1
HW 2 Tips;
PHY 131 Sect. 10; Fall 2010
Prof. Pascuzzi
Information you may need;
m/s
2
“What Graphs Can Tell You”
1)
Information from graphs (i.e. slope or derivative, and area, or integration) can easily be found using the
pneumonic relationships shown below.
Remember that area of a triangle is ½
bh
, a rectangle is
LW
, and
there may be times when you have to combine both shapes and find both areas.
Also remember that
Slope
=
which has units of the vertical quantity over the horizontal quantity.
x
(to go from an “
x
” graph to velocity “
v
”, go “
down the slope
” like a skier)
v
(to go from a “
v
” graph to acceleration “
a
”, go “
down the slope
” like a skier)
a
x
(to go from a “
v
” graph to get distance “
x
”, take “
area
”)
v
(to go from an “
a
” graph to get velocity “
v
”, take “
area
”)
a
“
Problem 2.17
”
1)
Careful.
Note that average speed
is the total distance covered divided by the total
time.
2)
Average velocity, on the other hand, is the same formula, but the numerator is now total
displacement
over time.
Remember displacement is your location relative to your fixed starting
point, and is a vector.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
2
“
Problem 2.27
”
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '03
 Rijssenbeek
 Velocity, Quadratic equation, common variable, xrock

Click to edit the document details