lectures_in_a_nutshell - Problem solving • Read the...

Unformatted text preview: Problem solving • Read the question • (really read the question - read the question again) • Draw a diagram • (Free body diagram = all the forces on each object in the problem separately) • Define a coordinate system • Which direction is positive for x and for y? • Write down the relevant equations • (We need to understand the physics which describes the situation ) • Rearrange equations to find the unknown • This may take a couple of steps but we mustn't panic lecture 1 in a nutshell • (check out chapter 3-3.3 ) • Must know how to • Recognize a vector • Multiply vector by scalar • Add vectors using tail to tip and parallelogram rules • Be able to find the component vectors, or use component vectors to find the magnitude and direction of a vector. The lecture in a nutshell 2 Must know Total displacement total time = v t ∆ = ∆ r Total distance covered total time s = Total change in velocity total time = a t ∆ = ∆ v s = v Lecture 4 in a nutshell ( 29 1 x x υ υ = x → ( 29 2 x x t υ ∆ = y → ( 29 1 y y gt υ υ =- ( 29 2 1 2 2 y y t gt υ ∆ =- ( 29 2 2 2 3 y y g y υ υ =- ∆ ( 29 4 2 y y y t υ υ + ∆ = Motion in the vertical and horizontal directions are independent. However t is common Equations in both dimensions are necessary to solve most problems. Lecture 6/7 in a nutshell The subscript rule PG = v PT v TG + v Heading This is the direction you point the vehicle , BW v...
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