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Physics 101 Lecture 4

# Physics 101 Lecture 4 - Q 4,6,8 P...

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Chapter 4 The Laws of Motion Dr. Armen Kocharian Q 4,6,8 P 7,12,15,19,26,32,36,38,62,77

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Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not apply very tiny objects (< atomic sizes) objects moving near the speed of light
Forces Usually think of a force as a push or pull Vector quantity May be a contact force or a field force Contact forces result from physical contact between two objects Field forces act between disconnected objects Also called “action at a distance”

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Contact and Field Forces
Fundamental Forces Types Strong nuclear force Electromagnetic force Weak nuclear force Gravity Characteristics All field forces Listed in order of decreasing strength Only gravity and electromagnetic in mechanics

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Newton’s First Law An object moves with a velocity that is constant in magnitude and direction, unless acted on by a nonzero net force The net force is defined as the vector sum of all the external forces exerted on the object
External and Internal Forces External force Any force that results from the interaction between the object and its environment Internal forces Forces that originate within the object itself They cannot change the object’s velocity

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Inertia Is the tendency of an object to continue in its original motion
Mass A measure of the resistance of an object to changes in its motion due to a force Scalar quantity SI units are kg

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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.
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Physics 101 Lecture 4 - Q 4,6,8 P...

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