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المحاضرة السابعة The Laws of Motion

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The Laws of Motion Chapter 5

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5.1 The Concept of Force The body is moving, When it change its position during a limited time.

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5.1 The Concept of Force Types of Motion:

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**. Force is a vector quantity**

5.1 The Concept of Force . An object accelerates due to an external force. . Force is a vector quantity

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**Definition of equilibrium**

object is in equilibrium if: The net force acting on the object is zero, . The object remains at rest. . or continues to move with constant velocity.

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**Measuring the Strength of a Force**

It is convenient to use the deformation of a spring to measure force.

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**Newton ‘s laws of motion**

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FIRST NEWTON’s LAW SECOND NEWTON’s LAW THIRD NEWTON’s LAW

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**5.2 Newton’s First Law Newton’s first law (law of inertia):**

“ In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity (that is, with a constant speed in a straight line).”

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**. The SI unit of mass is the kilogram (Kg). **

. Mass (m) is that property of an object that specifies how much resistance an object exhibits to changes in its velocity. . The SI unit of mass is the kilogram (Kg). . mass is a scalar quantity

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5.3 Mass

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**The Weight of an object (W):**

Mass and weight The Weight of an object (W): . W = the gravitational force exerted on the object . W varies with location The Mass (m): . Is the same everywhere

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**5.4 Newton’s Second Law “The acceleration of an object is directly**

proportional to the net force acting on it and inversely proportional to its mass”. :is the net force a : the acceleration. m: mass.

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5.4 Newton’s Second Law SI unit of force: CGS unit of force:

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5.4 Newton’s Second Law

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5.4 Newton’s Second Law

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Example 5.1

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Question 2

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Question 3

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Problem 5.1

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Problem 5.3

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Problem 5.11

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Problem 5.11

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**5.5 The Gravitational Force and Weight**

Gravitational force Fg :The attractive force exerted by the Earth on an object. . The magnitude of Fg: . Direction: Toward the center of earth

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**5.5 The Gravitational Force and Weight**

Nora decided to live on the moon surface because her weight becomes list than her Wight on the surface of the earth? what is your opinion?

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**5.5 The Gravitational Force and Weight**

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**5.5 The Gravitational Force and Weight**

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Problem 5.9

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5.6 Newton’s Third Law “If two objects interact, the force F12 exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force F21 exerted by object 2 on object 1”:

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**. act on different objects . . and must be of the**

5.6 Newton’s Third Law “The action force is equal in magnitude to the reaction force and opposite in direction.” The action and reaction forces: . act on different objects . . and must be of the same type.

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5.6 Newton’s Third Law

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**5.7 Some Applications of Newton’s Laws**

.Tension Force . Frictional Force: (in opposite of mosion direction) . Elevator . The Atwood Machine . Inclined surface

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**Example 5.4 A Traffic Light at Rest**

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**Example 5.4 A Traffic Light at Rest**

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Inclined Surface

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**One Block Pushes Another**

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Elevator

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**Example 5.8 Weighing a Fish in an Elevator**

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**Example 5.8 Weighing a Fish in an Elevator**

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The Atwood Machine

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**Acceleration of Two Objects Connected by a Cord**

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Problem 21

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Problem 21

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Problem 23

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Problem 24

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