Physics 101 Lecture 2 Kinematics: Motion in 1-Dimension
ο»ΏPhysics 101 Lecture 2 Kinematics: Motion in 1-Dimension
PHYS 101: Lecture 2
Kinematics: Velocity
Velocity: the rate of change of position
? = /. ? average ? instantaneous
PHYS 101: Lecture 2
x (mV) elocity: Plotting Position and Time
5
Tangent
Instantaneous Velocity:
the slope of tangent line at
any point on a position-time
3
graph
2
Example:
What is the instantaneous velocity:
1.25
t (s)
= 2 m and = 1 s?
1
5
= tan/ttan
tan = (3 - 2) m
tan = (1.25 - 1) s
-5
Changing Velocity
PHYS 101: Lecture 2
= 1 m = 4 m/s
0.25 s
x (mV) elocity: Plotting Position and Time
5
2 1
1
Example:
What is the average velocity between :
= 1 s and = 5 s?
= /
t (s) 5
= (1 - 2) m = (5 - 1) s
= -1 m = -0.25 m
4s
s
What does "-" mean?
-5
Changing Velocity
PHYS 101: Lecture 2
Velocity Clicker Question
If the average velocity of a car during a trip along a straight road is positive, is it possible for the instantaneous velocity at some time during the trip to be negative?
A - Yes B - No
PHYS 101: Lecture 2
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