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Activity 1: Find My Letter
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
6 13 22 12 24 1 5 4 9 25 19 2 3 7 14 18 15 17 21 11 8 10 16 20 23 26
EQUILIBRIUM
Learning Objectives:
1. Identify the first condition
for equilibrium.
2. Determine whether the
system is in equilibrium or
not.
3. Solve problems involving
static equilibrium.
Activity 2: Equilibrium All Around Me!
Object in
Equilibrium
Forces Acting on
the Object
Static
concerned with the calculation of forces acting on and within
structures that are in equilibrium.
Equilibrium
The condition of a system when neither its state of motion nor
its internal energy state tends to change with time. The
equilibrium equation states that the net force must be zero. The
net force acting on the object must be zero.
Center of Gravity
is the point where its entire weight may be assumed
concentrated.
Two Conditions for Equilibrium
Definition Formula
Translational Equilibrium Equilibrium is a condition
where there is no change
in the state of motion of a
body.
𝛴𝐹 = 0
It may be resolved into
horizontal and vertical
components
𝛴𝐹𝑥 = 0
𝛴𝐹𝑦 = 0
Rotational Equilibrium Equilibrium is a condition
where the sum of the
torques about any point
must be zero.
𝛴𝜏 = 0
Two Conditions for Equilibrium
Definition Formula
Translational Equilibrium Equilibrium is a condition
where there is no change
in the state of motion of a
body.
𝛴𝐹 = 0
It may be resolved into
horizontal and vertical
components
𝛴𝐹𝑥 = 0
𝛴𝐹𝑦 = 0
Rotational Equilibrium Equilibrium is a condition
where the sum of the
torques about any point
must be zero.
𝛴𝜏 = 0
Sample Problem
1. You hang your picture frame by means of a vertical string.
Two strings in turn support this string. Each string makes
30° with an overhead horizontal beam. Find the tension in
the strings. The weight of the frame is 55 N.
How do forces acting on a body
affect its stability?
If the total force acting on the body is zero is zero, then the body is
at rest or uniform rectilinear motion. If the total force acting on the
body is not equal to zero, then the body will have an acceleration
(a= F/m) in the direction of the total force.
If an object is at equilibrium, then the forces are
balanced. Balanced is the key word that is used to
describe equilibrium situations.
What are the forces acting on a body in
equilibrium?
Try this out!
1. You hang your picture frame by means of a vertical string.
Two strings in turn support this string. Each string makes
30° 𝑎𝑛𝑑 60° with the horizontal. Find the tension in the
strings. The weight of the frame is 55 N.

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EQUILIBRIUM-TOPIC.pdf

  • 1. Activity 1: Find My Letter A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 6 13 22 12 24 1 5 4 9 25 19 2 3 7 14 18 15 17 21 11 8 10 16 20 23 26
  • 3. Learning Objectives: 1. Identify the first condition for equilibrium. 2. Determine whether the system is in equilibrium or not. 3. Solve problems involving static equilibrium.
  • 4. Activity 2: Equilibrium All Around Me! Object in Equilibrium Forces Acting on the Object
  • 5. Static concerned with the calculation of forces acting on and within structures that are in equilibrium. Equilibrium The condition of a system when neither its state of motion nor its internal energy state tends to change with time. The equilibrium equation states that the net force must be zero. The net force acting on the object must be zero. Center of Gravity is the point where its entire weight may be assumed concentrated.
  • 6. Two Conditions for Equilibrium Definition Formula Translational Equilibrium Equilibrium is a condition where there is no change in the state of motion of a body. 𝛴𝐹 = 0 It may be resolved into horizontal and vertical components 𝛴𝐹𝑥 = 0 𝛴𝐹𝑦 = 0 Rotational Equilibrium Equilibrium is a condition where the sum of the torques about any point must be zero. 𝛴𝜏 = 0
  • 7. Two Conditions for Equilibrium Definition Formula Translational Equilibrium Equilibrium is a condition where there is no change in the state of motion of a body. 𝛴𝐹 = 0 It may be resolved into horizontal and vertical components 𝛴𝐹𝑥 = 0 𝛴𝐹𝑦 = 0 Rotational Equilibrium Equilibrium is a condition where the sum of the torques about any point must be zero. 𝛴𝜏 = 0
  • 8. Sample Problem 1. You hang your picture frame by means of a vertical string. Two strings in turn support this string. Each string makes 30° with an overhead horizontal beam. Find the tension in the strings. The weight of the frame is 55 N.
  • 9. How do forces acting on a body affect its stability? If the total force acting on the body is zero is zero, then the body is at rest or uniform rectilinear motion. If the total force acting on the body is not equal to zero, then the body will have an acceleration (a= F/m) in the direction of the total force.
  • 10. If an object is at equilibrium, then the forces are balanced. Balanced is the key word that is used to describe equilibrium situations. What are the forces acting on a body in equilibrium?
  • 11. Try this out! 1. You hang your picture frame by means of a vertical string. Two strings in turn support this string. Each string makes 30° 𝑎𝑛𝑑 60° with the horizontal. Find the tension in the strings. The weight of the frame is 55 N.