# Shared Flashcard Set

## Details

Chapter 3
Kinematics in Two Dimensions
19
Physics
01/13/2015

Term
 displacement ("delta vector r")
Definition
 the vector drawn from the initial position ("vector r knot") at time "t knot" to the final position "vector r" at time "t"
Term
 average velocity ("vector v bar")
Definition
 "delta vector r" (displacement) divided by "delta t" (elapsed time)
Term
 instantaneous velocity ("vector v")
Definition
 the velocity of an object at an instant of time
Term
 equation for instantaneous velocity
Definition
 "vector v" = the limit as "delta t" approaches 0 of "delta vector r" over "delta t"
Term
 average acceleration ("vector a bar")
Definition
 the change in velocity ("delta vector v") divided by elapsed time ("delta t")
Term
 instantaneous acceleration ("vector a")
Definition
 the limit as "delta t" approaches 0 or "delta vector v" divided by "delta t"; as elapsed time becomes infinitesimally small, the average acceleration becomes equal to instantaneous acceleration
Term
 What is the term "components" short for?
Definition
 scalar components
Term
 Are x and y motions independent of each other?
Definition
 yes!
Term
 Can two-dimensional motion be thought of as two distinct one-dimensional motions (one for x and one for y)?
Definition
 yes!
Term
 What do symbols "x" and "y" denote?
Definition
 displacement
Term
 What does symbol "v" denote?
Definition
 velocity
Term
 What does symbol "a" denote?
Definition
 acceleration
Term
 What does symbol "v knot" denote?
Definition
 initial velocity
Term
 What does symbol "t" denote?
Definition
 elapsed time
Term
 Under what assumption can a good description of projectile motion be obtained?
Definition
 the assumption that air resistance is absent
Term
 What are the implications for acceleration in the x and y directions under projectile motion?
Definition
 ax = 0 m/s^2ay = acceleration due to gravity
Term
 range
Definition
 the horizontal distance traveled between launching & landing, assuming the projectile returns to the same vertical level at which it was fired
Term
 In projectiles, in general, if the only acceleration is that due to gravity, the shape of the path can be shown to be a _____
Definition
 parabola
Term
 Does the order of the subscripts of "vector v" matter when describing relative velocity?
Definition
 yes!
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