Slide 1 / 106 Slide 2 / 106 3rd Grade Motion and Stability 2015-11-09 www.njctl.org Slide 3 / 106 Slide 4 / 106 Table of Contents Click on the topic to go to that section · Forces and Motion Review Forces and Motion · Balanced and Unbalanced Forces · Motion prediction from patterns Review Non Contact Forces · Return to Table of Contents Slide 5 / 106 Slide 6 / 106 Review! Review How far do you have to walk to get Those questions have one thing in common - what is it? to the chalkboard? ________________ is how we measure how far away an item is. Teacher How far away is your teacher's desk? "The chalkboard is 7 steps away." "The desk is 3 steps away." How many steps do you have to "The bathroom is 29 steps away." take to reach the bathroom?
Slide 7 / 106 Slide 8 / 106 Distance 1 Which object is the closest to you (and has the smallest distance from you)? The farther away something is, the _______________ A Your house its distance is from you. Teacher The closer something is, the ______________ its B The Moon distance is from you. C The Sun What's farther from you now, your desk or your home? Slide 8 (Answer) / 106 Slide 9 / 106 1 Which object is the closest to you (and has the smallest Review distance from you)? A Your house What takes longer to do, watching a TV show or washing your hands after dinner? Answer B The Moon A What do we measure to figure this out? C The Sun [This object is a pull tab] Slide 10 / 106 Slide 11 / 106 Review Time To figure those answers What are some units we use to measure time? out we need to measure Think about very small measurements and very _____________! large measurements! Make a list at your table. __________ is used to show how long it takes to do something.
Slide 12 / 106 Slide 12 (Answer) / 106 2 When talking about how far away something is from you, 2 When talking about how far away something is from you, we use the word ____________. we use the word ____________. A time A time Answer B distance B distance B [This object is a pull tab] Slide 13 / 106 Slide 13 (Answer) / 106 3 If you measured how long your desk is, you would be 3 If you measured how long your desk is, you would be talking about a ___________. talking about a ___________. A time A time Answer B distance B distance B [This object is a pull tab] Slide 14 / 106 Slide 14 (Answer) / 106 4 If you measured how long it takes to walk from your 4 If you measured how long it takes to walk from your house to your friend's house, you would be talking about house to your friend's house, you would be talking about ____________. ____________. A time A time Answer B distance B distance A [This object is a pull tab]
Slide 15 / 106 Slide 15 (Answer) / 106 5 If you were timing how long it took to walk a mile, you 5 If you were timing how long it took to walk a mile, you would probably use __________ as your unit. would probably use __________ as your unit. A seconds A seconds B minutes B minutes Answer B C hours C hours D days D days [This object is a pull tab] Slide 16 / 106 Slide 16 (Answer) / 106 6 If you were timing how long it took to blink your eyes, you 6 If you were timing how long it took to blink your eyes, you would probably use __________ as your unit. would probably use __________ as your unit. A seconds A seconds B minutes B minutes Answer A C hours C hours D days D days [This object is a pull tab] Slide 17 / 106 Slide 17 (Answer) / 106 7 If you were timing how long it took to fly from Africa to 7 If you were timing how long it took to fly from Africa to Spain in a airplane you would probably use __________ Spain in a airplane you would probably use __________ as your unit. as your unit. A seconds A seconds Answer C B minutes B minutes C hours C hours D days D days [This object is a pull tab]
Slide 18 / 106 Slide 18 (Answer) / 106 8 Which of these activities takes the longest to do? 8 Which of these activities takes the longest to do? A Eating dinner (half an hour) A Eating dinner (half an hour) B Brushing your teeth (two minutes) B Brushing your teeth (two minutes) Answer B C Watching a movie (hour and a half) C Watching a movie (hour and a half) [This object is a pull tab] Slide 19 / 106 Slide 20 / 106 How fast do you go? Discussion Questions Does it take longer to walk or run home? The word _____________describes how Do people walk or run when they are in a race? Why? fast or how slow you go. When you walk, are you going slow or fast? When you run, are you going slow or fast? How do you know whether you are going fast or slow? Slide 21 / 106 Slide 22 / 106 Speed Speed Objects with more Objects with less speed speed can move a move a shorter distance in a greater distance in a set amount of time . Teacher set amount of time . This is why it takes you This is why the fastest longer to move somewhere if runner reaches the you are walking instead of finish line first. running.
Slide 23 / 106 Slide 24 / 106 9 A block is pushed 30 meters in 5 second. What is its Speed Math speed? Speed, mathematically, is distance divided by time. Distance ÷ Time = Speed Teacher Moving 10 meters in 5 seconds gives you a speed of (10 meters ÷ 5 seconds) ________ meters per second. Slide 24 (Answer) / 106 Slide 25 / 106 9 A block is pushed 30 meters in 5 second. What is its 10 A baseball is thrown 26 meters in 2 seconds. What is its speed? speed? Answer 30 meters / 5 seconds = 6 meters per second. [This object is a pull tab] Slide 25 (Answer) / 106 Slide 26 / 106 10 A baseball is thrown 26 meters in 2 seconds. What is its 11 From the last 2 examples, which is faster? speed? A block B baseball Answer (26 meters / 2 seconds) 13 meters per second. [This object is a pull tab]
Slide 26 (Answer) / 106 Slide 27 / 106 11 From the last 2 examples, which is faster? 12 Which of these is the slowest? A block A A walking man B baseball B A running track star Answer B baseball C A speeding car [This object is a pull tab] Slide 27 (Answer) / 106 Slide 28 / 106 12 Which of these is the slowest? 13 You slide a book, which moves 6 meters in 2 seconds. What is its speed? A A walking man A 2 m/s B A running track star Answer B 3 m/s A C A speeding car C 4 m/s [This object is a pull tab] Slide 28 (Answer) / 106 Slide 29 / 106 13 You slide a book, which moves 6 meters in 2 seconds. Distance, Time, and Speed What is its speed? A 2 m/s The following lab explains what distance, time, and Answer speed are through various activities B 3 m/s B C 4 m/s [This object is a pull tab]
Slide 30 / 106 Slide 31 / 106 Forces Forces There is a name for pushing or pulling something. When you push or pull something, you are using a force! What is this man What is this Teacher doing? man doing? A force is a push or a pull. Similar to how we can measure distance in _________ and time in ___________, we measure force in Newtons (N). Slide 32 / 106 Slide 33 / 106 14 This is an example of a ________. Forces A push A force is a push or a pull, and is measured in Newtons (N). B pull By the way, where did Teacher the word Newton come from? Slide 33 (Answer) / 106 Slide 34 / 106 14 This is an example of a ________. 15 When you ring a doorbell, you ________ the buzzer. A push A push B pull B pull Answer B [This object is a pull tab]
Slide 34 (Answer) / 106 Slide 35 / 106 15 When you ring a doorbell, you ________ the buzzer. 16 This boy is pushing his wagon. A push True B pull False Answer A [This object is a pull tab] Slide 35 (Answer) / 106 Slide 36 / 106 16 This boy is pushing his wagon. Motion True When you ________ or _________on something and make it move, you are causing motion ! False Answer FALSE The harder you push or pull on something while it is moving, the more you change its motion. [This object is a pull tab] More force leads to more change in speed. Slide 37 / 106 Slide 38 / 106 Motion Motion Using a force on an object changes its motion. If you kick a soccer ball, it eventually stops . Imagine a ball rolling towards you. When it gets to you, you What pushes can push the ball away from back on the you and slow it down. ball to make it stop? If you keep pushing hard enough, you can stop the ball.
Slide 39 / 106 Slide 40 / 106 Friction Friction The ball stops its motion due to a force called friction. The friction force against always acts Friction is the force from two surfaces rubbing against the object's motion. It each other. Friction is always present when two objects rub always tries to slow against one another. things down. Motion of The grips on these What two objects the ball socks provide more are rubbing in this friction with the floor example? than the socks alone. Friction Why is friction important to have with these socks? Slide 41 / 106 Slide 42 / 106 Friction Examples of Friction At your table, talk about what you know about these two The friction between two objects depends on the surface of sports and how friction is involved with them. each object. Teacher What will move farther, a hockey puck pushed across a gym floor, or a puck pushed on ice? Slide 43 / 106 Slide 43 (Answer) / 106 17 Which example has the most friction? 17 Which example has the most friction? A A skater moving on an ice rink A A skater moving on an ice rink Answer B A box pushed on tile that slides far before stopping B A box pushed on tile that slides far before stopping C C A box pushed on gravel that stops moving instantly C A box pushed on gravel that stops moving instantly [This object is a pull tab]
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