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Interactive Video Script Template Course Science 7 Lesson Objective Semester A Unit 5 Lesson 2 2.a. Students will define the terms velocity and displacement. 2.b. Students will describe how unbalanced forces acting on an object change its velocity. CLIP A (Introduction) Visual <Image> <Fly image in from left, when audio is done, fly image off towards right> Audio Objects are in motion all of the time. But how do we describe this motion? http://pixabay.com/en/bicycle-bike-bikingsport-cycle-384566/ <image> Some common words that come to mind are fast…slow…up…down. http://pixabay.com/en/rocket-launchrocket-take-off-nasa-67643/ <Image> <Show in a list> We can summarize fast, slow, up and down into one word: Velocity. Fast Slow Up Down <fade list out, and fade/dissolve in the word velocity as the narrator says it> <image> VELOCITY <Show images side by side> <image> http://pixabay.com/en/gauge-kilometersmiles-speed-152570/ <image> http://pixabay.com/en/compass-eastnorth-south-west-152121/ Velocity describes the speed and direction of an object. <image> A train’s motion can be described using velocity. Its velocity could be sixty miles per hour, East. But, think about this… Could its motion be described by displacement? http://pixabay.com/en/locomotive-steamlocomotive-train-222174/ <image> Yes! Displacement is the difference in an object’s position. http://www.morguefile.com/archive/display /860388 <image> Think to yourself… can you combine both velocity and displacement to describe the motion of the leaves during fall? http://pixabay.com/en/autumn-avenuetrees-548886/ <image> http://pixabay.com/en/yes-consent-hookcheck-mark-board-238378/ If you said ‘yes’, you are correct! Today we will explore both velocity and displacement, along with how forces affect an object’s velocity. Now, let’s see what you already know about velocity. Question A Stem: Which answer best describes a football’s velocity? Answer Choices: A. B. C. D. The quarterback threw the football fast! The receiver caught the football while running down the field. The referee caught a football that was moving 5 mph North. The kicker scored a 30 yard field goal. Correct Response (C) (Video progresses to clip B) Incorrect Response (A,B,D) (Video progresses to clip E) CLIP B (DOK1) Visual <image> Audio Think to yourself, how do objects begin to move? http://pixabay.com/en/primate-monkeyorang-utan-460871/ <image> A contact force such as applied force and an action-at-a-distance force such as gravity are responsible for the motion of some objects. http://pixabay.com/en/waterfall-watercascade-downfall-166539/ <image> Motion occurs when forces are unbalanced. Gravity is pulling these raindrops down. http://pixabay.com/en/drip-raindrop-waterwet-8763/ <image> So, what happens to rain during a hurricane? http://pixabay.com/en/hurricane-earthsatellite-tracking-92968/ Question B Stem: Which scenario best describes an object(s) in motion? Answer Choices: A. B. C. D. A piano is resting on the floor in the living room. The piano is decorated with a fish bowl. My music lesson book is stored on a bookshelf. The cat jumps on the piano and knocks the fish bowl onto the floor. Correct Response (D) (Video progresses to clip C) Incorrect Response (A,B,C) (Video progresses to clip F) CLIP C (Increased DOK2) Visual <image> Audio During a hurricane, wind applies a force to the raindrops. This force causes the raindrops’ velocity to change. http://pixabay.com/en/key-west-floridahurricane-dennis-81664/ <image> http://pixabay.com/en/reminder-bow-redribbon-hand-23771/ Remember, velocity describes the speed and direction of an object. <image> Whenever a force is applied to an object in motion, it can change an object’s velocity. You can alter just the speed, just the direction, or both speed and direction. http://pixabay.com/en/blowball-dandelionwind-flower-411711/ <image> It is key to remember that unbalanced forces can change the velocity of an object. http://pixabay.com/en/blowball-dandeliongirl-blowing-384598/ Question C Stem: Which answer best describes unbalanced forces acting upon an object? Answer Choices: A. B. C. D. Shoes resting on the floor A ceiling fan turned off Rolling a ball on the floor Pushing a heavy box that will not move Correct Response (C) (Video progresses to clip D) Incorrect Response (A,B,D) (Video progresses to clip G) CLIP D (Increased DOK3) Visual <image> Audio Now, what happens to an object’s displacement if the object returns to its exact starting point? http://pixabay.com/en/tartan-track-careerrunway-609682/ <image> If an object returns to the starting point, its displacement is zero. Think of displacement as how out of place an object is. http://pixabay.com/en/yo-yo-game-playingstring-153545/ <image> It is key not to confuse displacement with distance. A car may travel a distance of fifty meters, but if the car returns to exactly where it started. How out of place is the car? http://pixabay.com/en/street-road-horizonendless-238458/ <image> http://pixabay.com/en/puzzle-play-puzzlepiece-particles-97544/ Describing an object’s motion can sometimes be tricky, but don’t let it puzzle you. Let’s see what you remember… Question D Stem: A rock’s initial position is 50 meters above the ground. The rock falls 20 meters straight down onto a ledge. As you are hiking by, you kick the rock 5 meters. What distance did the rock travel? Answer Choices: A. B. C. D. 25 meters 20 meters 75 meters 35 meters Correct Response (A) (Video progresses to Success Alert) Incorrect Response (B,C,D) (Video progresses to clip H) CLIP E (Remedial 1) Visual <image> http://pixabay.com/en/orange-fallingwater-fruits-275977/ Audio Whoa! Look at this orange in motion! I wonder how fast it was going, and how far it fell? <image> When we measure the distance from an object’s starting point to the object’s ending point, we can describe its motion by calculating its displacement. http://pixabay.com/en/tape-measuremeasure-meter-length-269293/ <image> We can also describe the motion of the orange using the term velocity. http://pixabay.com/en/orange-fallingwater-splash-fresh-165040/ <display images side by side> <image> The term velocity uses speed and direction to describe the object’s motion. http://pixabay.com/en/speedometertachometer-gauge-mph-153399/ <image> http://pixabay.com/en/shield-directoryforward-avanti-468079/ Question E Stem: Which term best describes the calculation between an object’s starting point and finishing point? Answer Choices: A. B. C. D. Motion Velocity Acceleration Displacement Correct Response (D) (Video progresses to clip B) Incorrect Response (A,B,C) (Video progresses to clip F) CLIP F (Remedial 2) Visual <image> Audio There are two types of forces in the world. ‘Contact forces’ and ‘action-at-a-distance’, (or ‘non-contact’) forces. http://pixabay.com/en/world-earth-planetglobe-spaceview-549425/ <image> Contact forces occur when two objects touch each other. Just like when this pool stick strikes a ball. http://pixabay.com/en/billiards-pool-tablerack-balls-662827/ <zoom in towards center of image> <image> Action-at-a-distance forces occur without objects touching each other. Gravity, the attraction of an object towards the center of the Earth, is a good example of this type of force. http://pixabay.com/en/world-earth-planetglobe-spaceview-549425/ <image> http://pixabay.com/en/designate-pokingfinger-indicate-427537/ Both contact forces and action-at-adistance forces can change the velocity of an object. Remember, velocity is the speed and direction of an object. Question F Stem: Which best describes an action-at-a-distance force? Answer Choices: A. B. C. D. Gravitational Force Applied Force Contact Force Air resistance Correct Response (A) (Video progresses to clip C) Incorrect Response (B,C,D) (Video progresses to Intervention Alert, bringing students back to clip B) CLIP G (Remedial 3) Visual <image> Audio When a force is applied to an object in motion, its velocity can change. This means that the speed of the object, direction of the object, or both speed and direction, can be altered. http://pixabay.com/en/girls-boys-playingsoccer-407295/ <image> When the soccer player applies a force with her foot to the ball. The ball’s speed and direction change. http://pixabay.com/en/football-ball-soccersports-game-155528/ <image> But instead of saying the ball’s speed and direction changed, we say the ball’s velocity changed. http://commons.wikimedia.org/wiki/File:Ch angwon_Soccer_Center_2.JPG <image> Think about it: When a hockey player hits the puck with his stick, does the velocity of the puck change? http://pixabay.com/en/hockey-hockeyplayer-winter-sports-297445/ Question G Stem: Which pair of words best describes the term velocity? Answer Choices: A. B. C. D. Speed and Acceleration Space and Direction Speed and Direction Acceleration and Direction Correct Response (C) (Video progresses to clip D) Incorrect Response (A,B,D) (Video progresses to clip F) CLIP H (Remedial 4) Visual <move ball along the direction of the arrow> <image> Audio Not only can we describe an object’s motion with the term velocity, but we can also use the term displacement, which describes an object’s change in position. http://pixabay.com/en/arrow-handdrawnblue-left-down-310599/ <image> http://pixabay.com/en/oldtimer-auto-pkwdare-nostalgic-534872/ <image> Sometimes it is easy to confuse distance and displacement. http://pixabay.com/en/skid-mark-asphaltroad-567668/ <image> http://pixabay.com/en/peas-pod-pea-pod- But don’t worry. Displacement becomes clear if you think about how out of place an object is. green-fresh-580333/ <image> Think about a book on a desk. It becomes displaced when it falls off onto the floor. http://pixabay.com/en/architect-deskoffice-workplace-569361/ Question H Stem: Which term best describes how “out of place” an object is? Answer Choices: A. B. C. D. Distance Displacement Position Velocity Correct Response (B) (Video progresses to Success Alert) Incorrect Response (A,C,D) (Video progresses to clip G)