Tuesday, November 12, 2013

H Physics Standards: 1d Students now that when one object exerts a force on a second object, the second object always exerts a force of equal magnitude and in the opposite direction (N’s 3rd Law)WHST.9-12.2  Write informative/explanatory texts, including the narration of historical events, scientific procedures/ experiments, or technical processes. (HS-PS2-6)

Agenda:1. Warm Up2. Review Force Meters3. Begin Tug of War

Homework

Warm UpWhen a 100N weight is placed on a Force meter, the spring stretches 10 cm, what is the

spring constant k?

F=-kx to find the answer

Wednesday, November 13, 2013

H Physics

Warm UpIf a giant kicks Jack from the

beanstalk with a Force of 10,000 N, how much Force did Jack apply to the giant

when the giant’s foot made contact with Jack’s body?

HomeworkP.4 Day 1 Graphing Skills

Standards: REVIEW of Kinematics For Test Retake

Learning Objective: SWBAT know the entire process for graphing data.

Agenda: 1. Warm Up2. Correct #F53. Finish N’s 3rd Law Lab4. Day 1 Graphing Skills

Thursday, November 14, 2013

H Physics

HomeworkDay 1 Graphing Skills P.2Day 2 Problem Solving P.4

Warm UpA car is moving at a

constant speed. Draw the scenario and identify at least

2 Force Pairs acting on the car.

Standards: 1a -- Review for Kinematics ReTest

Learning Objective: SWBAT finish building a force meter

Agenda1. Warm Up2. Review Tug of War Lab3. Review Day 1 Graphing4. Kinematics BootCamp

Friday , November 8, 2013

H Physics

HomeworkFinish Problem Solving Worksheet

Warm UpGraph and find the equation of the line

Standards:  1a Review of KinematicsLearning Objective: SWBAT do Kinematics Problem Solving

Agenda: 1. Warm Up2. P.2 Review Graphing3. P.2 Begin Problem Solving4. P.4 Problem Solving Review5. P.4 Take Exam

t(s) v(m/s)

0 4

2 9

4 14

6 20

8 26

9 30

Symbols, units and equations Study Guide

Equations:

Constant Velocity

Constant Acceleration

1.

2.

The Two equations of Motion The Two equations of Motion for Falling Objects

ag=-9.8m/s2

Forces

Symbol Units

t s

v m/s

a m/s2

F kgm/s2 or N

Δx m

Types of Forces• From your book p. 94 Table 4-2

Force Symbol Definition Direction

Friction Ff Resistive Force. Comes from rubbing against or sliding across surfaces.

Parallel to the surface and opposite the direction of sliding

Normal FN The force exerted on an object by the ground, a table, a platform, or any surface.

Perpendicular to and away from the surface.

Spring Fsp Restoring Force. The push or pull a spring exerts on an object.

Opposite the displacements of the object at the end of the spring.

Tension FT The pull exerted by a string, rope, or cable when attached to something.

Away from the object and parallel to the string, rope, or cable at the pont of attachment.

Thrust, Applied Force Fthrust,Fap A general term for the forces that move objects such as rockets, planes, cars and people.

In the same direction as the acceleration of the object.

Weight Fg Attractive Force of two objects due to gravity. Usually Earth and and object

Straight down towards the center of the earth.

Air Resistance/Drag FAR Resistive Force, comes from air/wind hitting moving objects

Opposite of Motion

N’s 3rd Law: Tug-of-

War

• Figures 6 (a) and (b): A student and a partner each pull on the opposing force-meters and observe that they show the same reading. In the second scenario, one student holds his force-meter still, while the partner pulls his force meter to the right.

• Figures 7 (a) and (b): Students predict the reading on the force meter in each of the two scenarios depicted prior to testing.• Engage• What will happen to the motion of each chair when one of the students on the rolling chair pushes the other student on the chair.

Will it matter which student pushes? Justify your answer. Tell me your reasoning. • Explore• Students attach their force-meters with rubber bands or string and record…

o the reading on each force-meter when both students pull (Figure 6 a.)o the reading on each force-meter when one student keeps his force-meter stationary while the other student pulls (Figure 6 b.)

• Explain• Newton’s 3rd Law mini-lecture• Elaborate• Recreate the Figures 7(a) and (b). Write predictions for the force-meter readings for each of the two scenarios in Figure 7 . • Next, test your predictions, discuss your results in a group and be ready to participate in a discussion about these results. • Evaluate• Newton’s 3rd Law Assignment: #F5 Due Monday

To get a Full 10 pts. complete every section with questions. That does not include the explain section (which is lecture) or the Evaluate Section (I will grade this section separately) Write on a separate sheet.

Newton’s 3rd Law Notes

Newton’s 3rd Law:Definition: For every action (Force) there is an equal and opposite reaction (opposing Force)

Equation

Where FBA is the Force of B on Aand FAB is the Force of A on B

Example1.An object on a table is pushing down on the table because of gravity and the table is pushing up on it with normal force.2. The Force of gravity occurs when there are 2 masses, each of them pulling on each other with an equal and opposite force.3. Friction and a Car’s tires.

Non-ExampleTrying to move from one point to another in space by waving your arms and legs furiously.

1. Using your Engage Experience, define Newton’s 3rd Law - 3 minutes.2. Discussion - 2 minutes

B A

FBA FAB

FBA = -FAB

Notes 5 mins

#F5

Modeling the Graphing Process

Step One – label each axis with the symbol and the units being represented by the graph.

1st column x-axis, 2nd column y axisStep Two – Create your x and y axis scales. To create a scale(your numbering system on the graph) look at your smallest and largest data points. Then pick a number sequence (ex. 1,2,3,4 or 2,4,6,8) that will allow all of the points to fit on your graph. Step Three – Plot the Points. Step Four – Make a best fine line. It has to be straight and you need to make it go through the center or through the average of your points. See board for more explanation.Step Five – Find the slope of the graph. Step Six (Honors Only) – Find the equation of the graph by substituting your data into the formula y=mx+b