y1 ch9 mech Flashcards
(16 cards)
when solving for the time of flight of a particle projected vertically upwards, what is the distance
0, as it returns back to its starting point
something reaches its maximum height when…
v = 0
limitations of velocity time models
item cannot instantaneously change acceleration
if equation is parallel to i + j…
it means the coefficients of i and j are equal
what does it mean if the direction is perpendicular to i
the i coefficient = 0
What directions do the unit vectors
i and j represent?
i = due East (positive x-axis)
j = due North (positive y-axis)
What are the vector conditions for “due East” of a point?
j-components are equal
i-component of the new point is greater
What are the vector conditions for “due West” of a point?
j-components are equal
i-component of the new point is less
What are the vector conditions for “due North” of a point?
i-components are equal
j-component of the new point is greater
What are the vector conditions for “due South” of a point?
i-components are equal
j-component of the new point is less
due east of origin
j = 0
What is the position vector of a point due West of the origin?
r =−ai, where a>0
j=0
Lies along the negative x-axis
What is the position vector of a point due North of the origin?
𝑟 =bj, where b>0
i=0
Lies along the positive y-axis
What is the position vector of a point due South of the origin?
𝑟 =−bj, where b>0
i=0
Lies along the negative y-axis
What is the position vector of a point due North west or North east of the origin?
North east: j component = i component
north west =j component = - i component
What does parallel motion mean in vectors?
It means their velocity vectors are scalar multiples of each other
