Tuesday, October 11, 2016
8:36 AM
Acceleration
predicted motion of cart on slope
derive uniform acceleration equations
prep for lab next class - ticker tape
hand back quiz with 30 minutes left
the position-time graph is parabolic
predicted d-t equation: d
Monday, February 27, 2017
8:47 AM
Electrostatic Potential Energy and
Voltage (Electrostatic Potential)
homework:
a) A balloon has a mass of 20.0 g and hangs from
a 2.50 m string. If the charge on the balloon is
3.0 C and it gets deflected by 0.50m what is
Wednesday, February 22, 2017
9:59 AM
p854 Q39
the phase change will be 1000 wavelengths
the waves will be in phase
(textbook says 1000 x 2pi radians)
Feb 22 Snell's Law Page 1
What is the relationship between the angle of
incidence, i, and the angle of re
Monday, November 28, 2016
8:44 AM
Work and Energy and Power (Chapter 6)
Think of a scenario:
3 students
1. holding a stack of books
2. lifting a piece of paper up/down
3. holding a book up while walking sideways
Who is doing the most/least work?
thoughts?
Friday, November 18, 2016
9:32 AM
Wednesday, November 16, 2016
9:55 AM
p58
Planet? log r log T
mercury 10.76 6.88
Log y = x
y=10x
Log 10 = 1
log 1000 = 3
log 1016 = 16
graph log r vs log T
Fc = Fg
Nov 18 keppler and quiz Page 1
Nov 18 keppler and quiz Pag
Tuesday, October 04, 2016
10:54 AM
Lab recap
Perpendicular Vectors are Independent
videos: https:/www.youtube.com/watch?
v=DVU93vLzI1k
If you swim across a river with a strong current,
is it faster to direct yourself straight across and
let the current pu
Tuesday, November 22, 2016
8:45 AM
nov 22 review Page 1
nov 22 review Page 2
nov 22 review Page 3
nov 22 review Page 4
nov 22 review Page 5
nov 22 review Page 6
nov 22 review Page 7
nov 22 review Page 8
Test next class
Circular motion and Gravity
nov 22 r
Thursday, November 17, 2016
12:22 PM
1. A 200g mass and a 250g mass are suspended
over a pulley. Determine the acceleration of the
masses and the tension in the connecting cord.
Nov 17 Pulley and Quiz Page 1
Nov 17 Pulley and Quiz Page 2
Nov 17 Pulley and
Friday, November 18, 2016
12:20 PM
Gravity, Hooke and Work
Back to Newton/Cavendish:
1. What is the gravitational attraction between a
60.0kg student and a 50.0 kg student 1.5 m apart?
Why don't they slide together. Fg =
2. g on Earth is 9.81 N/kg, if the
STUDENT ACHIEVEMENT
PHYSICS 12 FORMULAE
Vector Kinematics in Two Dimensions
v + v0
2
v = v0 + at
v=
v 2 = v02 + 2ad
1
d = v0t + at 2
2
Fg = G
Fg = mg
m1m2
r2
Electrostatics
F =k
Vector Dynamics
Fnet = ma
Gravitation
Q1Q2
r2
V=
E=
Ep
E=
Q
F
Q
E=k
Q
r2
V
d
Tuesday, February 21, 2017
2:03 PM
Half-Life and Binding Energy
Last class - alpha beta gamma decay
the natural decay happens randomly
Model this by each hand being a undecayed
radioactive atom.
N is the number of atoms or mass of the atoms or
the activit
Monday, November 21, 2016
12:23 PM
Hooke's Law - Elastic Forces - not in textbook
Lab activity - not a report
Hand in Friday graph of the elastic force vs
extension on a spring and an elastic band with a
equation for each relationship
just the graph with
Wednesday, October 12, 2016
8:41 AM
Acceleration
a is the rate of change in velocity
for uniform acceleration
a= (vf-vi)/t or slope of the v-t graph
displacement is the area under a v-t
graph so
d=1/2 (vf+vi)t
what if you have problems involving other set
Monday, November 21, 2016
8:50 AM
Hooke's Law
Get elastic bands and springs.
pull with a spring scale and measure the extension,
x = change in length, L
graph F vs x
F(N) F(N) x=L-Lo (cm)
elastic spring
0
0
0
2.0
4.0
6.0
8.0
10.0
12.0
A perfectly elastic
Tuesday, January 03, 2017
10:17 AM
Work, Power and efficiency
Simple machines
- pulleys, inclined plane, wedge, levers, wheel
and axel
you apply a force and another force results
input force and the output force
look at a simple lever
ideal machine, no wo
https:/academo.org/demos/electric-field-line-simulator/
Wednesday, February 22, 2017
8:43 AM
Electric Fields, E (not energy)
http:/www.falstad.com/vector3de/
(gravitational field strength, g, is the force per unit
mass g=F/m = GM/r2 caused by a large mass
Lecture 1/2/3 Forces
Chapter 3.1-3.12
Force; interaction b/w separate objects and is used to describe and measure the
interaction.
-Have two quantitative properties; magnitude and direction
-Categorized as either contact, or contact free
Four Fundamental
Internal assessment
Practical work and internal assessment
General introduction
The internal assessment requirements are the same for biology, chemistry and physics. The internal
assessment, worth 20% of the final assessment, consists of one scientific
Tuesday, February 28, 2017
8:51 AM
p631
Q13
a) 1.67x9=15.03
1.5x10-10J
b) 1eV = 1.602x10-19J
1.5/1.602=0.9363
9.4x108eV
c) proton and anti-proton collide and annihilate
both have the same mass
E for both = 2 x E for a proton
3.0x10-10J or 9.4x2=18.8 1.9x1
Wednesday, November 30, 2016
8:42 AM
Term 1 test next class - omit it if it lowers your mark
What topics did we study?
Vectors
add vectors you draw them head to tail
subtract - flip the direction of the second vector
cosine law, sine law
components
Vx=Vco
Thursday, October 06, 2016
10:17 AM
Hand in Lab
vector questions?
projectiles\
p62-63
Q23 b)
Projectiles An object moving through space under the
influence of gravity without propulsion.
bird is not a projectile
dead bird is a projectile
assumption - assu
Thursday, October 20, 2016
8:39 AM
How would the graphs change if you threw a
balloon instead of a basketball?
d-t, v-t, a-t
moon landing video
https:/www.youtube.com/watch?v=5C5_dOEyAfk
feather videos
https:/www.youtube.com/watch?v=_XJcZ-KoL9o&feature=re
Friday, November 25, 2016
12:29 PM
Review Problems from Chapter 5
p107 q21
nov 25 Review 2 and Momentum Page 1
nov 25 Review 2 and Momentum Page 2
nov 25 Review 2 and Momentum Page 3
Momentum and Impulse (chapter 9)
nov 25 Review 2 and Momentum Page 4
Mom
Wednesday, November 23, 2016
12:23 PM
1. You pull a spring with a force scale and it stretches
from 15.0 cm to 19.0 cm with 6.0 N of force.
a) What is the extension?
x=change in length = 19.0-15=4.0cm
b) what is the elastic constant, k, for the spring?
Fe
Thursday, February 23, 2017
1:53 PM
Last class:
eg. An electron and positron annihilate. How much
energy is given off?
mass of electron is 9.11x10-31kg (same for
positron).
E=mc2 = 2x(9.11x10-31kg)x(3.00x108m/s)2
2x9.11x3x3=163.98
= 1.64 x 10-13J
2x9.11E-