Work and Power2/2/15

2/2 No School2/3 Get-Er- Done – Work

TB: 436-438 Work WB: p. 972/4 Work WB: p. 97-98

HW: Read TB p 439-442 answer Checking up questions #1-2

2/5 Work- WB: p. 99-101 VideoHW: Read TB p 439-442 answer Checking up questions #3-5

2/6 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 ?

2/3Today’s Activity

1. Text book page 436-4382. Write data in Workbook p. 97

Partner 1 Pulls cart and measures the forcePartner 2 measures height and changes ramp

Partner 3 writes results in tablePartner 4 reads direction

All students must write results in their tables

2/3Today’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 givenin 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 DataWhat 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.

DataTrial Force (N) Distance (m) F x d

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 AnalysisTrial Force (N) Distance (m) F x d

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

Graph

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. 982. 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

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.

2/4Today’s Activity

Claim-Evidence-ReasoningClaim: A statement about a solution to a

problemEvidence: Scientific data that supports the

claimReasoning: 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 growEvidence: 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. 439-442Take cornell notesTitle: Textbook p. 439

12 min

Date: 2/5 Goal: I can understand work and determine if work has been done.

Independently read TB p. 439-442Take cornell notesTitle: 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?

http://www.physicsclassroom.com/mmedia/energy/au.cfm

A B C

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 todayIn your Notebook Session 197877TB p. 439-442 CN Denied press menuTB p. 442 #1-5 Enter ID #TB p. 445 Essential Questions

WB: p. 97, 98, 99, 101Write your name on all work