Introduction Forces Physics 7C lecture A Thursday September 22, 12:30 PM – 1:50

Introduction Forces Physics 7C lecture A Thursday September 22, 12:30 PM – 1:50 www.phwiki.com

Introduction Forces Physics 7C lecture A Thursday September 22, 12:30 PM – 1:50

Ghost,, Morning Show Host/Producer has reference to this Academic Journal, PHwiki organized this Journal Introduction Forces Physics 7C lecture A Thursday September 22, 12:30 PM – 1:50 PM DBH 1500 Course in as long as mation Class website: you can find the link in eee.uci.edu http://www.physics.uci.edu/~xia/X-lab/Teaching.html Textbook: Young & Freedman, University Physics with Modern Physics (13th edition) Course in as long as mation Instructor: Jing Xia 210F Rowl in addition to Hall, email: xia.jing@uci.edu Lecture: Tuesday/Thursday, 12:30 PM – 1:50 PM in DBH 1500 TA: Hakimi, Sahel sahelh@uci.edu Discussion sessions by TA: Classical Physics Dis C1 (47251), WED 9:00 am – 9:50 am in PSCB 240 Classical Physics Dis C2 (47252), WED10:00 am – 10:50 am in SSL 152 Classical Physics Dis C3 (47253), WED11:00 am – 11:50 am in SSL 159

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Course in as long as mation 7C Grade: Final Exam (30%) Midterm Exam 1 (20%) Midterm Exam 2 (20%) Graded Online Homework (sum all assignment points) (20%) Quiz in weekly Discussion Sessions (10%) Course in as long as mation Midterm 1 (Chapters 4, 5, 6 in addition to 7): TBD Midterm 2 (Chapters 8, 9 in addition to 10): TBD Final Exam (Comprehensive, with emphasis on the chapter 8 onwards): Two-hour exam on TBD Exams are closed-book, closed-note. Course schedule

Course in as long as mation Detailed class in as long as mation can be found @: http://www.physics.uci.edu/~xia/X-lab/Teaching.html there is a link in eee.uci.edu Goals as long as this lecture Review Physics 2 concepts To underst in addition to the meaning of as long as ce in physics To view as long as ce as a vector in addition to learn how to combine as long as ces Review physics 2 Units in addition to physical quantities Motion in 1D Motion in 2D in addition to 3D

The nature of physics Physics is an experimental science in which physicists seek patterns that relate the phenomena of nature. The patterns are called physical theories. A very well established or widely used theory is called a physical law or principle. Unit prefixes Table 1.1 shows some larger in addition to smaller units as long as the fundamental quantities. Uncertainty in addition to significant figures—Figure 1.7 The uncertainty of a measured quantity is indicated by its number of significant figures. For multiplication in addition to division, the answer can have no more significant figures than the smallest number of significant figures in the factors. For addition in addition to subtraction, the number of significant figures is determined by the term having the fewest digits to the right of the decimal point. Refer to Table 1.2, Figure 1.8, in addition to Example 1.3. As this train mishap illustrates, even a small percent error can have spectacular results!

Vectors in addition to scalars A scalar quantity can be described by a single number. A vector quantity has both a magnitude in addition to a direction in space. In this book, a vector quantity is represented in boldface italic type with an arrow over it: A. The magnitude of A is written as A or A. Drawing vectors—Figure 1.10 Draw a vector as a line with an arrowhead at its tip. The length of the line shows the vector’s magnitude. The direction of the line shows the vector’s direction. Figure 1.10 shows equal-magnitude vectors having the same direction in addition to opposite directions. Adding two vectors graphically—Figures 1.11–1.12 Two vectors may be added graphically using either the parallelogram method or the head-to-tail method.

Displacement, time, in addition to average velocity—Figure 2.1 A particle moving along the x-axis has a coordinate x. The change in the particle’s coordinate is x = x2 x1. The average x-velocity of the particle is vav-x = x/t. Figure 2.1 illustrates how these quantities are related. Position vector The position vector from the origin to point P has components x, y, in addition to z. The x in addition to y motion are separable—Figure 3.16 The red ball is dropped at the same time that the yellow ball is fired horizontally. The strobe marks equal time intervals. We can analyze projectile motion as horizontal motion with constant velocity in addition to vertical motion with constant acceleration: ax = 0 in addition to ay = g.

Tranquilizing a falling monkey Where should the zookeeper aim Follow Example 3.10. Introduction to as long as ces We’ve studied motion in one, two, in addition to three dimensions but what causes motion This causality was first understood in the late 1600s by Sir Isaac Newton. Newton as long as mulated three laws governing moving objects, which we call Newton’s laws of motion. Newton’s laws were deduced from huge amounts of experimental evidence. The laws are simple to state but intricate in their application. What are some properties of a as long as ce

There are four common types of as long as ces The normal as long as ce: When an object pushes on a surface, the surface pushes back on the object perpendicular to the surface. This is a contact as long as ce. Friction as long as ce: This as long as ce occurs when a surface resists sliding of an object in addition to is parallel to the surface. Friction is a contact as long as ce. There are four common types of as long as ces II Tension as long as ce: A pulling as long as ce exerted on an object by a rope or cord. This is a contact as long as ce. Weight: The pull of gravity on an object. This is a long-range as long as ce. What are the magnitudes of common as long as ces

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Drawing as long as ce vectors—Figure 4.3 Use a vector arrow to indicate the magnitude in addition to direction of the as long as ce. Superposition of as long as ces—Figure 4.4 Several as long as ces acting at a point on an object have the same effect as their vector sum acting at the same point. Decomposing a as long as ce into its component vectors Choose perpendicular x in addition to y axes. Fx in addition to Fy are the components of a as long as ce along these axes. Use trigonometry to find these as long as ce components.

Notation as long as the vector sum—Figure 4.7 The vector sum of all the as long as ces on an object is called the resultant of the as long as ces or the net as long as ces. Superposition of as long as ces—Example 4.1 Force vectors are most easily added using components: Rx = F1x + F2x + F3x + , Ry = F1y + F2y + F3y + . See Example 4.1 (which has three as long as ces).

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