Youtor
35 Forces STEMscopes at Home
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=xFq6XTYdsUA
Visit https://www.stemscopes.com/ to learn more! • In this demonstration, students experiment with how the forces of gravity and magnetism work to affect different objects. • If you are a STEMscopes customer you can assign work from the following scopes to help supplement the activity highlighted in this video: • Texas: 3.6C Magnetism and Gravity • Georgia: 5P3AB Types of Magnets • Mississippi: P.3.6 Forces • Tennessee: 3 Magnets Effect on Objects • North Carolina: 4.P.1.1 Magnets and Motion • Florida: 4.P 8.4 Magnets • Virginia: 2.2B Magnetism and Gravity • Click the links below for the handouts that will be used during this investigation: • Engage Student Handout: https://drive.google.com/open?id=1Gu-... • Here are links to additional resources you can use to further learn about this topic: • STEMscopedia: https://drive.google.com/open?id=17qT... • Independent Practice: https://drive.google.com/open?id=17qT... • More Information on the Topic: • Many forces exist in our universe, but the three that third-grade students will focus on are gravity friction and magnetism. • Mass is the stuff that makes up all things in the universe. The more mass an object has, the harder it is to move. Gravity is the attraction between any two masses. The force of gravity is stronger when the masses are greater. If you move farther away, the force gets weaker. • Students need to understand that the pull of gravity is two-way, similar to a tug-of-war between two objects. Size and distance matter. Gravity depends on mass and distance. Although a gravitational attraction exists between all objects in the universe, the size of that pull depends on the masses of the objects and the distance between them. The Sun is so massive that its gravity can pull everything in the solar system into orbit around it. The pull of gravity between small objects, such as two humans, is too small to matter. However, if one of the objects, such as a planet, is massive enough, the pull of gravity is significant. Because Earth is much more massive than a person, the pull from a human body is not strong enough to move Earth. • Distance affects the pull of gravity. The farther an object is from the center of Earth, the less is the pull of gravity. Since the Moon is close to Earth and is a quarter of the size of Earth, there is enough gravity between the Moon and Earth to pull on the ocean waters on opposite sides of the Earth, which causes tides to rise and fall. On Earth, students experience the force of gravity every day. For example, when students jump up, gravity pulls them back down to Earth. When a ball is thrown into the air, gravity pulls it back down to Earth. The pull of Earth’s gravity is so strong that rockets need tremendous escape velocity just to get into orbit. • Things in nature move downward because of gravity. Mountain rivers flow down to the ocean, and glaciers push slowly down a mountain. Plant roots grow downward. Rain and snow fall down. Leaves fall off trees and down to the ground during autumn. Heavy things sink in water. The list is endless. • Sometimes gravity pulls down so hard that surfaces can rub together causing friction and heat. Race car tires can burn up when they speed along. The tires heat up, start to burn, and smoke from rubbing against the track. Students can feel the heat caused by friction when they vigorously rub their hands together. Engineers design planes and cars to minimize the friction of the air rubbing against the surfaces by creating a streamlined, pointed front so the air just flows smoothly instead of encountering resistance. • Sometimes friction is a good thing. For example, you need to have friction with your shoes to push against the floor, or you would slip as though you were on ice! You need friction to write with a pencil, or the lead would not stick to the paper. You need friction for your car’s tires to go down the road, or the car would slip all around.
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