February 22/23, Week # 7 NB-118 Learning Target: I will Define force and identify the correct units. Identify the types of friction
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1 February 22/23, Week # 7 NB-118 Learning Target: I will Define force and identify the correct units. Identify the types of friction Homework: Experiment Design Essential Question: Why is friction a force? Agenda: Check HW (NB-115) Word wall Forces and friction notes Start homework TO DO NOW: Turn in late hw Look at the word wall. Do you recognize any of the words?
2 Difficult Vs. Easy Topics Most students thought the speed and velocity problems were easier because of all of the practice. Most of these students thought the graphs were the most difficult. Those students who thought the problems were the most difficult, usually thought the graphs were the easiest.
3 Student Preparation Study more With a partner Reviewing notes/notebook Pay attention in class Complete all of the homework Complete the notebook
4 Teacher Preparation: What you want Study guide (see learning targets, NB-98) Practice quiz (I don t get the test early) Textbook activities Labs Whiteboard reviews Jeopardy game More examples Slower speech
5 HW: Page 273 #1-3, Name three situations in which force is created. Describe the cause of the force in each situation. 2. Which of the following are units of force? Muscles create force swinging a racket Wind creates a force Massive objects (like planets) create a force called gravity b. Newtons and pounds
6 HW: Page 273 #1-3, Which is greater: a force of 10 N or a force of 5 lbs? 7. Name three devices or inventions which are designed to decrease friction. 8. Name three devices or inventions which are designed to increase friction. 1 pound= N, so 10 N ~ 2 lbs 5 lbs ~ 20 N Therefore, 5 lbs is bigger than 10 N Decrease friction: lubricants, ball bearings, magnetic levitation Increase friction: tires, nails, cleated shoes
7 HW: Page 273 #1-3, If the force squeezing two surfaces together is decreased, the force of friction between the two surfaces will most likely: Think of pushing on a desk. If you push less (less force), there will be less friction
8 HW: Page 273 #1-3, An astronaut in a space suit has a mass of 100 kilograms. What is the weight of this astronaut on surface of the moon where the strength of gravity is approximately 1/6 that of Earth? If you weigh 60 kg on earth, you would weigh 10 kg on the moon. Therefore, you divide 100 by 6 and get 16.7 kg on the moon.
9 Word Wall What words do you recognize? Talk to your partner. Did you both recognize some of the same words?
10 Glue these pages and add to table of contents: Weekly Planner #7 HW: page 273 Sample Experiment NB-118 NB-120 NB-121 Label NB-119: Forces Cornell Notes
11 Forces Cornell Notes, NB-119 Question What is a force? Answer A force is a push or pull, or any action that has the ability to change motion.
12 Forces Cornell Notes, NB-119 Answer: The four elementary forces are strong nuclear force, electromagnetic force, weak force, and gravity.
13 13.1 Units of force When you measure weight in pounds on a scale, you are measuring the force of gravity acting on the object. The word pound comes from the Latin word pondus, which means weight.
14 Forces Cornell Notes, NB-119 Questions Answers Force is measured in the units of pounds and newtons One pound of force equals newtons.
15 Think, ink, pair, share What are four types of forces? How is force measured? Which is a greater force: a pound or a newton?
16 Forces Cornell Notes, NB-119 Questions Answers Friction is a force that resists the motion of objects or surfaces.
17 Essential Question: Friction is a force that resists the motion of objects or surfaces. Essential Question: How is friction a force? Remember: A force is a push or pull, or any action that has the ability to change motion.
18 Forces Cornell Notes, NB-119 Friction depends on both of the surfaces in contact. When the hockey puck slides on ice, a thin layer of water between the rubber and the ice allows the puck to slide easily.
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20 Forces Cornell Notes, NB-119 Question Answer Five types of friction are static, sliding, rolling, air and viscous
21 Design an experiment (HW) Step 1: Think of different types of surfaces to test for the most/least friction: carpet, tile, wax paper, wood, cement, etc. Step 2: Decide if you want to test rolling, static, or sliding friction.
22 Step 3: Design an experiment (HW) Decide what should be used to test the friction (marble, soup can, car, box, etc) Step 4: Create a problem/question that best describes your experiment. Which surface will create the most static friction on a box? Which surface will create the least rolling friction on a marble?
23 Step 5: Design an experiment (HW) Create a hypothesis for your experiment If aluminum is used then the rolling friction will be decreased on the marble. If carpet is used then the sliding friction will be increased on the box. Step 6: Fill in the lab handout front page
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