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PH 121 1.1-1.5
Transcript of PH 121 1.1-1.5
Concepts of motion
Well, how did the reading go?
Any comments or questions?
Before we get too carried away
Let us get the i clickers up and going.
What is a “particle”?
A. Any part of an atom
B. An object that can be represented as a mass at a single point in space
C. A part of a whole
D. An object that can be represented as a single point in time
E. An object that has no top or bottom, no front or back
An acceleration vector
A. tells you how fast an object is going.
B. is constructed from two velocity vectors.
C. is the second derivative of the position.
D. is parallel or opposite to the velocity vector.
E. Acceleration vectors weren’t discussed in this chapter
The pictorial representation of a physics
problem consists of
A. a sketch.
B. a coordinate system.
D. a table of values.
E. all of the above.
Vector vs. Scalar
What is an example of a Scalar?
What is an example of a vector?
Vectors: need two things
magnitude and direction
are these two vectors the same?
are these two vectors the same?
Average Speed, Average Velocity
To quantify an object’s fastness or slowness, we define a ratio as follows:
Average speed does not include information about direction of motion. Average velocity does include direction. The average velocity of an object during a time interval Δt, in which the object undergoes a displacement Δr, is the vector
Velocity vs. Speed
Picture me out on my bike. And I'm cruising at comfortable
30 mph, 'cuse I'm tough.
What is my odometer actually
Because velocity is a vector, it can change in two possible ways.
1. The magnitude can change, indicating a change in speed, or
2. The direction can change, indicating that the object has changed direction.
We will concentrate for now on the first case, a change in speed.
Having seen what average Velocity is, can you
take the next inductive step?
If the change of position in time is velocity,
is there a change of velocity in time?
How far can you take this?
How does one change a vector?
Describe the motion of this object.
A particle undergoes acceleration while moving from point 1 to point 2. Which of the choices shows the velocity vector v2 as the object moves away from point 2?
"Can you go over the difference between distance and displacement? Also can you go over vectors and their relationship to displacement?"
"When you are adding or subtracting vectors is it always going to be putting the tail to the tip of the other vector?"
"What are some examples of Subtracting vectors from one another? Applicable examples. "
" How much would it cost for the United States to convert fully to metric units?"
"What is the difference between a regular vector and a displacement vector?"
"Do people really use slugs? If so, who and why, and what can we do to help them?"