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toc Chapter Four yayy

= Physics Textbook: Newton's Laws- Lesson 1=

a) Newton's First Law What is Newton's first law of motion? -Newton's first law (or inertia): An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force How is it applied? -Coffee in a car: coffee cup filled to the rim, start a car from rest, accelerate the car from rest, the coffee (that was at rest) wants to stay at rest, while the car accelerates forward, the coffee remains in the same position, subsequently, the car accelerates out from under the coffee and the coffee spills in your lap. On the other hand, when braking from a state of motion the coffee continues forward //with the same speed and in the same direction//, ultimately hitting the windshield or the dash. Coffee in motion stays in motion
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b) Inertia and Mass How do inertia and mass affect the motion of an object? -Inertia is an object's resistance to motion changes in velocity and acceleration -An object will continue in motion unless an unbalanced force affects the inertia What is Galileo's deal with the concept of inertia? -The motion of moving objects ceases due to the force of friction
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c) State of Motion What is an object's state of motion? -The state of motion is the object's velocity, which is direction and speed -An object at rest does not change its state of motion, unless acted upon by an unbalanced force
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d) Balanced and Unbalanced Forces What are balanced and unbalanced forces? -Balanced forces are forces in opposite direction with equal magnitudes, which allow an object to continue its state of motion -Unbalanced forces are forces that have no counter-part, causing changes in inertia and/or state of motion (for example, a book sliding across a table makes friction) What effect do these fellas have on an object in motion or at rest? -Balanced forces allow on object to continue in its current state of motion -Unbalanced forces change an object's state of motion
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= Physics Textbook: Newton's Laws- Lesson 2=

a) The Meaning of Force What is the meaning of "force"? -A force is a push or pull on an object as a result of contact with another object
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b) Types of Forces What are the different types of forces? -Applied force: applied by an object -Gravity force/weight: pull by a massive object (ex, the Earth) exerted on another object -Normal force: support, applied by one object on another -Friction force: applied when two surfaces move across each other -Air resistance force: friction, for objects as the move through air -Tension force: applied by a rope, string, chain, or wire -Spring force: exerted by a compressed spring on the object attached to it
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c) Drawing Free Body Diagrams What is a free body diagram? -A vector diagram in which all of the force acting upon an object are shown What does one do when drawing a free body diagram? -Separate the system (object) from its surroundings -Draw the arrows in the direction in which the force is pointed -Weight is always straight down -Normal is perpendicular to the surface that's applying it -Tension is the direction the rope is in -Friction is the opposite way the object would go if it was not being applied
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d) Determining the Net Force What is a net force? -Net force is the vector sum of all force acting on an object How is the net force determine? -Add all of the forces together (like adding vectors) and label
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= Physics Textbook: Newton's Laws- Lesson 3=

a) Newton's Second Law What is Newton's second law of motion?!?!? -It shows the behavior of objects who have unbalanced forces -Acceleration directly depends on net force and indirectly on object mass -Fnet = ma
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b) The Big Misconception What is this misconception you speak of? -Continued motion needs continues force!! -Butttt, no force is needed to keep a horizontally-moving object in motion (gasp, bajabbers!)
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