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Chapter 12 Force
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Force Vocabulary FORCE- BALANCED FORCES- UNBALANCED FORCES- A push or pull. Forces that are equal in size, but opposite in direction. Forces that cause a change in the motion of an object.
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GRAVITY- Force of attraction between all objects in the universe. NEWTON- WEIGHT- MASS- SI unit of force. The amount of matter in an object. Measure of the force of gravity acting on an object.
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FRICTION- STATIC FRICTION- SLIDING FRICTION- ROLLING FRICTION- AIR RESISTANCE- Force that opposes the motion of an object. Occurs when objects are not moving. Occurs when 2 objects slide past each other. Occurs when 2 objects roll past each other. An upward push as an object falls.
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LUBRICANTS- Materials that reduce friction.
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Key Topic is… What is Force? Our Objective is… Define force and give examples of forces in nature. Identify balanced and unbalanced forces and describe their effects.
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1st Main Idea… Force A ________ is _________________________. A ______ always ___________________________. If the force is _________ __________, the object _____ ______ in the ________________________.
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Force ? ? PUSH PULL Courtesy: Clipart.com Courtesy:tugfest.com
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Ch. 12 Force Sec 12-1 2nd Main Idea… Balanced Forces To _______ a force, you must ________________. 1. 2. ______ forces are _____________________ and ______________________. _________ forces do not
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Examples!! Balanced Forces-No Movement 25 N Courtesy: clipart.com
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Force 3rd Main Idea… Unbalanced Forces _________ forces cause ___________________ ____________________.
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Ch. 12 Force Sec 12-1 UnBalanced Forces-Movement 25 N 10 N Courtesy: clipart.com
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Force 4th Main Idea… Forces & Motion ________ forces can ______________ _______________________. 1. 2.
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5th Main Idea… Forces In Nature Examples of forces you experience everyday: _________- a measure of _________ between ________________________. _______ force- attraction of a __________________________________. _____ force-moving _________________. Falling ______ is caused by ________________.
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Force http://www.milfordroad.co.nz/images/avalanche.jpg https://www.forcefieldmagnets.com/catalog/images/cat_magnets.jpg http://www.lcpu.org/images/windy-day.jpghttp://www.codinghorror.com/blog/images/waterfall.jpg
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Force – Part 2 Key Topic is… What is Gravity? Our Objective is… Explain Newton’s laws of gravity.
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Force – Part 2 1st Main Idea… Sir Isaac Newton ________ hypothesized that there is a ________ called _________ that makes _________________________________ ______. Newton’s law of Universal Gravitation- _________________________________ _________________________________ _________________________________.
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Ch. 12 Force Sec 12-2 2nd Main Idea… Gravity _______ is a _____________________ between ________________________. ____ _________ on or near _________________ are ________ toward __________________________ _________________________________.
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Force – Part 2 3rd Main Idea… Gravity & Mass The amount of ____________________ between ____ _________ depends on ____________________________________ ________. When an apple falls, they both _________________________________. However, because___________________ than the ______, the Earth_____________.
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Force – Part 2 4th Main Idea… Gravity & Distance The ____________________________ between _________________________ as the __________________________.
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Force – Part 2
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Forces – Part 2 1. DESCRIBE: In which direction does an object fall on Earth? 2. EXPLAIN: Why is the force of Earth’s gravity so strong?
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Force – Part 3 Key Topic is… How does a Spring Scale Work? Our Objective is… Describe how a spring scale is used to measure weight.
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Force – Part 3 1st Main Idea… The SI Unit of Force The _______ is the ________________. On Earth, ________________________ to lift a __________________________. ________ is a measure of the _________________________________. Because it is a ______, the object’s ________ is measured in _________(N).
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Force Part 3 2nd Main Idea… Using a Spring Scale A ________ ________ measures the _________________________________ ____________; this is also called its _________________.
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Force – Part 3 3rd Main Idea… Types of Spring Scales There are ______ _____ of _______ _________. Ex. Lab scales, bathroom scales & market scales. Weight pushes or pulls on a _______ causing a dial or pointer to turn until it shows the _______ of the object.
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Ch. 12 Force Sec 12-3
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Force – Part 3 1. IDENTIFY: What are you measuring when you weigh an object? 2. IDENTIFY: What does a spring scale measure? 3. What are three types of spring scales?
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Force – Part 4 Key Topic is… What is Friction? Our Objective is… Identify examples of friction.
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Ch. 12 Force Sec 12-4 1st Main Idea… Forces & Motion To stop a _______ ________, a _______ must act in the __________________to the direction of the __________. Observe: Give your book a slight push. What happens? __________________. What must you do to keep it moving? ________________________________.
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Force – Part 4 http://ffden- 2.phys.uaf.edu/211_fall2002.web.dir/Ben_Towns end/StaticandKineticFriction.htm http://www.school-for- champions.com/science/friction.htm
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Ch. 12 Force Sec 12-4 2nd Main Idea… Friction _______ is a_______________________ ____________________________.
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Force – Part 4 3rd Main Idea… Types of Friction Types of friction when there is contact between surfaces: _______ friction, a book ____________. ______ friction, a book _____________. ______ friction, contact between bike ________. ___ __________ (Fluid friction) pushes _______ _______________ as it falls.
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Force – Part 4
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4th Main Idea… Useful Friction _______ makes ___________________. Without ___________, you would not be able to ___________________, _______________, _________________, or ___________________.
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Force – Part 4 5th Main Idea… Harmful Friction Unwanted _________ can be found in ________ ___________________. _______ _____ rub together and ______ ______ and can cause __________________________.
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Ch. 12 Force Sec 12-4
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Force – Part 5 Key Topic is… How can friction be changed? Our Objective is… Describe some ways to change friction.
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Force – Part 5 1st Main Idea… Moving Against Friction Because friction _______________________ to move _______, ______________ is needed to _________________________________.
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Ch. 12 Force Sec 12-5 2nd Main Idea… Using Rolling Friction One way to _______ ________ is to __________ ________ ________ to _____________________. _______ friction is ________________________ friction.
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Force – Part 5 3rd Main Idea… Using Lubricants __________ are ___________________. ____ is a ____________ that ________ ________________________ from one another.
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Force – Part 5 4th Main Idea… Not Enough Friction Slipping on an icy sidewalk or a ____________ _____________ are examples of when there is _______________________________ surfaces. To ________ ________ we sometimes _______ _______ on an _____ _____ or wear special __________________.
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Force – Part 5 www.superiorspecialty.com/.../Incom/GritE.html
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Force – Part 5 1. CALCULATE: If the force of friction is 16 N, how much force is needed to move the object? 2. IDENTIFY: When would it be helpful to use a lubricant? 3. HYPOTHESIZE: Why do staircases often have rubber mats on the steps?
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