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Forces Lesson 1
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Essential Question How Do Objects React To Forces? What is a force?
What are the Main Types of Forces? What Factors Affect Gravity?
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What Is a Force? When one object pushes or pulls another object, the first object exerts a force on the second. Shown with arrows (direction & force) SI units called newton after Sir Isaac Newton.
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What are the Main Types of Forces
Contact Forces (Friction) Forces at a Distance
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Contact Forces Applied Forces Normal Forces Friction Objects Touch
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Applied Forces A force that is put on an object by another object. Push--Pull
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Normal Force The force that acts between objects when they are in contact with each other.
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Friction The force that two surfaces exert on each other when they rub against each other.
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What If There Was No Friction?
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Forces at a Distance Electrical Forces Magnetic Forces
Gravitational Forces Objects Don’t Touch
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Electrical Forces The force between two charged objects
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Magnetic Force The attraction or repulsion between two magnetic poles
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Extra Credit: Build a Magnet
Things You'll Need Iron nail, wire, wire cutters, Knife, Battery, Tape, Paper clips, Adult Supervision
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Gravitational Force The force that pulls objects toward each other.
Sorry I was attracted to you! The law of universal gravitation states that the force of gravity acts between all objects in the universe that have mass!
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Two Factors Affect Gravity
Mass: the more mass the greater the gravitational force. Distance: the greater the distance the less gravitational force.
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May The Force Be With You!
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Try it! * An empty soda can * Blown-up balloon * A head of hair
1. Place the can on its side on a flat smooth surface like a table or a smooth floor. 2. Rub the blown up balloon back and forth through your hair really fast. 3. Now the fun part - Hold the balloon close to the can without actually touching the can. The can will start to roll towards the balloon without you even touching it! Try This Too: While you've got the balloon out, tear up part of a tissue into tiny pieces about 1/4 inch (.5 cm) big. Rub the balloon in your hair again and bring it close to the tissue pieces. They will be attracted to the balloon and then jump away. * An empty soda can * Blown-up balloon * A head of hair
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Home Learning Complete Lesson 1 Assess Your Understandings
Review & Assessment #1 Page Vocabulary Cards Lesson 1 Extra Credit: Gizmo #10 2/12 Extra Credit: Magnet 2/24 Extra Credit: Gizmo #11 2/27 Science in the News 2/27
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