المحاضرة السابعة the laws of motion chapter 5 5.1 the concept of force the body is...
TRANSCRIPT
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السابعة المحاضرة
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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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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5.3 Mass
. 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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Mass and weight
The Weight of an object (W):
. W = the gravitational force exerted on the object
. W varies with locationThe Mass (m) :
. Is the same everywhere
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5.4 Newton’s Second Law
“The acceleration of an object is directlyproportional to the net force acting on it and
inversely proportional to its mass.”
: is the net forcea : the acceleration.m: mass.
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5.4 Newton’s Second Law
SI unit of force:
CGS unit of force:
2s
mKgNewton
2s
cmgDyne
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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
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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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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