Find Answers to Your Questions About 3 Forces in Equilibrium

  • Thread starter Razzor7
  • Start date
In summary, the problem involves finding the magnitude of a third equalizing force C in a particle that is in equilibrium and has three forces acting on it. Two of the forces, A and B, are described by their angles and integer lengths in the y-z and x-z planes respectively. However, there is confusion about the interpretation of the angle Beta in the x-z plane. One possible interpretation is that it is the angle of force B, while another is that it is (90 degrees - Beta). The problem statement may be ambiguous without diagrams.
  • #1
Razzor7
49
0

Homework Statement



3 forces act on a particle, it is in equilibrium, I am told about two of the three, asked to find the third.

We have a certain force A and it is in the y-z plane, described by a certain angle Beta. Then I'm told that there is a second force B in the x-z plane, described by integer lengths of a similar right triangle. What does that mean?

I have 2 attempts left on this question so I want to be sure. I am assuming it means it is described by the angle Beta in the x-z plane, but this isn't correct according to the website. What other interpretations could there be?

Attempts

I'll give you the numbers and my answer using the above: Beta is 31* A = 15.5 and B = 20.5
Magnitude of C, the third equalizing force?

Well sin31(A)+cos31(B) is the magnitude of the z component of the equalizing force. sin31(B) is the magnitude of the x component and cos31(A) is the magnitude of the y component. Squaring, adding, square rooting these terms gives 30.67 to 3 sig figs = 30.7, which is "wrong."

edit: I think I solved it by finding a diagram hidden under "hints" but can anyone confirm if the problem statement (as above) is ambiguous?
 
Last edited:
Physics news on Phys.org
  • #2
Razzor7: One guess might be, force B is at an angle beta, which you already tried. A second all-out guess for the italicized phrase might be that it means force B is at an angle (90 deg - beta), except that it sounds like it might want you to increment the similar triangle only to leg lengths that are integers, which would give only certain lengths for vector B (?). We might be somewhat at a loss without the diagrams.
 

FAQ: Find Answers to Your Questions About 3 Forces in Equilibrium

What is meant by "3 Forces in Equilibrium"?

In physics, equilibrium refers to a state in which all forces acting on an object are balanced, resulting in a net force of zero. In the case of 3 forces, this means that the sum of all three forces must be equal to zero for the object to be in equilibrium.

What are the 3 types of forces that can be in equilibrium?

The 3 forces in equilibrium are tension, compression, and shear. Tension is a pulling force that stretches an object, compression is a pushing force that compresses an object, and shear is a force that causes one part of an object to slide past another part.

How do you calculate the magnitude and direction of forces in equilibrium?

To calculate the magnitude and direction of forces in equilibrium, you can use the principles of vector addition. This involves breaking down each force into its x and y components, and then adding them together to find the resultant force. The magnitude can be calculated using the Pythagorean theorem, and the direction can be determined using trigonometric functions.

What is the difference between static and dynamic equilibrium?

In static equilibrium, an object is at rest and all forces are balanced. In dynamic equilibrium, an object is moving at a constant velocity and all forces are balanced. In both cases, the net force is equal to zero, but in dynamic equilibrium, the object is in motion.

Why is understanding forces in equilibrium important?

Understanding forces in equilibrium is crucial in various fields of science and engineering. It allows us to analyze and predict the behavior of objects and structures under different forces, ensuring their stability and safety. It also helps us understand how forces interact and how to achieve balance in systems, which is essential in many technological applications.

Similar threads

Replies
6
Views
2K
Replies
2
Views
6K
Replies
9
Views
5K
Replies
1
Views
399
Replies
1
Views
2K
Replies
9
Views
3K
Back
Top