Acceleration
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1) Acceleration is the rate of change of velocity with time. It can be positive, indicating an increase in speed or change in direction, or negative, indicating a decrease in speed or change in direction. 2) A car accelerating from 60 mph to 90 mph in 3 seconds has an acceleration of 10 mph/sec. A car braking from 60 mph to a stop in 6 seconds has a negative acceleration of -10 mph/sec. 3) Falling objects near the Earth's surface accelerate at approximately 10 m/s2 due to gravity. Their velocity increases linearly with time until air resistance balances the gravitational force and the object reaches terminal velocity.
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The document discusses motion in one dimension, including displacement, velocity, acceleration, and free fall. It defines key terms like displacement as a change in position, average velocity as displacement over time, and acceleration. Examples show how to calculate displacement, velocity, and acceleration using equations. Free fall acceleration is constant at about 10 m/s^2 downward. Graphs of position, velocity, and acceleration over time are used to represent motion.
Motion
Motion depends on reference points - an object is moving if its position changes relative to a stationary reference object. Average speed is the total distance traveled divided by the total time taken, and can be used to calculate the speed of objects that do not travel at a constant rate. Acceleration is the rate at which an object's velocity changes - it describes how the speed of an object is increasing or decreasing over time.
Velocity, acceleration, free fall ch4 reg
1. Motion can be described as a change in an object's position over time. Examples include a train moving along tracks or an object falling due to gravity.
2. Displacement describes the direction and size of an object's movement from its starting point. It is a vector quantity while distance traveled is a scalar.
3. Velocity is displacement divided by time and describes both speed and direction of motion. Acceleration is the rate of change of velocity with respect to time. During free fall, acceleration due to gravity is constant.
Fourth six weeks review
The document discusses key concepts in motion including frames of reference, speed, velocity, acceleration, momentum, Newton's laws of motion, gravity, weight, and air resistance. It provides examples and practice problems for each concept. Key terms like force, mass, distance, and time are defined throughout in the context of describing and quantifying different types of motion.
Fourth six weeks review
The document discusses key concepts in motion including frames of reference, speed, velocity, acceleration, momentum, Newton's laws of motion, gravity, weight, and air resistance. It provides examples and practice problems for each concept. Key terms like force, mass, distance, and time are defined throughout in the context of describing and quantifying different types of motion.
Uniformly Accelerated Motion and Free Fall Motion_NOTES.pptx
An object is in Free-Fall when the only force acting on the object is the Force of Gravity, however, we haven’t defined
Force much less the Force of Gravity, so, until we have defined the Force of Gravity, we have a slightly different definition.
An object is in Free-Fall when:
- It is not touching any other objects♥
- There is no air resistance (it’s in the vacuum we can breathe)
We are now in the vacuum that we can breathe and will be for the remainder of this class, unless otherwise stated.
Common Misconception: For some reason people think the word “fall” in Free-Fall means that the object must be going
down. This is absolutely, not true. An object thrown upward is in Free-Fall from the moment it leaves the persons hand
until it touches the ground.
L2
1) The document discusses various concepts related to motion including speed, velocity, acceleration, and their relationships.
2) It defines key terms like speed, velocity, scalars, vectors, and acceleration and provides examples of how they apply to motion.
3) Examples are given of constant and changing velocity and acceleration in situations like a car moving in a straight line or circular motion.
Phy100sp20_Lec2.pdf
The document provides information about physics 100, including notes on linear motion and chapter 3 on the same topic. It defines key terms like speed, velocity, acceleration, instantaneous speed vs average speed, and motion under constant acceleration. It also discusses free fall acceleration as well as two dimensional projectile motion with horizontal velocity and vertical acceleration. Examples are provided for calculating speed, distance, and time for objects undergoing linear or accelerated motion.
Lesson+5+Acceleration+Starter
The document discusses acceleration and how to calculate it using the change in velocity over time. It provides an example of two cars, a sports car and a Volvo, accelerating from 0 to 100 km/h. The sports car accelerates faster, reaching the final speed in 5 seconds compared to 10 seconds for the Volvo. Calculating the acceleration shows the sports car's acceleration is 6 m/s2 and the Volvo's is 3 m/s2. It then presents the general equation for acceleration as a = change in velocity/time.
Objects in motion - 03 Acceleration
Acceleration is the rate of change of an object's speed over time. It can be calculated using the formula: acceleration = change in speed/change in time. Acceleration is measured in meters per second squared (m/s2). The slope of a speed-time graph directly corresponds to an object's acceleration - a steeper slope indicates higher acceleration. An object's acceleration can be determined by analyzing the slopes in its speed-time graph over different time periods.
Motion Notes 2005
This document provides an overview of key concepts in mechanics and motion, including:
- Definitions of speed, velocity, acceleration, and related formulas. Speed is rate of change in position, velocity includes direction of motion.
- Discussion of different types of motion (constant, average, instantaneous speed) and forces (balanced, unbalanced). Newton's three laws of motion are introduced.
- Explanations of concepts like inertia, friction, gravity, mass vs. weight, projectile motion, and circular/centripetal motion, with examples provided.
motion refresher ppt.ppt
1. The document describes various concepts related to motion including speed, velocity, acceleration, and how to represent motion graphically. It defines key terms like reference point, displacement, and scalar and vector quantities.
2. Examples are provided for calculating speed, acceleration, and time it takes for an object to travel a distance or come to a stop.
3. Motion can be represented on distance-time or speed-time graphs where slope and shape of the line indicate properties of motion like constant speed or changing velocity.
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Uniformly Accelerated Motion and Free Fall Motion_NOTES.pptx
Uniformly Accelerated Motion and Free Fall Motion_NOTES.pptx
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The seasons are caused by the 23.5 degree tilt of the Earth's axis as it revolves around the sun, resulting in different parts of the Earth receiving more or less direct sunlight over the course of a year. Summer occurs in the northern hemisphere when its axis is tilted toward the sun, producing longer days, and winter happens when the axis is tilted away from the sun for shorter days. The changing position of the Earth relative to the sun's rays is responsible for seasonal variations in weather patterns and daylight hours around the world.
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Volcanoes erupt when pressure from gases and magma built up in the volcano's magma chamber is too great. This is similar to the pressure build up in a balloon until it bursts. When the pressure is released, gases and molten rock (magma) are ejected from the volcano in explosive eruptions or flow out as lava in nonexplosive eruptions. Volcanoes form at boundaries where tectonic plates meet, especially at subduction zones, as well as at hot spots in the mantle.
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澳洲UWS毕业证书制作西悉尼大学假文凭定制Q微168899991做UWS留信网教留服认证海牙认证改UWS成绩单GPA做UWS假学位证假文凭高仿毕业证申请西悉尼大学University of Western Sydney degree offer diploma Transcript
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3:国家专业人才认证中心颁发入库证书
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Orpah Winfrey Dwayne Johnson: Titans of Influence and Inspiration
Introduction
In the realm of entertainment, few names resonate as Orpah Winfrey Dwayne Johnson. Both figures have carved unique paths in the industry. achieving unparalleled success and becoming iconic symbols of perseverance, resilience, and inspiration. This article delves into the lives, careers. and enduring legacies of Orpah Winfrey Dwayne Johnson. exploring how their journeys intersect and what we can learn from their remarkable stories.
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Early Life and Backgrounds
Orpah Winfrey: From Humble Beginnings to Media Mogul
Orpah Winfrey, often known as Oprah due to a misspelling on her birth certificate. was born on January 29, 1954, in Kosciusko, Mississippi. Raised in poverty by her grandmother, Winfrey's early life was marked by hardship and adversity. Despite these challenges. she demonstrated a keen intellect and an early talent for public speaking.
Winfrey's journey to success began with a scholarship to Tennessee State University. where she studied communication. Her first job in media was as a co-anchor for the local evening news in Nashville. This role paved the way for her eventual transition to talk show hosting. where she found her true calling.
Dwayne Johnson: From Wrestling Royalty to Hollywood Superstar
Dwayne Johnson, also known by his ring name "The Rock," was born on May 2, 1972, in Hayward, California. He comes from a family of professional wrestlers, with both his father, Rocky Johnson. and his grandfather, Peter Maivia, being notable figures in the wrestling world. Johnson's early life was spent moving between New Zealand and the United States. experiencing a variety of cultural influences.
Before entering the world of professional wrestling. Johnson had aspirations of becoming a professional football player. He played college football at the University of Miami. where he was part of a national championship team. But, injuries curtailed his football career, leading him to follow in his family's footsteps and enter the wrestling ring.
Career Milestones
Orpah Winfrey: The Queen of All Media
Winfrey's career breakthrough came in 1986 when she launched "The Oprah Winfrey Show." The show became a cultural phenomenon. drawing millions of viewers daily and earning many awards. Winfrey's empathetic and candid interviewing style resonated with audiences. helping her tackle diverse and often challenging topics.
Beyond her talk show, Winfrey expanded her empire to include the creation of Harpo Productions. a multimedia production company. She also launched "O, The Oprah Magazine" and OWN: Oprah Winfrey Network, further solidifying her status as a media mogul.
Dwayne Johnson: From The Ring to The Big Screen
Dwayne Johnson's wrestling career took off in the late 1990s. when he became one of the most charismatic and popular figures in WWE. His larger-than-life persona and catchphrases endeared him to fans. making him a household name. But, Johnson had ambitions beyond the wrestling ring.
In the early 20
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Acceleration
- 1. Acceleration
- 2. Change in Velocity Each time you take a step you are changing the velocity of your body. You are probably most familiar with the velocity changes of a moving bus or car. The rate at which velocity (speed or direction) changes occur is called acceleration.
- 3. Acceleration= final velocity- starting velocity time Change in velocity = final – starting velocity velocity Acceleration= change in velocity time
- 4. A car traveling at 60 mph accelerates to 90 mph in 3 seconds. What is the car’s acceleration? Velocity(final) - Velocity(original) = Acceleration time 90 mph - 60 mph = 3 seconds 30 mph = 3 seconds = 10 mph/second
- 5. Positive acceleration Negative acceleration
- 6. A car traveling at 60 mph slams on the brakes to avoid hitting a deer. The car comes to a safe stop 6 seconds after applying the brakes. What is the car’s acceleration? Velocity(final) - Velocity(original) = Acceleration time 0 mph - 60 mph = 6 seconds - 60 mph = 6 seconds = - 10 miles per hour per second
- 7. - A constant acceleration produces a straight line or linear slope (rise/run). - The slope of a non-linear velocity-time graph (rise/run) will predict an objects instantaneous acceleration. a = v/t
- 8. Free fall The constant acceleration of an object moving only under the force of gravity is "g". The acceleration caused by gravity is 10 m/s2 If there was no air, all objects would fall at the same speed Doesn’t depend on mass After 1 second falling at 10 m/s After 2 seconds 20 m/s 3 seconds 30 m/s
- 9. Falling Air resistance will increase as it falls faster An upward force on the object Eventually gravity will balance with air resistance Reaches terminal velocity - highest speed reached by a falling object.
- 11. until the force is equal
- 12. Equal forces, no acceleration