?
  10. physics help pls

    Two masses of 200 grams and 400 grams are attached respectively at the end of the cord that passes through around a negligibly weight and frictionless pulley. a.) Find the acceleration of the system, b.) tension in each cord, c.) the …

More Similar Questions