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# (1) newtons law of motion

## on Apr 08, 2011

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## (1) newtons law of motionPresentation Transcript

• Newton’s Law of Motion
• Newton’s First Law of Motion
• Every body continuous in its state of rest, or uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.
• Inertia
• The tendency of an object to resist any attempt to change its velocity
• Mass
• A measure of the inertia in the body.
• Mass is a scalar quantity and obeys the rules of ordinary arithmetic
• Newton’s Second Law of Motion
• The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
• Weight distinguished from mass
• Weight
• The weight of the body is that force exerted on the body by the pull of gravity.
• The basic relationship of FORCE and MASS is the 2 nd Law of Motion:
• In gravitational case:
• Newton’s Third Law of Motion In every action there is always opposed an equal reaction.
• Important Terms:
• Tension
• Forces which tend to PULL matter apart along some axis
• Compression
• Forces which tend to PUSH matter apart along some axis
• Friction
• Force that acts to oppose the start or continuance of sliding motion between surfaces
• Free-Body Diagram, FBD
• Free-body diagram is a pictorial representation often used by engineers to analyze the FORCES acting on the body. And the body is isolated from any effects of the surroundings.
• Sample Problem 1:
• Draw the free-body diagram of the following:
• Sample Problem 2:
• Draw the free-body diagram of the figure shown
• Seatwork: Draw the free body diagram of the following:
• Assignment:
• Draw the free body diagram of the following:
• For next meeting:
• Define the following:
• Line of action
• Equilibrium
• Conditions of equilibrium
• Static equilibrium
• Dynamic equilibrium
• Questions:
• Reference:
• Physics for Scientists and Engineers with modern Physics 7 th Edition by Jewett/Serway © 2008 Thompson Learning Inc.