[PHYS 101]  Midterm Exam Guide  Comprehensive Notes for the exam (10 pages long!)
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Drexel
PHYS 101
MIDTERM EXAM
STUDY GUIDE
PHYS 101 LECTURE NOTES WEEK 2
Spencer Kociba
Drexel University
Lecture 3 (01/17/17)
Chapter 2: Motion Along a Straight Line
● Dot/Scalar Products
○
○ , ,
■ Because so
○
● Vectorial/Cross Products
○ A x B=C
○ B x A=C
○
○
○
● Displacement: the vector between the starting and ending point of an object’s path
○ In a straight line: and
● Distance: length of the total path traveled
● Kinematics: study of motion
● Average velocity:
●
If the x coordinate is...
Velocity is...
Direction
Positive and increasing
+
+x
Positive and decreasing

x
Negative and increasing
+
+x
Negative and decreasing

x
● Instantaneous velocity: velocity at a specific point (of time or position)
○
○ Slope of tangent line on an x(t) graph
● Acceleration
○ Average acceleration: rate of change of velocity with time
■
Lecture 4 (01/19/17)
● Instantaneous acceleration is
○
■ Signs are the same
○
■ Signs are the opposite
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If the xvelocity is
The acceleration is
+ And increasing
+ (moving in +x direction and speeding up)
 And decreasing
 (moving in +x direction and slowing down)
 And increasing
+ (moving in x direction and slowing down)
 And decreasing
 (moving in x direction and speeding up)
○ Slope of velocity is the average xacceleration
○ If acceleration is positive, velocity is concave up (increasing)
○ If acceleration is negative, velocity is concave down (decreasing)
○ If acceleration is 0, velocity is at a max or a min
■ It is still possible to be moving with 0 acceleration (you are just moving
at a constant rate)
● Motion with constant acceleration
○ a(t) graph is a horizontal line (slope is 0)
■ Area under a(t) graph is the change in velocity from time 0 to time t
○ v(t) graph is a line with a single slope (the xacceleration)
■ Area under v(t) graph is the distance traveled ( , the change in
xcoordinate from time 0 to time t
○ x(t) graph is a parabola
● Equations to know
○ Includes t, v, and a (no x)
○
Includes t, x, and a (no v)
○ Includes x, v, and a (no t)
○
Includes t, x, and v (no a)
● Free fall
○ Any kind of motion in vertical direction in which the only forces acting on an
object are gravity and air resistance
■ Air resistance is usually neglected
find more resources at oneclass.com
find more resources at oneclass.com