Bellringer: 9/12/2016 Write your STOTD in your notebook. You will need the following items: 4 Color pencils Ruler Calculator

Map your Classes! Directions: You will have 10 minutes to do the following: On your map: Label your 1st ,2nd, 3rd, and 4th period classes using a different color for each class. Using a ruler, measure the distance of the route your take from each class in centimeters

Motion, Forces, Work, and Power Chapters 11 and 12

Meter/Second2 (m/s2 or m/s/s) Concept Symbol Units Distance d Meter (m) Time t Second (s) Speed v Meter/Second (m/s) Velocity Acceleration a Meter/Second2 (m/s2 or m/s/s) Gravity g Force F Newton (N) Weight Fg Mass m Kilogram (kg) Work W Joule (J) Power P Watt (W) end

Motion Motion A change in position Motion is Relative Example: Depends on the “Frame of Reference” Example: You and a friend are riding in the car (55 mph) When you look at your friend, is he moving? Nope, he is sitting still A person on the sidewalk sees both of you, moving at 55 mph end

Motion Distance Total distance = 6 Total distance = 6 Length of the path between 2 points Add up EVERY step you take Total distance = 6 Total distance = 6 end The SI unit is meters (m)

Motion Displacement Straight line length between the start and finish The path does not matter!! Total displacement = 6 Total displacement = 2 end

Motion BUT, they both have the same displacement Finish Start Alan traveled more distance end

Motion Eva’s distance? 150 m Eva’s displacement? 50 m end

Back to your school map! Calculate the total distance you travel during your school day. Calculate the average distance you travel between classes Which class change requires you to travel the greatest distance How can you shorten the route during your longest transition?

Graphic Organizer! Let’s compare distance and displacement!

Back to your school map! Calculate the displacement between each class. What is your total displacement? What is your average displacement? Compare your distance vs displacement data. Will the displacement values be larger than distance values?

Motion Speed How fast an object is moving The SI unit is meters per second: (m/s) end

Motion Velocity How fast an object is moving and its direction The SI Unit is meters per second : (m/s) The SI unit is Change in position “Δ” stands for change = Ending – Starting Change in time end

Motion Complete #1-5 on “ Determining Speed (Velocity)

**Don’t forget to write the units in your final answer! Bellringer: 9/13/16 **Don’t forget to write the units in your final answer! What is the speed of a car that has traveled 3050 m in 400 s? What distance was covered if a car moving at 20 m/s travels for 500 s? STOTD end

Motion 2 types of graphs to know: Distance vs. Time Velocity vs. Time end

Speed/Velocity Graph Distance vs. Time x-axis = time y-axis = distance Slope = Speed/Velocity Flat Line = Not Moving Straight Line = Moving at Constant Velocity Curved Line = Accelerating end

Motion What is the object’s speed from 0 to 8 s? What is the speed between 8 and 12 s? What is the speed between 12 and 20 s? end

end

Practice in Packet!!! Graphing Distance vs Time pg 19 Calculating Average Speed pg 16

Bellringer: 9/10/15 What is the speed at t=0.5s? What can you tell about the object from the slope of the line? STOTD

Motion Acceleration How fast an object: Gains/Loses Speed or Changes Direction The SI Unit is meters per second squared: (m/s2) Starting Velocity Ending Velocity end

Motion A car accelerates from 20 m/s to 60 m/s in 10 seconds. What is the car’s acceleration? A ball moving at 18 m/s is accelerated at a rate of 3 m/s2 for 2 seconds. What is the final velocity? A baseball is hit by a batter and accelerates from 0 m/s to 30 m/s in 0.03 seconds. What is the acceleration? end

Get out your packet! Complete #1-5 on “Acceleration Calculations” pg 17 in Packet # 6-9 are for Homework!

x-axis = time y-axis = speed Motion Velocity vs. Time x-axis = time y-axis = speed Slope = Acceleration Flat Line = Moving at Constant Velocity Line is going up = Increasing Velocity Line is going down = Decreasing Velocity end

Graphing Practice in Packet! Graphing Speed vs Time pg 18

Bellringer: 9/15/2016 What is the formula for speed? What is the formula for acceleration? How are distance and displacement different? STOTD **Turn in COMPLETED airplane lab **QUIZ on Friday **Have HW out

Chapter 12 Forces and Motion

Chapter 12: Forces Force (F) Net Force A push or pull that acts on an object Causes an object to accelerate Measured in Newtons (N): the force that causes a 1 kg mass to move at 1 m/s2 Shown with an arrow Big Force = Big Arrow! Can be combined Net Force Overall force on object, after adding all forces together end

Forces Balanced Forces Forces cancel each other out Net Force = 0 No change in motion 6N 6N = Object stays the same end

Forces Unbalanced Forces Forces do NOT cancel Object accelerates in the direction of the larger force 6N 3N 3N = Object Accelerates end

Forces Friction Force that opposes an object’s motion Keeps it still or slows it down Object stays the same 6N 6N Static Friction Push = Object Accelerates 2N 6N Sliding Friction Push = 4N end

Types of Friction Static Friction Sliding Friction Rolling Friction A book resting on a table… it’s not going anywhere!! Sliding Friction A box being pushed on the floor… it’s sliding! Rolling Friction A ball rolling across the floor… it’s rolling! Fluid Friction A boat moving through a river (Fluid is the river) An object in free-fall (fluid is the air)

Forces Earth’s acceleration due to gravity is 9.8 m/s/s Gravity Force that pulls any 2 objects together Earth’s acceleration due to gravity is 9.8 m/s/s end

Forces Projectile Motion Falling object that is moving forward Objects move in a curved path end

Chapter 11 and 12 vocab!! Complete Vocab words found on the front of your packet on a separate paper OR on the pack page of packet: #1-10 #21-25

Motion and Forces Isaac Newton Created the “Three Laws of Motion” They have held up for more than 300 years end

2. STOTD **QUIZ TODAY Bellringer: 9/16/2016 Make a KWL chart about Motion. K stands for what you know. W stands for what you want to know. The L stands for what you have learned K W L 2. STOTD **QUIZ TODAY

Bellringer: 9/19/2016 Dan drove a car 5000 meters in 800 seconds. What was Dan’s average speed? A car traveling at 50 m/s slows down at a constant rate for 47 seconds until it stops. What is the acceleration? STOTD **TEST ON THURSDAY 9/22/2016

Motion and Forces Newton’s 1st Law of Motion Inertia An object at rest will stay at rest, unless acted upon An object in motion will stay in motion, unless acted upon Also called the “Law of Inertia” Inertia Objects do NOT want to change their motion end

Motion and Forces Newton’s 2nd Law of Motion An object will accelerate when a force is applied Units: Force=Newtons, a=m/s/s, m=kg end

Motion and Forces A 15.0 kg mass is pulled along by a force of 100 N. What the object’s acceleration? A 4.5 kg mass is accelerated at 40 m/s2 what is the force that was applied? If the same force was applied to a 18 kg object, what would be its acceleration? A car is accelerated at 30 m/s2 by a force of 1550 N. What is the mass of the car? end

Motion and Forces Weight g = 9.8 m/s/s The force of gravity on an object Part of Newton’s 2nd Law!!! Units: Newtons g = 9.8 m/s/s end

Motion and Forces a) A man has a mass of 88 kg. What is his weight on Earth? b) If he weighs 141 N on the moon, what is the acceleration due to the moon’s gravity? What is an object’s mass, if it weighs 534 N on Earth? end

Motion and Forces Newton’s 3rd Law of Motion For every action there is an equal and opposite reaction These forces DO NOT cancel each other out ForceA on B = —ForceB on A The ball pushes back with -12 N He is pushing the ball with 12 N B A end

Bellringer: 9/20/2016 A car is accelerated at 30 m/s2 by a force of 1550 N. What is the mass of the car? What is an object’s mass, if it weighs 534 N on Earth? STOTD **TEST on Thursday **Packet Due Thursday!! **Reminder to Mrs. Shaw:Wednesday Schedule**

Chapter 14 Work and Power

Work Work The result of a Force moving an Object NO Movement = NO Work!!! Movement and Force must be in the same direction Carrying an Object = NO WORK!!! units: Joule (J) end

Work A force of 825 N is needed to push a car. Two students push the car 35 m. How much work is done? A hot-air balloon weighs a total of 8000 N. If the balloon rises to a height of 1000 m how much work was done? A man lifts a 15 N box 1.2 m into the air. How much work did he do? A 10 kg box is pushed 13 m across the floor at an acceleration of 3 m/s2. How much work was done to move the box? end

Work Work is never 100% efficient You put MORE energy in, than you get out Because of FRICTION!!! Like a car engine Efficiency: the amount of work input that becomes work output Work you get out end Work you put in

Power Power The Rate of doing Work Horsepower (hp) 1 hp = 746 watts Units: Watt (W) end

Power A woman does 3400 J of work over a period of 50 s. How much power did she use? A rocket is shot upward with a force of 2 N. It reached an altitude of 1200m in 30 s. How much power was in the rocket? end