3Test Review Test Review Test 3 = Questions 1,2,11,12,13,14,15,16 8 Total12.5 points a pieceTest 4 = All the other question17 Total5.8 points a piece
4Speed, Velocity, Acceleration “Find Someone Who” can tell you what speed, velocity, and acceleration are.You must locate three different peers to tell you what they think these terms mean and record the answers in the “What we think” row of the document.You are expected to answer as well as ask.It’s OK to be wrong but your must have and answerThe student who answers needs to sign his/her name next to their answer.2 minute time limit per word
5Speed, Velocity, Acceleration Now list an “A” for agree or a “D” for disagree next to the definitionsTurn to your shoulder partner and explain why they agree or disagree with the definitions.You have 2 ½ minutesGO
6Speed, Velocity, Acceleration Update your handouts by recording the scientific definitions of speed, velocity, and acceleration in the “What We Know” row of their handouts.The PowerPoint will instruct you to record examples as they complete their notes on the handout.
7Speed The distance an object travels in a certain amount of time. Average speed – Total distance divided by total timeConstant speed - Speed that does not changeOn your paper, describe an example of an object at a constant speed.
8What is the formula for calculating speed? Speed equals distance divided by time.
9Let’s Practice Calculating Speed On the side of your paper, calculate this problem. Make sure you show all work!A football field is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the football player running?
10Remember to label the UNITS!! Check Your WorkA football field is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the football player running?Speed = Distance ÷ TimeSpeed = 100 m ÷ 20 sSpeed = 5m/sRemember to label the UNITS!!
11Velocity An object’s speed and direction at a given time The wind is blowing 65 km/hr from the North.On your paper, describe an example of velocity.
12AccelerationA change in the direction or speed (velocity) of an object over time – which may be:A change in speedStartingStoppingSpeeding up (positive acceleration)Slowing down (negative acceleration)A change in directionAcceleration is caused by unbalanced forces.On your paper, describe an example of an object accelerating.
13Speed, Velocity, Acceleration How does your “What We Think” section compare to your “What We Know” section?Does anyone notice any differences in the meaning of the three terms? Explain.Speed is distance/time, velocity is speed with a direction, and acceleration is a change in speed and/or direction.
14Speed, Velocity, Acceleration The terms we have noted are extremely important in our upcoming unit of study. Be prepared to refer back to them often.Highlight, circle, or underline the key points
17Calculating and Graphing Speed Title the next blank page Calculating and Graphing SpeedYou are going to draw 5 easy graph and interpret the speed
18Interpret the Graph Below: The graph shows an object which is not moving (at rest).The distance stays the same as time goes by because it is not moving.
19Interpret the Graph Below: The graph shows that the objects distance increases as time passes. The object is moving and so it has velocity.The straight line shows it is a constant (not changing).
20Interpret the Graph Below: Just like the previous graph, this graph shows an object moving with constant velocity.
21Interpret the Graph Below: The curve, in the graph, shows that the object’s velocity is changing as time passes.This is acceleration.
22Interpret the Graph Below: In the first part of the graph, the object is moving with constant velocity.In the second part of the graph, the object is at rest (not moving).In the third part, the object is again moving with constant velocity.
23Calculating and Graphing Speed LAB instructionsEveryone is always recordingGroup Roles (you will rotate jobs)RollerTimer 1Timer 2Timer 3DirectorSays Start and StopIs in Charge
25Calculating and Graphing Speed Continue the labGroup Roles (you will rotate jobs)RollerTimer 1Timer 2Timer 3DirectorWhen you are finished sit back at your desk and complete the graph and the questionsWork togetherTurn in when you are finishedUse COLOR on the graph
26Warm Up Directions: 1. Read the following scenario. 2. Calculate the average speed.3. Briefly describe all points of acceleration and explain.A female cheetah left her cubs to hunt for food. She sprinted 30 m away from her den in two seconds. Next, she turned around and traveled 10 meters back toward her den in three seconds. She suddenly stopped and listened intently for two seconds. Then, she traveled 40 meters away from her den in four seconds.
27Card SortWith your face partner, sort the cards into 3 groups
28Story GraphsWith your groups, write a 10 sentence story using 2 of the four graphs.Your story must include:The average speedAccelerationMain CharacterPlotBe creative10 picturesUse two iPadBe prepared to share
29Warm Up Write Tug of War on your warm up Open Tug of War Handout in eBackpack
31Change the Motion of an Object Open Change the Motion of an Object in ebackpackYou will answer the questions ON THE FIRST PAGE as you complete the labUsing the object that I give you make it accelerate AT YOUR DESK!!!!!!!!!!!Make it stop, start, speed up, slow down, and change direction
33Change the Motion of an Object With your should partner look at the handout.Describe the motion of the object.Such as: left, right, up, downThen explain to your partner why your think the object will move in a certain direction.Use words like: balanced, unbalanced, force, motion and acceleration
34Notes Volunteer to share Now you are going to start filling out the rest of the paper from ebackpackCopy what is in yellow and include a quick picture
35Motion A change in the position of an object Caused by force (a push or pull)
36Force A push or pull on an object Measured in units called newtons (N) Measured with a spring scaleForces act in pairsTypes of Force: (pick two)gravityelectricmagneticfrictioncentripetal
37Balanced ForcesWhen all the forces acting on an object are equal (net force is zero)Balanced forces do not cause a change in motion.Balanced forces can change the physical properties of an object without changing its motion.In your notes, describe an example of a balanced force.
38How Can Balanced Forces Affect Objects? Cause the shape of an object to change without changing its motionCause an object at rest to stay at rest or an object in motion to stay in motion (inertia)Cause an object moving at a constant speed to continue at a constant speedIn your notes, describe an example of a balanced force affecting an object.
39InertiaAn object at rest will remain at rest until acted upon by an unbalanced force.An object in motion will remain in motion until acted upon by an unbalanced force.When all forces acting on an object are equal (balanced)
40Unbalanced ForcesWhen all the forces acting on an object are not equalThe forces can be in the same direction or in opposite directions.Unbalanced forces cause a change in motion.In your notes, describe an example of an unbalanced force.
41How Can Unbalanced Forces Affect Objects? Acceleration is caused by unbalanced forces:slow downspeed upstopstartchange directionchange shapeIn your notes, describe an example of an unbalanced force affecting an object.
42Net Force The total of all forces acting on an object: Forces in the same direction are added.The object will move in the direction of the force.Forces in opposite directions are subtracted.An object will move in the direction of the greater force.Balanced forces do not cause a change in motion.
44Open your notes from yesterday and prepare to finish taking notes Copy what is in YELLOW and include a quick picture
45Calculating Net Force 110 N30 NA child was playing with a jack in the box. The lid pushed down with 10 N of force, while the spring pushed up with 30 N of force. What is the net force applied by the spring?In your notes, calculate the net force and show all of your work.
46Check Your Answer10 N30 NA child was playing with a jack in the box. The lid pushed down with 10 N of force, while the spring pushed up with 30 N of force. What is the net force applied by the spring?30 N to the right N to the right = 40 N to the right
47Calculating Net Force 2 Two competitors are playing tug of war. Tug of War Game30 N50 NTwo competitors are playing tug of war.What is the net force? Which direction will the rope move?In your note, calculate the net force and show all of your work.
48Check Your Answer Two competitors are playing tug of war. Tug of War Game50 N30 NTwo competitors are playing tug of war.What is the net force? Which direction will the rope move?50 N to the right – 30 N to the left = 20 N to the right
49Force Arrows Open the Data Sheet in ebackpack You are completing the first half of the first pageYou have 5 minutes to rotate around the room and find three DIFFERENT partners. You will combine arrows. You decide which direction you want them to turn. Fill in the chart
50Mass and Weight Mass is the amount of stuff (matter) in an object. The mass of an object will remain the same anywhere in the universe.Mass is measured in grams or kilograms.
51Mass and WeightWeight is the mass (kg) of an object multiplied by the acceleration of gravity (9.8 m/s2).The weight of an object depends on the gravitational pull of the location in the universe.The gravitational pull on the Moon is only 1/6 of Earth’s gravitational pull.Weight is measured in newtons (N).
52Mass and WeightExample: F=ma A person with a mass of 25 kg x 9.8 m/s2 gravitational acceleration is equal to 245 N of weight force. F= 25 kg x 9.8 m/s2 F = 245 N The person exerts 245 N of force on the ground. If the person went to the Moon, they would only weigh 1/6 of 245 N.
53ForceForce (N) = mass (kg) x acceleration (m/s2)F÷m x a
54ForceAcceleration (m/s2) = force (N) ÷ mass (kg)F÷m x a
55ForceMass (kg) = force (N) ÷ acceleration (m/s2)F÷m x a
56PracticeThe acceleration of a sprinter is 10 m/s2. The force exerted on the starting blocks is 650 N. What is the mass of the sprinter? Force = Mass = Acceleration =
57Check Your AnswerThe acceleration of a sprinter is 10 m/s2. The force exerted on the starting blocks is 650 N. What is the mass of the sprinter? Force = 650 N Mass = 65 kg Acceleration = 10 m/s2 Mass = force ÷ acceleration Mass = 650 ÷ 10 Mass = 65
58PracticeA 56 kg cart is accelerating at 15 m/s2. Calculate the force exerted on the cart?Force =Mass =Acceleration =
59Check Your AnswerA 56 kg cart is accelerating at 15 m/s2. Calculate the force exerted on the cart?Force = 840 NMass = 56 kgAcceleration = 15 m/s2Force (N) = mass (kg) x acceleration (m/s2)Force = 56 x 15Force = 840
60PracticeA boat is pulling a 54 kg wake boarder. She accelerates at 2 m/s2. Calculate the force that is causing the acceleration.Force =Mass =Acceleration =
61Check Your AnswerA boat is pulling a 54 kg wake boarder. The force the boat is exerting on her is 108 N. Calculate her acceleration.Force = 108 NMass = 54 kgAcceleration = 2 m/s2Acceleration = force ÷ massAcceleration = 108 ÷ 54Acceleration = 2
62Force Mass and Acceleration Cards Open the Data Sheet againYou are completing the second half of the first pageYou have 5 minutes to rotate around the room and find three DIFFERENT groups of three.Each group must have a Force, Mass, and Acceleration card
63Force Mass and Acceleration Cards The remaining two pages are homework due tomorrow.You may spend the rest of the period working on them
64Warm UpA boat is pulling a 54 kg wake boarder. She accelerates at 2 m/s2. Calculate the force that is causing the acceleration.Force =Mass =Acceleration =
66Review The total of all forces acting on an object: Forces in the same direction are added.The object will move in the direction of the force.Forces in opposite directions are subtracted.An object will move in the direction of the greater force.
67Review Unbalanced forces cause a change in motion. Balanced forces do not cause a change in motion.
68Warm Up What is Force measured in? What is acceleration measured in? Newtons (N)What is acceleration measured in?D/TSuch as:m/s, miles/hour, ectWhat is mass measured in?WeightLbs, kg, ect
69Effects of Unbalanced Forces Lab Remember Your Lab Safety RulesYou must show an understanding of speed, velocity, and acceleration.This is a Test Grade!Call me over when you get to the graphing part
70Warm UpTurn in your Effects of Unbalanced Forces Experiment right now even if you are not finishedWrite test on your warm up logTurn in your warm up logStudy your notes and labs for the next ten minutes