# Calc Forces on Pulleys: 200N, 300N Masses, No Friction

• Est120
In summary, the problem involves a system with two objects, one with a weight of 200 N and the other with a weight of 300 N. The pulleys in the system have negligible mass and no friction. Pulley P1 is stationary while pulley P2 can freely move up and down. The goal is to calculate the tensions (FT1 and FT2) and acceleration of each body. According to the problem, the forces acting on pulley P2 are 2FT2 upward and FT1 downward. This can be observed if we consider the relevant equation F=ma. The problem is found in the Schaum Physics book 10th edition, problem 3.37. Additionally, the problem asks how far mass
Est120
Homework Statement
In Figure 3-25, the weights of the objects are 200 N and 300 N. It is considered
that the pulleys have no friction and that their masses are negligible. Pulley
P1 has a stationary axis, the P2 pulley can raise or lower freely.
Calculate the tensions FT1 and FT2, as well as the acceleration of each body
Relevant Equations
F=m a
Homework Statement: In Figure 3-25, the weights of the objects are 200 N and 300 N. It is considered
that the pulleys have no friction and that their masses are negligible. Pulley
P1 has a stationary axis, the P2 pulley can raise or lower freely.
Calculate the tensions FT1 and FT2, as well as the acceleration of each body
Homework Equations: F=m a

this problem is in the schaum physics book 10 ed 3.37 and says something like this:

Mass B rises and mass A falls. This can be seen if it is observed that the forces acting on the P2 pulley are 2FT2 up and FT1 down

WHY does the forces acting on P2 pulley are 2FT2?

Last edited by a moderator:
You want to write out your relevant equation to show this.
How far does B go up if A lowers ##x## m ?
So how fast does B go up when A lowers with speed ##v## m/s?
What does that mean for the acceleration of B wrt that of A ?

## 1. How do I calculate the total force on a pulley system with two masses and no friction?

To calculate the total force on a pulley system with two masses and no friction, you will first need to find the individual forces on each mass. The force on each mass can be calculated by multiplying its mass by the acceleration due to gravity (9.8 m/s^2). Once you have the individual forces, you can add them together to find the total force on the pulley system.

## 2. What is the purpose of calculating the forces on a pulley system?

Calculating the forces on a pulley system allows us to understand the mechanical advantage of the system and determine how much weight or force can be lifted or moved. It also helps us understand the tension and balance of forces within the system.

## 3. How does the number of pulleys affect the forces on a pulley system?

The number of pulleys in a system does not affect the forces acting on the pulleys. However, it can change the direction of the force and distribute the weight or force among multiple ropes or cables, making it easier to lift or move heavy objects.

## 4. What would happen to the forces on a pulley system if there was friction present?

If there was friction present in a pulley system, it would increase the total force required to lift or move an object. This is because friction creates resistance, causing some of the applied force to be lost and making it harder to overcome the weight of the object.

## 5. How can I use the forces on a pulley system to determine the mechanical advantage?

The mechanical advantage of a pulley system can be determined by comparing the force applied to the system (input force) to the force required to lift or move the object (output force). The ratio of these two forces is the mechanical advantage, and it can be calculated by dividing the output force by the input force.

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