Acceleration and force 2010
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This document discusses acceleration and forces. It defines acceleration as a change in an object's speed or direction over time. Acceleration is calculated by the change in velocity divided by time. An object accelerates when the net force acting upon it is unbalanced. The greater the net force, the greater the acceleration will be. Gravity and mass affect acceleration as well. Gravity causes free-falling objects to accelerate at 9.8 m/s^2. The more massive an object is, the more force is needed to accelerate it.
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Moving electrons can do work and produce power, which is the rate of energy usage. Power equals current multiplied by voltage and is measured in watts. For example, a clock radio drawing 0.05 amps from a household circuit can be calculated to determine the power needed to operate it. Electrical energy is supplied by power companies through power lines and sold to homeowners in units of kilowatt-hours, with more usage demanding more kilowatts. The amount of electrical energy provided by the power company for a 1200W toaster oven used for 15 minutes can be calculated using the formula of power multiplied by time.
Lab23 chisquare2007
1) The document provides instructions for students to conduct a coin toss experiment to demonstrate probability and use a chi-square test to analyze the results. It explains that genetics involves random chance processes that can be modeled with coin tosses.
2) Students will toss two coins 100 times in groups and record head/head, head/tail, and tail/tail outcomes. They will then use a chi-square test to compare observed results to expected results based on probability laws.
3) The chi-square test allows students to determine if any differences between observed and expected results are statistically significant, which could mean factors other than chance are influencing the outcomes. This analysis method is important for studying inheritance patterns in genetics.
33 ch09respiration12008
Cellular respiration involves four stages to harvest energy from glucose and produce ATP. In the first stage, glycolysis, glucose is broken down without oxygen to form pyruvate. The next two stages, pyruvate oxidation and the Krebs cycle, occur in the mitochondria using oxygen. In these stages, electrons are transferred to electron carriers like NADH and FADH2. In the final stage, the electron transport chain, the electron carriers donate their electrons to oxygen and protons are pumped across the membrane. This creates a proton gradient that is used by ATP synthase to phosphorylate ADP and produce ATP. The overall process of cellular respiration oxidizes glucose and reduces oxygen to produce carbon dioxide, water, and ATP
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The document contains slides from a video lesson on physics concepts. The slides are color coded by topic: red for word problems, tan for concepts, green for graphing, olive for data tables. Key concepts defined include displacement, velocity, acceleration, inertia, force, and momentum. Graphing concepts like position, velocity, and acceleration graphs are presented for different motion scenarios. Force diagrams are matched to motion maps and used to predict kinematic graphs.
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1) Rotational inertia is the resistance of an object to changes in its rotational motion and depends on how mass is distributed relative to the axis of rotation. More mass distributed farther out leads to greater rotational inertia.
2) Tightrope walkers carry long poles to increase their rotational inertia and stability.
3) Ice skaters spin faster when they bring their arms in because this decreases their rotational inertia, requiring conservation of angular momentum to increase their angular velocity.
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The document discusses concepts related to motion including reference frames, distance, speed, velocity, acceleration, and types of motion like uniform motion, uniformly accelerated motion, free fall, and projectile motion. It specifically focuses on free fall, defining it as the motion of an object under the influence of gravity alone. It describes key properties of free fall including negative acceleration due to gravity, time symmetry, and speed symmetry. Examples of calculating velocity during free fall are provided. Projectile motion is also introduced as motion where the only force acting is gravity, having both horizontal and vertical components.
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This document discusses acceleration and how it relates to changes in an object's velocity over time. It defines acceleration as the rate of change of velocity, whether that means changing speed or direction. Acceleration is calculated by finding the change in velocity divided by the time taken. Positive acceleration increases velocity while negative acceleration decreases velocity. The constant acceleration due to gravity on Earth is approximately 10 m/s2. Free falling objects experience this acceleration and will fall at increasing speeds over time if air resistance is negligible. Galileo was one of the first scientists to study acceleration from gravity by rolling objects down inclined planes and observing their increasing speed over time.
Acceleration ( 1 )
Acceleration refers to the process of an object changing its speed, whether by increasing or decreasing speed, or changing direction. An object accelerates when its speed increases over time. An object also accelerates when its speed decreases, which is called deceleration or negative acceleration. Even objects moving at a constant speed accelerate if they change direction, like seats on a Ferris wheel. To calculate acceleration, you determine the change in speed over a period of time by taking the final speed minus the initial speed and dividing by the time elapsed.
Acceleration ( 1 )
Acceleration refers to the process of an object changing its speed, whether by increasing or decreasing speed, or changing direction. An object accelerates when its speed increases over time. An object also accelerates when its speed decreases, which is called deceleration or negative acceleration. Even objects moving at a constant speed accelerate if they change direction, like seats on a Ferris wheel. To calculate acceleration, you determine the change in speed over a period of time by taking the final speed minus the initial speed and dividing by the time elapsed.
Acceleration ( 1 )
Acceleration refers to the process of an object changing its speed, whether by increasing or decreasing speed, or changing direction. An object accelerates when its speed increases over time. An object also accelerates when its speed decreases, called deceleration or negative acceleration. Even objects moving at a constant speed accelerate if they change direction, like seats on a Ferris wheel. To calculate acceleration, you determine the change in speed over a period of time, with acceleration measured in meters per second squared.
Nota Fizik
The document describes key concepts related to forces and motion, including:
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**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
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This document discusses Newton's laws of motion and simple machines. It defines key terms like mass, acceleration, balanced and unbalanced forces, momentum, action and reaction, work, and different simple machines including the lever, inclined plane, pulley, wheel and axle, wedge, and screw. Interactive elements like pictures and videos are included to further explain and demonstrate these concepts.
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This document defines key terms related to Newton's second and third laws of motion such as mass, acceleration, force, balanced and unbalanced forces, momentum, action and reaction. It also describes different types of simple machines including the lever, fulcrum, effort arm, resistance arm, inclined plane, pulley, wheel and axle, and wedge. Clicking on the pictures throughout the text provides additional information about each term.
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Ernest Rutherford (1871-1937) was a notable British physicist and chemist who made seminal contributions to the development of the modern atomic model. Through his gold foil experiment in 1911, Rutherford was able to formulate the Rutherford model of the atom, which established that atoms have a small, positively charged nucleus surrounded by low-mass electrons. For this breakthrough discovery, Rutherford received numerous honors including the Nobel Prize in Chemistry in 1908. His work fundamentally changed scientific understanding of atomic structure.
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Acceleration and force 2010
- 2. ObjectivesObjectives 1.1. Calculate accelerationCalculate acceleration 2.2. Describe acceleration on a Speed vs.Describe acceleration on a Speed vs. Time graphTime graph
- 3. AccelerationAcceleration Galileo developed this idea as wellGalileo developed this idea as well Found that balls rolling down an inclineFound that balls rolling down an incline rolled faster and fasterrolled faster and faster
- 4. CalculationCalculation Acceleration =Acceleration = Change in velocityChange in velocity timetime Change in velocity = VChange in velocity = VFF - V- VII
- 5. THEREFORETHEREFORE Acceleration is a change in:Acceleration is a change in: – SpeedSpeed – DirectionDirection – Both speed and directionBoth speed and direction A body undergoes acceleration when thereA body undergoes acceleration when there is a change in its state of motionis a change in its state of motion
- 6. Suppose we are drivingSuppose we are driving In 2 second we steadily increase ourIn 2 second we steadily increase our velocity from 30 meters per second 40velocity from 30 meters per second 40 meters per second.meters per second. Change of velocity is 5 meters per secondChange of velocity is 5 meters per second in each secondin each second Acceleration = 5 m/sAcceleration = 5 m/s22
- 7. A snail accelerates from 2 m/s to 4 m/s in 2A snail accelerates from 2 m/s to 4 m/s in 2 seconds. What is the snail’s averageseconds. What is the snail’s average acceleration?acceleration?
- 8. ForcesForces September 20, 2013September 20, 2013
- 9. ObjectivesObjectives 1.1. Explain the difference between BalanceExplain the difference between Balance and Unbalance Forcesand Unbalance Forces 2.2. Describe and calculate the relationshipDescribe and calculate the relationship between mass, acceleration, and Forcebetween mass, acceleration, and Force
- 10. Net ForceNet Force Objects don’t speed up, slow down, orObjects don’t speed up, slow down, or change direction without forcechange direction without force Net Force - All the forces taken to changeNet Force - All the forces taken to change the motion of the objectthe motion of the object
- 11. Applied Force Net ForceApplied Force Net Force 5 N5 N 5 N5 N 5 N5 N 5 N5 N 5 N5 N 10 N10 N 10 N10 N 0 N (balanced force)0 N (balanced force) 5 N5 N
- 12. Balanced ForceBalanced Force When the force on anWhen the force on an object are equal in sizeobject are equal in size and opposite directionand opposite direction Results in the objectResults in the object not moving (The forcesnot moving (The forces cancel each other out)cancel each other out)
- 13. Balanced vs. UnbalancedBalanced vs. Unbalanced Only when forces are unbalanced can anOnly when forces are unbalanced can an object be set into motionobject be set into motion
- 15. Force and AccelerationForce and Acceleration Any object that accelerates depends on aAny object that accelerates depends on a force to make it accelerateforce to make it accelerate What is the force in a free fall?What is the force in a free fall? Acceleration ~ Net ForceAcceleration ~ Net Force
- 16. If you push on a shopping cart it willIf you push on a shopping cart it will accelerate. If you apply four times the netaccelerate. If you apply four times the net force, how much greater will theforce, how much greater will the acceleration be?acceleration be? If the net force acting on a sports car isIf the net force acting on a sports car is increased by five, how much greater willincreased by five, how much greater will the acceleration be?the acceleration be?
- 17. Free FallFree Fall When air resistance doesn’t affect theWhen air resistance doesn’t affect the motion of a falling objectmotion of a falling object Free falling objects gain speed at the rate ofFree falling objects gain speed at the rate of 9.8 m/s every second9.8 m/s every second 9.8 m/s9.8 m/s22
- 18. GravityGravity Objects in free fall gain speed because ofObjects in free fall gain speed because of gravitygravity Gravity is 9.8 m/sGravity is 9.8 m/s22 What about if you throw an object up?What about if you throw an object up?
- 19. Mass and InertiaMass and Inertia The more massive theThe more massive the more Inertiamore Inertia The more FORCEThe more FORCE neededneeded OROR The less accelerationThe less acceleration
- 20. RememberRemember Mass is not WeightMass is not Weight Mass is not volumeMass is not volume Mass is the amount ofMass is the amount of matter in an objectmatter in an object
- 21. Weight is ForceWeight is Force Force due to gravity that act’s on an object’sForce due to gravity that act’s on an object’s massmass Mass doesn’t change, weight can (Moon vs.Mass doesn’t change, weight can (Moon vs. Earth)Earth) Mass is proportional to WeightMass is proportional to Weight
- 22. NewtonNewton Standard unit ofStandard unit of Weight/ForceWeight/Force Symbol – NSymbol – N F = maF = ma One kilogram WeighsOne kilogram Weighs 9.8 Newtons9.8 Newtons