Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Sections 807, 808, 809 Lecture 6

Overview of Today’s Class Vectors Two-Dimensional Motion

Russian fable: Swan, Crawfish, and Pike Lake FcFc FpFp River FsFs Find F s and F c if F p, θ, and  are given Despite their huge effort the box does not move!

Given two vectors, and a) find the magnitude of each vector b) Write an expression for the vector difference using unit vectors

Given two vectors, and a) Find the components of the vector b) Find the magnitude of and the tangent of the angle makes with the x axis. Quiz

a) Express the vectors,, and in terms of their components. y x b) Find the components of the fourth force, that should be added for the object to be in static equilibrium.

A cannon at the origin points up at an angle θ with the x axis. A shell is fired which leaves the barrel with a velocity of magnitude V m. a)When does the shell reach its maximum height? b)What is the maximum height? c)What is the range (horizontal distance)? d)What is the velocity of the shell when it hits the ground?

Have a great day! Hw: All Chapters 3 and 4 problems and exercises Reading: Chapters 5 & 6