How Does Newton's Third Law Apply to Stacked Blocks in an Elevator?

AI Thread Summary
In the discussion about stacked blocks in an elevator, the focus is on analyzing the forces acting between the blocks and the floor while the elevator is at rest. The forces include interactions between the three blocks (3kg, 2kg, and 1kg) and the floor. The user attempts to rank the forces from largest to smallest, suggesting that the force of the floor on the 1kg block and the force of the 1kg block on the floor are the largest, followed by the forces between the blocks. Clarification is sought on whether this ranking is correct. Understanding these forces is essential for applying Newton's Third Law in this scenario.
jessemarquez
Messages
2
Reaction score
0

Homework Statement


Three blocks are stacked on top of each other inside an elevator as shown in the figure.
Answer the following questions with reference to the eight forces defined as follows.

the force of the 3kg block on the 2kg block, F of 3 on 2,
the force of the 2kg block on the 3kg block, F of 2 on 3,
the force of the 3kg block on the 1kg block, F of 3 on 1,
the force of the 1kg block on the 3kg block, F of 1 on 3,
the force of the 2kg block on the 1kg block, F of 2 on 1,
the force of the 1kg block on the 2kg block, F of 1 on 2,
the force of the 1kg block on the floor, F of 1 on floor, and
the force of the floor on the 1kg block, F of floor on 1.

Assume the elevator is at rest. Rank the magnitude of the forces.
Rank from largest to smallest.

__________
| |
| |
| 3 kg |
|________|
| |
| 2 Kg |
|______ |
| |
| 1 kg |
|______|______

The Attempt at a Solution


F of floor on 1 and F 1 on floor, F of 3 on 2 and F of 2 on 3, F of 2 on 1 and F of 1 on 2, F of 3 on 1 and F of 1 on 3.
 
Last edited:
Physics news on Phys.org
can anyone offer any insight if the order stated is correct.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top