PHY131H1S – Class 2
The “Clickers”
Status Light
Today:
• Position, velocity,
and acceleration
• Problem solving
• Scaling
Power Light
When we start
asking you
questions:
• Will flash green
when your
response is
registered
Problem Set 1 on
MasteringPhysics
due Friday at
11:59PM
• Will flash red if
On/Off Switch
your response is
Please turn on your clicker now
not registered
2
Which car is going faster, A or B?
Assume these are both motion diagrams.
B
A
What is zero divided by zero?
A.
B.
C.
D.
Have you ever taken physics
before?
A. I took Grade 12 Physics in High School
(or equivalent or higher)
B. The highest I took was Grade 11
Physics
C. I took some physics but not as high as
Grade 11 or 12.
D. I have never taken a class called
Physics before
E. It’s complicated…
Tactics: Finding the acceleration vector
Zero
Infinity
One
Undefined
1
Tactics: Finding the acceleration vector
r
A particle undergoes acceleration a while
moving from point 1 to point 2. Which
r of
the choices shows the velocity vector v 2 as
the object moves away from point 2?
Tactics: Finding the acceleration vector
r
A particle undergoes acceleration a while
moving from point 1 to point 2. Which
r of
the choices shows the velocity vector v 2 as
the object moves away from point 2?
Rank in order, from the most to the least, the
number of significant figures in the following
numbers.
a. 8200 b. 0.0052 c. 0.430 d. 4.321 × 10−10
A.
B.
C.
D.
E.
a=b=d>c
b=d>c>a
d>c>b=a
d>c>a>b
b>a=c=d
2