Which force gives the scale reading?

AI Thread Summary
In a stationary elevator, the scale reading reflects the weight of the bag, which is the gravitational force acting downward (mg). The normal force exerted by the scale on the bag balances this gravitational force, resulting in a net force of zero. Since the elevator is at rest, there are no additional forces acting on the bag besides gravity and the normal force. The scale measures the normal force, which equals the weight of the bag under these conditions. Thus, the scale reading corresponds directly to the weight of the bag.
MIA6
Messages
231
Reaction score
0
An elevator is at rest with a bag hanging from a spring scale. My question is Which force gives the scale reading? The mg (the weight of the bag) downward or the force exerted by the scale on the bag Fn gives the scale reading?
thanks.
 
Physics news on Phys.org
Read carefully, the elevator is at rest. Does that mean is there are other forces involved on the bag besides gravity?
 
Antineutron said:
Read carefully, the elevator is at rest. Does that mean is there are other forces involved on the bag besides gravity?

Since elevator is at rest, there is only gravity, and then I think there is a normal force reacting to the gravity.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Thread 'A bead-mass oscillatory system problem'
I can't figure out how to find the velocity of the particle at 37 degrees. Basically the bead moves with velocity towards right let's call it v1. The particle moves with some velocity v2. In frame of the bead, the particle is performing circular motion. So v of particle wrt bead would be perpendicular to the string. But how would I find the velocity of particle in ground frame? I tried using vectors to figure it out and the angle is coming out to be extremely long. One equation is by work...
Back
Top