Transcript Stoll MYP Physics WS 2-2-15

Work and Power
2/2/15
2/2
2/3
2/4
2/5
2/6
No School
Get-Er- Done – Work
TB: 436-438 Work WB: p. 97
Work WB: p. 97-98
HW: Read TB p 439-442 answer Checking
up questions #1-2
Work- WB: p. 99-101 Video
HW: Read TB p 439-442 answer Checking
up questions #3-5
Work TB: p.439- 442 CN/ Quiz
Date: 2/3
Goal: I can investigate the
relationship between the force required
to pull a cart up a ramp and the distance
along the track the cart moves to a
specific height.
Bell Ringer: Does it take more energy
to walk up a steep hill or a gentle
hill, if you go to the same height
?Why ?
2/3
Today’s Activity
1. Text book page 436-438
2. Write data in Workbook p. 97
Partner 1 Pulls cart and measures the force
Partner 2 measures height and changes ramp
Partner 3 writes results in table
Partner 4 reads direction
All students must write results in their tables
2/3
Today’s Activity
1. Text book page 436-438
Bell Ringer 2/4
Interpretation of Data (IOD)
The relationship between an applied force and the resulting acceleration of a cart carrying different
masses is studied. (See Figure 1.) The cart moves from A to B, and distance and time
measurements are made. Laboratory weights are used for the applied force. The surface over
which the cart travels is level and nearly frictionless. A timer that makes a mark every .1 second is
attached to the underside of the cart. The marks are recorded on a strip of paper that lies flat on the
surface over which the cart travels. The timer starts simultaneously with the release of the cart. The
marks on the paper are measured, and the distance from Point A is recorded. The distances
represent the location of the cart after each .1 second interval. Velocity was calculated at each data
point.
Average acceleration was calculated by
dividing the change in velocity for each
interval by the length of time of each interval.
The measured and calculated data are given
in Table 1.
1. If data had been collected for a fifth data point in Trial 1, what would the velocity have been?
A. 0.80 m/s
B. 1.00 m/s
C. 1.20 m/s
D. 1.40 m/s
Date: 2/4 Goal: I can analyze and graph the
relationship between the force required to pull a cart
up a ramp and the distance along the track the cart
moves to a specific height.
WB p. 97 Data
What is the relationship between the
distance up a ramp and the force
required to move the cart to a
specific height?
Date: 2/4 Goal: I can analyze and graph the
relationship between the force required to pull a cart
up a ramp and the distance along the track the cart
moves to a specific height.
Data
Trial
Force (N)
Distance (m)
Fxd
1
1.5 N
.90m
1.35
2
1.7 N
.80m
1.35
3
2.0 N
.67m
1.35
4
2.7 N
.50 m
1.35
Date: 2/4
Goal: I can analyze and graph the relationship
between the force required to pull a cart up a ramp and the
distance along the track the cart moves to a specific height.
Data Analysis
Trial
Force (N)
Distance (m)
Fxd
1
1.5 N
.90m
1.35
2
1.7 N
.80m
1.35
3
2.0 N
.67m
1.35
4
2.7 N
.50 m
1.35
Date: 2/4
Goal: I can analyze and graph the
relationship between the force required to pull a
cart up a ramp and the distance along the track the
cart moves to a specific height.
Graph Data on WB p. 98
-Label the axis
-Number the axis (Use most of the graph)
-Plot your data and Mr. Stoll’s data
-Create a best fit line
Date: 2/4
Goal: I can analyze and graph the relationship
between the force required to pull a cart up a ramp and the
distance along the track the cart moves to a specific height.
Graph
Distance vs Force
3
2.5
Force (N)
2
1.5
1
0.5
0
0
0.1
0.2
0.3
0.4
0.5
Distance (m)
0.6
0.7
0.8
0.9
1
Date: 2/4
Goal: I can analyze and graph the relationship
between the force required to pull a cart up a ramp and the
distance along the track the cart moves to a specific height.
1. Graph Data on WB p. 98
2. Write claim and evidence WB p. 98
3. Conclusion WB p. 99
Date: 2/4
Goal: I can analyze and graph the relationship
between the force required to pull a cart up a ramp and the
distance along the track the cart moves to a specific height.
1. Complete “What I think it means”
on WB p. 101
2/4
Today’s Activity
Claim-Evidence-Reasoning
Claim: A statement about a solution to a
problem
Evidence: Scientific data that supports the
claim
Reasoning: Justification (which means you have
to back it up) that shows why the data counts
as evidence which supports the claim
Example
Claim: Plants need sun to grow
Evidence: Plants planted in the shade
grow smaller and slower than those
in the sun, plants in a closet die.
Reasoning: since plants kept away from
sun die and those grow in low light
grow slower than those in high light
light is necessary for plant growth.
Bell Ringer: Which of the following graphs best illustrates the
relationship between heat released by foods in table 1 and the
change in temperature?
7. If data had been collected for a fifth data point in Trial 1, what would the velocity have been?
A. 0.80 m/s
B. 1.00 m/s
C. 1.20 m/s
D. 1.40 m/s
8. If the 3 trials could be run simultaneously on parallel setups, in what order, from first to last, would the carts get to Point B ?
F. Trial 1, Trial 2, Trial 3
G. Trial 1, Trial 3, Trial 2
H. Trial 2, Trial 1, Trial 3
J. Trial 3, Trial 2, Trial 1
9. Mass is added to the cart by the addition of a wooden block that rests on top of it. When the force is increased to 4.0 newtons,
the block falls off as the cart begins to accelerate. Why does it fall off when the force is increased to this level?
A. The force accelerating the cart becomes large enough so that the force of friction holding the block on is overcome.
B. The force of friction holding the block in place becomes large enough to overcome the force accelerating the cart.
C. The mass of the cart becomes too large, and the load must be reduced for the cart to accelerate.
D. The acceleration becomes nonuniform with this force.
10. Another experiment showed the velocities for a trial to be 1.0 m/s, 2.5 m/s, 4.5 m/s, and 7.0 m/s when measured in the same
way. What trend occurred in the average acceleration?
F. It was constant.
G. It decreased by 10.0 m/s2 each interval.
H. It decreased by 5.0 m/s2 each interval.
J. It increased by 5.0 m/s2 each interval.
11. If Trial 3 were redone with a force of 1.0 newton, then compared to that found in Trial 3, the average acceleration would be:
A. initially lower and decreasing.
B. initially lower and constant.
C. the same.
D. initially higher but decreasing.
Date: 2/5
Goal: I can understand work
and determine if work has been done.
Bell Ringer: Answer questions 8-11
from Passage II
5 min
Date: 2/5
Goal: I can understand work
and determine if work has been done.
Complete WB p 101
“What Do I Think”
Date: 2/5
Goal: I can understand work
and determine if work has been done.
Independently read TB p. 439-442
Take cornell notes
Title: Textbook p. 439
12 min
Date: 2/5
Goal: I can understand work
and determine if work has been done.
Independently read TB p. 439-442
Take cornell notes
Title: Textbook p. 439
12 min
Date: 2/5
Goal: I can understand work
and determine if work has been done.
Video
Date:2/6/15
Goal: I can calculate work.
Bell Ringer: 1. If a girl lifts 6N book 3 meters, what
is the work done by the girl? W= F (d)
2. What path will the car do the most work and use
the most energy? Why ?
AD, BD, CD, all paths
Which does the most work?
A
B
C
http://www.physicsclassroom.com/mmedia/ene
rgy/au.cfm
Date:2/6/15
Goal: I can calculate work.
Independently complete WB page 101
“New Information”
3 min
Date:2/6/15
Goal: I can calculate work.
With your shoulder partner complete TB p.445
Essential Questions in your NB.
Title it Essential Questions p 445
10 min
Due today
In your Notebook
Session 197877
TB p. 439-442 CN
Denied press menu
TB p. 442 #1-5
Enter ID #
TB p. 445 Essential Questions
WB: p. 97, 98, 99, 101
Write your name on all work