example problem a man at the top of a building drops a ball. it takes 3 seconds for the ball to fall...
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Example ProblemA man at the top of a building drops a ball. It takes 3 seconds for the ball to fall to the ground, how tall is the building?
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Example ProblemA man is running with a constant velocity of 9 m/s and covers a distance of 27 m? How long was he running for?
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Example ProblemA man throws a ball horizontally from the top of a building with a velocity of 9 m/s. If the ball lands 27 m from the edge of the building, how tall is the building?
9 m/s
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Physics HonorsA/B–Day 11/1/15
Newton’s Laws
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Isaac Newton• Conceived Calculus• Described Planetary Motion• Designed and Constructed Reflecting Telescope
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Newton’s Laws of Motion• Seen as Father of Physics• Newton’s Laws are laid down in
Newton’s Principia
• Gravity is Universal
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Newton’s First Law of Motion• An object in motion continues in motion with the same
velocity unless acted upon by an unbalanced force; an object at rest will tend to stay at rest
The Law of Inertia
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Newton’s First Law of Motion• Inertia – the tendency of an object to maintain it’s state of
motion• Inertia developed by Galileo•Mass is a quantity that is determined by the inertia of the
object• Inertial Mass
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What is a Force?•Force - Any influence that causes a change in an
object’s velocity
•Vector• Can be a contact or Field Force• SI Unit is a Newton
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How do you represent Force?• Force Vector represents magnitude and direction
•
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Force Diagrams• Force • Can be in equilibrium (balanced) or could be
causing acceleration (unbalanced)
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Forces addition or subtraction
• Parallel Forces add or subtract • Perpendicular Forces do not affect each other
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Newton’s First Law of Motion• Example of 1st law would be if you ever sat in a truck
and it stopped.
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Newton’s Second Law of Motion• The acceleration of an object is directly proportional to the
net external force acting on the object and inversely proportional to the objects mass
m is the mass (kg)
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Newton’s Second Law of Motion
• Balanced Forces cause equilibrium • Moving or staying constant velocity
• Unbalanced Forces – cause object to accelerate
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Newton’s 2nd Law of Motion• What is a Balanced Force? Object at Rest or moving at a constant velocity
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Newton’s 2nd Law of Motion• What is an unbalanced Force? Object in Motion.
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Newton’s Third Law of Motion• If two objects interact, the magnitude of the force exerted on object
1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1 and these two forces are in opposite direction• Every action has an equal and opposite reaction
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How do you represent multiple forces on an object?
• Graphically Forces can be shown on a free body diagram
𝐹 𝑎𝑝𝑝𝑙𝑖𝑒𝑑
→
𝐹 𝑓𝑟𝑖𝑐𝑡𝑖𝑜𝑛
→
𝐹 𝑛𝑜𝑟𝑚𝑎𝑙
→
𝐹 h𝑤𝑒𝑖𝑔 𝑡
→
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Practice Problem• Draw a free body diagram for a book on a table not
moving.
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Practice Problem• Draw a free body diagram for a book on a table
moving at a constant velocity.
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Practice Problem• Draw a free body diagram for a book on a table
moving with a changing velocity (accelerating).
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Practice Problem• Draw a free body diagram for a book on an inclined
plane not moving.
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Practice Problem• Draw a free body diagram for a book sliding down an inclined
plane with no friction.• 2.0 kg
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Homework – Due 11/06/15
•Watch Videos on youtube Channel “Flipping Physics” Forces and Newton’s Laws of Motion