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Conditions Of Equilibrium Of
A Body
Done By : Doaa Al Mahdawi
Salah Al Sary
惶惠 悒
悋忰 悋惡惠 悒
悋悋悸 惠惶 悋
悽 惡悋
愕 :悋愆惘!
悋愆悧 惺惠ル惠 悒
悋愃惆 忰惆愕悋悵惡 悽悋
惠 悖 惠惘
惘悋愆悸 :悋愆惘!
悸惘惆 悒 惴惘惠 悒
惠悴惺 悖 惆
惡悋 惘忰惠
惡 :悋愆惘!
悋愕  悋忰惘 惠悵惘惠 悒
惡悋惆 悋愕
悋愀惡 悋惆 !
悋惘惡   :悋愆惘!
惆惘愆 忰惆
Forces
Main Objectives:
To define the Force.
To characterize the Force.
To distinguish between the different types of the Forces.
To deduce the conditions of equilibrium of two forces.
Definition of the Force:
A force is a mechanical action that may set a body in motion
or modify its motion or modify its shape.
Pulling
Characteristics of Force:
Its point of application: is the center of gravity of the body or point of
contact.
Its line of action: vertical, horizontal or oblique.
Its direction: (upward- downward), (to the right, to the left), (upward to
the right, downward to the right, upward to the left, downward to the left).
Magnitude: Its numerical value in the SI unit Newton (N)
Measurement of Force:
A force is measured using spring balance.
Its SI unit is Newton symbolized by N.
 A force is represented by force vector (convenient scale
must be chosen to draw F).
Types of Force:
Forces acting from a distance ex: magnetic force, electric
force and gravitational force.
Contact force ex: normal, pushing pulling, tension
Particular Forces:
The weight:
 The weight of a body is force acting from a distance exerted by the
earth on the object. It is also called the force of gravity.
The characteristics of weight:
 Its point of application: the center of gravity of the body.
 Its line of action: vertical.
 Its direction: downward.
 Magnitude: W = m  g.
Normal: It is a force exerted by a surface on a body. It is a contact force.
To find the characteristics of normal:
 Its point of application: point of contact.
 Its line of action: vertical
 Its direction: upward.
 Magnitude: ------
Tension: It is a force exerted by a spring or string on a body. It is a contact force.
To find the characteristics of tension:
 Its point of application: point of contact.
 Its line of action: vertical
 Its direction: upward
 Magnitude: T= k  x
Force of friction: It is a force due to the sliding (motion) of a body. It
is a contact force.
To find the characteristics of friction:
 Its point of application: point of contact.
 Its line of action: along the line of motion.
 Its direction: opposite to the motion.
 Magnitude : -----
Equilibrium of a body:
Equilibrium of a body:
When a body is in equilibrium then the two forces have:
Same line of action
Opposite direction
Same magnitude
Exercise I:
( S)
A box (S) of mass 1kg is suspended to the free end of a spring
as shown in the figure.
Take g=10N/Kg.
Name the forces acting on solid (S).
Calculate the weight of (S).
Deduce the following characteristics of a force exerted by a spring on (S):
a. Line of action .
b. Direction .
c. Magnitude .
DONE

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Forces by salah sari and doaa mahdawi

  • 1. Conditions Of Equilibrium Of A Body Done By : Doaa Al Mahdawi Salah Al Sary
  • 2. 惶惠 悒 悋忰 悋惡惠 悒 悋悋悸 惠惶 悋 悽 惡悋 愕 :悋愆惘! 悋愆悧 惺惠ル惠 悒 悋愃惆 忰惆愕悋悵惡 悽悋 惠 悖 惠惘 惘悋愆悸 :悋愆惘! 悸惘惆 悒 惴惘惠 悒 惠悴惺 悖 惆 惡悋 惘忰惠 惡 :悋愆惘! 悋愕 悋忰惘 惠悵惘惠 悒 惡悋惆 悋愕 悋愀惡 悋惆 ! 悋惘惡 :悋愆惘! 惆惘愆 忰惆
  • 3. Forces Main Objectives: To define the Force. To characterize the Force. To distinguish between the different types of the Forces. To deduce the conditions of equilibrium of two forces.
  • 4. Definition of the Force: A force is a mechanical action that may set a body in motion or modify its motion or modify its shape. Pulling
  • 5. Characteristics of Force: Its point of application: is the center of gravity of the body or point of contact. Its line of action: vertical, horizontal or oblique. Its direction: (upward- downward), (to the right, to the left), (upward to the right, downward to the right, upward to the left, downward to the left). Magnitude: Its numerical value in the SI unit Newton (N)
  • 6. Measurement of Force: A force is measured using spring balance. Its SI unit is Newton symbolized by N. A force is represented by force vector (convenient scale must be chosen to draw F).
  • 7. Types of Force: Forces acting from a distance ex: magnetic force, electric force and gravitational force. Contact force ex: normal, pushing pulling, tension
  • 8. Particular Forces: The weight: The weight of a body is force acting from a distance exerted by the earth on the object. It is also called the force of gravity. The characteristics of weight: Its point of application: the center of gravity of the body. Its line of action: vertical. Its direction: downward. Magnitude: W = m g.
  • 9. Normal: It is a force exerted by a surface on a body. It is a contact force. To find the characteristics of normal: Its point of application: point of contact. Its line of action: vertical Its direction: upward. Magnitude: ------
  • 10. Tension: It is a force exerted by a spring or string on a body. It is a contact force. To find the characteristics of tension: Its point of application: point of contact. Its line of action: vertical Its direction: upward Magnitude: T= k x
  • 11. Force of friction: It is a force due to the sliding (motion) of a body. It is a contact force. To find the characteristics of friction: Its point of application: point of contact. Its line of action: along the line of motion. Its direction: opposite to the motion. Magnitude : -----
  • 13. Equilibrium of a body: When a body is in equilibrium then the two forces have: Same line of action Opposite direction Same magnitude
  • 14. Exercise I: ( S) A box (S) of mass 1kg is suspended to the free end of a spring as shown in the figure. Take g=10N/Kg. Name the forces acting on solid (S). Calculate the weight of (S). Deduce the following characteristics of a force exerted by a spring on (S): a. Line of action . b. Direction . c. Magnitude .
  • 15. DONE