lectures_in_a_nutshell - Problem solving Read the...

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
0
1
x x
υ υ =
x →
( 29
0
2
x
x t υ ∆ =
y →
( 29
0
1
y y
gt υ υ = -
( 29
2
0
1
2
2
y
y t gt υ ∆ = -
( 29
2 2
0
2 3
y y
g y υ υ = - ∆
( 29
0
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
Goes
This means the direction the vehicle moves relative to