Elevator Forces: Fupward vs Fnet vs a

In summary, the conversation discusses the confusion regarding the basic concepts of elevator design to achieve a maximum acceleration of 0.068g. The main points of confusion are the relationship between acceleration and the force required to lift the elevator, and whether the net force needs to be greater than the weight of the elevator for it to be lifted. The conversation also touches on the concept of controlling the force to achieve the desired acceleration.
  • #1
MIA6
233
0
For elevator problem in Force, I have some confusions about basic concepts. Here give an example: an elevator is to be designed so that the maximum acceleration is 0.068g. Here why would the elevator's acceleration smaller than the gravity, then can it still pull the whole elevator up? Or whether it can pull elevator up depends on the upward force not acceleration? Fnet=Fupward-Fg(weight), Is a=0.068g here net acceleration? Fnet=0.068g*m? I think Fupward must be larger than the weight, but then the net force is smaller than the weight, does it matter? I mean if the net force is smaller than the weight, will the tension still be able to pull/lift the elevator up? Or we only look at Fupward to determine if it can lift the elevator. My confusions here are: a and Fnet vs Fupward.
THanks.
 
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  • #2
The force is controlled so that the maximum acceleration of the elevator and it's load are .068g.
 
  • #3
Jeff Reid said:
The force is controlled so that the maximum acceleration of the elevator and it's load are .068g.

sry, I don't quite understand what do you mean by the force is controlled?
 

What is the difference between Fupward and Fnet in elevator forces?

Fupward refers to the upward force exerted on an elevator by the tension in the supporting cable. Fnet, or net force, takes into account all the forces acting on the elevator, including its weight and the tension in the cable. Fupward is a single force, while Fnet is the sum of all forces.

What is the relationship between Fupward and the acceleration of an elevator?

The relationship between Fupward and acceleration can be explained by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it. In the case of an elevator, Fupward is the only force acting in the upward direction, so it determines the acceleration of the elevator.

How does the direction of Fnet affect the movement of an elevator?

The direction of Fnet determines the direction of the elevator's movement. If Fnet is positive, the elevator will accelerate upwards. If Fnet is negative, the elevator will accelerate downwards. If Fnet is zero, the elevator will remain at a constant velocity.

What other factors affect the forces acting on an elevator?

The forces acting on an elevator are also affected by the weight of the elevator, the weight of the passengers and cargo inside, and any external forces such as air resistance or friction. These forces can impact the overall Fnet and therefore the acceleration of the elevator.

How does understanding elevator forces help in designing and maintaining elevators?

Understanding elevator forces is crucial in designing and maintaining elevators to ensure their safe and efficient operation. By knowing the forces involved, engineers can determine the appropriate cable tension, motor power, and braking system to safely move the elevator. Additionally, understanding forces can help identify potential issues and make necessary adjustments to maintain the elevator's functionality.

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