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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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5. The Laws of Motion 5.1 The Concept of Force5.2 Newton’s First Law and Inertial Frames5.3 Mass5.4 Newton’s Second Law5.5 The Force of Gravity and Weight5.6.

5. The Laws of Motion 5.1 The Concept of Force5.2 Newton’s First Law and Inertial Frames5.3 Mass5.4 Newton’s Second Law5.5 The Force of Gravity and Weight5.6.

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