# ch4 - Histogram g Exam 1 Count 89 Average 47.8 Median 47.0...

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Histogram Exam 1 Count: 89 verage: 7.8 Average: 47.8 Median: 47.0 Maximum: 100.0 Minimum: 0.0 Standard Deviation: 23.94 D C B A 1

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dvice Advice Find a work /study group. Read the book before class. Discuss and try to apply the concepts you learn. scuss a d y o app y e co cep s you ea Solve more problems than those in the homeworks. Where to get help: riends / classmates Friends / classmates SI sessions Q-lab structor’s office hours Instructor s office hours Come talk to me if you are having problems.
Dynamics Ch. 4 Laws of Motion inematics Equilibrium Kinematics escription of motion Kinematics Ch3. Motion in 2-D description of motion Dynamics otion f an object Ch2. Motion in 1-D motion of an object and the relationship between that otion and other h 1 motion and other physical concepts Ch. 1 Units 3

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Chapter 4 The Laws of Motion

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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 Commonly imagined as a push or pull on some object Quantity that changes the Shape of a body Size Motion Vector quantity May be a contact force or a field force

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Contact vs. Field Forces Gravitational a) b) Magnetic c) d)
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 self itself They cannot change the object’s elocity velocity

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10
Newton’s First Law An object moves with a velocity at is constant in magnitude and that is constant in magnitude and direction, unless acted on by a onzero et force nonzero net force Can be at rest or moving with a constant nonzero velocity Net force is the vector sum of all the external forces exerted on the object

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Inertia Is the tendency of an object to continue in its original motion in the absence of a force olf ball Golf ball Bowling ball
Mass A measure of the resistance of an bject to hanges in its motion object to changes in its motion due to a force he larger the mass, the less it The larger the mass, the less it accelerates under the action of a given force SI units are kg calar quantity Scalar quantity

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Newton’s Second Law Vector equation x x ma F Acceleration is directly proportional to the net rce cting on it y y ma F force acting on it as you increase the net force, the acceleration increases and acceleration is inversely proportional to the mass as you increase the mass, the acceleration decreases
Units of Force SI unit of force is a Newton (N) g 2 s m kg 1 N 1 US Customary unit of force is a pound (lb) 1 N = 0.225 lb

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Problem 4.3 A 6.0 kg object undergoes an acceleration of 2.0 m/s 2 .
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ch4 - Histogram g Exam 1 Count 89 Average 47.8 Median 47.0...

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