Download Physical Science Bell Ringers

Physical
Science Bell
Ringers
Fall semester
2011-12
December 9, 2011
Machines
make work easier in
two ways, one way is by
changing the direction of the
applied force, what is the other
way?
 Turn
in 5 bell ringers from this week
December 8, 2011
 Sally
and Pete do the same amount of
work. Sally does the work in 2.3 hours and
Pete does it in 2.5 hours. Who is more
powerful? Explain.
December 7, 2011
 How
much power will it take to move a 10
kg mass at an acceleration of 2 m/s/s a
distance of 10 meters in 5 seconds? This
problem requires you to use the formulas
for force, work, and power all in that
order.
December 6, 2011
 The
fixed pulley shown in the
Figure does which one of the
following?




a. decreases the force required and
changes the direction of the force
required
b. doubles the force required to lift the
block
c. decrease the force required to lift
the block
d. makes the block easier to lift by
changing the direction of the force
needed to lift it
December 5, 2011
A
machine that changes only the
direction of a force has a
mechanical advantage of ____.
 a.
 b.
 c.
 d.
1
5
100
10
December 2, 2011
Explain
how machines
make work easier.
 1st
& 4th = Turn in 7 bell ringers
 5th = turn in 6 bell ringers (no BR yesterday)
December 1, 2011
Calculate
the power of an
object that does 5500 J of
work for 33 seconds.
November 30, 2011
Calculate
work and power if
you have a 3500 N force
acting on an object to move it
5 meters in 40 seconds.
November 29, 2011
What
is work?
November 28, 2011
 Add
to 2 bell ringers from last week
Describe
your favorite dish
that you ate over
Thanksgiving break.
November 22, 2011
What
country launched the
world's first man-made satellite,
Sputnik, into Earth orbit on
October 4, 1957?
 Save
bell ringers in your folder, we will turn
them in next week with those bell ringers
November 21, 2011
 Use
the formula to compute the
height of a rocket climbing 12
seconds:
S
= ½ at2
S = distance (height) traveled
a = the gravitational constant = 32 feet per second
squared = 32 ft/sec2 = 9.8 meters per second squared =
9.8 m/s2
t = time in seconds
November 18, 2011
When
you move your hand
or foot, your body has
converted potential energy
into ________ energy.
 Turn
in 4 bell ringers from this week
November 17, 2011
Which
ball in Figure 4-1 has the
greatest potential energy?
November 16, 2011
 No
Bell ringer, Mrs. Green absent
November 15, 2011
A
dump truck, a sports car, and
a bicycle are traveling at the
same velocity. Compare their
kinetic energies.
November 14, 2011
A
15-kg bicycle carrying a 45kg girl is traveling at a speed of
10 m/s. What is the kinetic
energy of the girl and bicycle?
Turn student release
form into the tray.
November 11, 2011
Define
the law of
conservation of
energy
 Turn
in 4 bell ringers from this week
Turn student release
form into the tray.
November 10, 2011
Give
an example of how
energy can be transformed
from one form to another.
Turn student release
form into the tray.
November 9, 2011
What
was your favorite part
of the rocket project so far?
Practice launch will be tomorrow!!!!!!
November 7, 2011
 What
is the kinetic energy of a 3kilogram ball that is rolling at 2
meters per second?
 The
potential energy of an apple is
6.00 joules. The apple is 3.00-meters
high. What is the mass of the apple?
m
= gh/GPE
What was the average
number of babies
that Dr. Jones
delivered each year
from 1995 to 1998?
A. 35
B. 40
C. 45
D. 50
E. 55
How many babies did Dr. Jones deliver in
1998?
A. 25
B. 35
C. 45
D. 55
E. 65
If Dr. Jones delivered 85
babies in 1999, how
many rattles would
represent this number?
A. 6 ½
B. 7
C. 7 ½
D. 8
E. 8 ½
Turn student release
form into the tray.
November 3, 2011
Describe
different forms of
potential energy.
 Turn

in 4 bell ringers from the week.
(I won’t be here tomorrow)
Make up test MUST be done TODAY
after school
Turn student release
form into the tray.
November 2, 2011
Define
kinetic energy.
Turn student release
form into the tray.
November 1, 2011
Is
the chemical energy stored
in food the same as the energy
that comes from the Sun or the
energy stored in gasoline?
October 31, 2011
Turn student release
form into the tray.
What
makes a rocket fly
through the air?
Get out Ch. 4 Notes – 7 sections
October 28, 2011
Turn student release
form into the tray.
A
10-kg wagon has a
speed of 25 m/s. What is its
momentum?
 Turn
in 5 bell ringers from this week
October 27, 2011
 Two
Turn student release
form into the tray.
objects that have the same
mass are dropped from a tall
building. One object is larger and
flatter than the other. Explain why
the larger, flatter object hits the
ground last.
October 26, 2011
According
to Newton's second
law of motion, a larger force
acting on an object causes a
greater ________ of the object
October 25, 2011
 Which
of the following would have the
most momentum and therefore cause a
softball to move the most?
A.
B.
C.
D.
Racquetball
Ping Pong Ball
Tennis Ball
Baseball
 Softball
= 180 g
 Baseball = 145 g
 Racquetball = 42 g
 Tennis ball = 57g
October 24, 2011
If 7,650 trucks were sold in 1999, how many
total vehicles were sold in 1999?
A. 35,000
B. 40,000
C. 45,000
D. 50,000
E. 55,000
October 21, 2011
State
 Turn
Newton’s 3rd law.
in 4 bell ringers from this week
October 20, 2011
What
is momentum?
Turn in unused homework
extension passes for 5pts
bonus
October 19, 2011
 No
bell ringer, Mrs. Green absent
October 18, 2011
Describe
projectile motion.
 Tomorrow
is the last day of the 9 week
grading period
Turn in unused homework
extension passes for 5pts
bonus
October 18, 2011
Describe
projectile
motion.
 Tomorrow
is the last
day of the 9 week
grading period
Agenda:
 Turn in 4.1 WKT
 Gravity Hands-on
Activity (Get in
groups of 2-3)
 1.3 Graph WKT
Turn in unused homework
extension passes for 5pts
bonus
October 17, 2011
Explain
the difference between
mass and weight.
October 14, 2011
What
do you think Newton’s 3rd
law is now that you know the
first 2?
 Turn
in 5 bell ringers from this week
October 13, 2011
Calculate
the net
force.
Determine the
acceleration of
the 5 kg object at
the above force.
October 12, 2011
State
Newton’s 1st and 2nd Laws.
October 11, 2011
How
are inertia and mass
related, according to Newton’s
1st law?
October 10, 2011
Tell
me three things you did
over Fall Break. Tell me more
than slept and watched T.V.
Tuesday, Thursday
Period
1
2
3
4
5
6
7
FLEX
Start
8:25
9:15
10:02
10:49
12:08
12:55
1:42
2:29
Stop
9:10
9:57
10:44
12:03
12:50
1:37
2:24
3:00
September 29 & 30, 2011
No
bell ringers as Mrs. Green
was at a conference
September 28, 2011
Can
a penny kill someone if
dropped from the top of a
skyscraper?
 Turn
in 3 bell ringers from this week as I will
not be here Thursday & Friday
September 27, 2011
A
truck travels to and from a
stone quarry that is located 2.5
km to the east.
What is its distance?
What is its displacement?
September 26, 2011
Find
the acceleration of a
car that goes from 32 m/s to
96 m/s in 8.0 s.
September 23, 2011
Explain
what happens if 2
objects have the same speed
but different velocities.
 Turn
in 4 bell ringers from this week
September 22, 2011
Explain
how forces and motion
are related.
September 21, 2011
 No
Bell Ringer, Mrs. Green at a
conference
September 20, 2011
 Create
a graph showing an object
with positive velocity and positive
acceleration.
 Create another line on your graph
to indicate an object with constant
velocity.
September 19, 2011
Starting
from rest, if a car
accelerates at 0.90 m/s2, how
fast would be moving after 6.0
seconds?
Dv
a
t
September 16, 2011
In
yesterday’s acceleration lab,
when did your car have the
fastest acceleration (when on
the low or high incline)?
 Turn
in 5 bell ringers from this week
September 15, 2011
During
a race, a sprinter
increases from 5.0 m/s to 7.5
m/s over a period of
1.25s. What is the sprinter’s
average acceleration?
September 14, 2011
A
dragster in a race accelerated from
stop to 40 m/ s by the time it reached the
finish line. The dragster moved in a straight
line and traveled from the starting line to
the finish line in 10.0 sec.
 What was the acceleration of the
dragster?
September 13, 2011
What
is the equation to
calculate acceleration?
September 12, 2011
If
a car travels 100 meters in 3.2
seconds, what is the average
speed?
September 9, 2011

1st – What is the difference between average speed and average velocity?
4th & 5th – The fastest trains are magnetically
levitated above the rails to avoid friction. The
fastest trains travel about 155 miles in a half
an hour.

What is their average speed in miles/hour?

Turn in 4 bell ringers from this week
September 8, 2011

1st = What is the distance and the displacement of the race car drivers in the Indy 500?
 4th
& 5th = What is the difference between
average speed and average velocity?
September 7, 2011
Check Your Understanding from
yesterday
 What is the displacement of the
cross-country team if they begin at
the school, run 10 miles and finish
back at the school?
September 6, 2011
What
is motion?
September 2, 2011
 No
bell ringer, projector broken
 Turn
in 4 bell ringers from this week
September 1, 2011
 Draw
a bar graph to illustrate the following
information about soccer team wins:






Year
2005
2006
2007
2008
2009
WINS
2
8
4
7
9
August 31, 2011
 On
the graph, what
percentage of fuel
usage is electric
and steam?
August 30, 2011
 Use
the graph in Figure
1-3 to find the number
of grams of sugar that
will dissolve in 100
grams of water at 80ºC.
August 29, 2011
 Arrange
each of the following in order
from largest to smallest.





centimeter
kilometers
meters
micrometers
millimeters
August 26, 2011
 Convert
1750 ml to liters.
 Convert 2 ½ liters to cc's (Cubic
centimeters)
 Turn


in bell ringers from this week
1st & 4th = 4
5th = 3
Page 879 #1-4, 6-10
Math Problems
August 25, 2011
Complete
the following
conversions:
38
cm into meters
459 mL into centiliters
1123 kg in grams
Kelvin = °C +273
°C = Kelvin - 273
cm3 = mL
August 24, 2011
Convert
the following numbers
into scientific notation:
 348594
 0.024094
 0.000004595
 1025
August 23, 2011
 No
bell ringer, Mrs. Green absent
August 22, 2011
How many babies did Dr. Jones deliver
in 1998?
A. 25
B. 35
C. 45
D. 55
E. 65
August 19, 2011
Define
precision and
accuracy.
 Turn
in 5 bell ringers from this week
August 18, 2011
Name
the steps of the
scientific method
Add to yesterday’s bell ringer, just write
the date and the answer. If you were
absent yesterday, write yesterday’s date
and “absent” then answer today’s bell
ringer.
August 17, 2011
What
does Physical
Science cover?
Add to yesterday’s bell ringer, just write
the date and the answer. If you were
absent yesterday, write yesterday’s date
and “absent” then answer today’s bell
ringer.
August 16, 2011
What
are the three main
branches of science?
Add to yesterday’s bell ringer, just write
the date and the answer. If you were
absent yesterday, get out a piece of
paper, put your name on it. Write
yesterday’s date and “absent” then
answer today’s bell ringer.
August 15, 2011
 Get
out a piece of paper, write today’s
date and answer the question below
 Hold on to your paper as we will turn them
in on Friday once we have a week of bell
ringers
What is Physical
Science?