Reconsider Prob. 3–73. Using EES (or other) software,

Physics 105 Week 2 Notes By Lauren Faris Chapter 2: 1­D Kinematics  Sig figs are important! They do not all follow the rules with addition/subtraction. It depends on the last digit that makes a big enough difference.  Vectors need 2 components: magnitude and direction.  Scalars indicate only magnitude.  You add 2 vectors by placing them head to tail.  With vectors, b + (-b) = 0 is additive inverse.  With vectors, R = a – b = a + (-b) (vector subtraction).  A y Asin(theta)  A x Acos(theta)  Relations among vectors do not depend on the origin or the orientation of the axes.  Multiplying a vector by a scalar changes the magnitude, not the direction: a * s = sa  The scalar product can be positive, negative, or zero.  A unit vector has a magnitude of 1 without units.  Any vector can be expressed as: A = A i + Axj + Ayk z  The vector product, or cross-product, of two vectors is: C = A x B  The direction of the vector product can be found using the right hand rule.  The vector product is not commutative: A x B = -B x A  The study of motion is called kinematics.  Forces cause motion.  A displacement vector starts at an object’s initial position.  The change in a particle’s coordinate (along the x-axis) is its 1-D displacement vector: deltaX = X – X a2d th1 average x- velocity is Vavg-x= deltaX / deltaT  Average speed is the ratio of the total distance traveled and the total time duration that is a scalar quantity.  S avg= total distance / deltaT  Instantaneous velocity is at