SES194 Energy in Everyday Life / Physics
SES194 Energy in Everyday Life / Physics SES194
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This 5 page Class Notes was uploaded by Sarah Booth on Tuesday September 20, 2016. The Class Notes belongs to SES194 at Arizona State University taught by Frank Timmes in Fall 2016. Since its upload, it has received 27 views. For similar materials see Energy in Everyday Life in Business at Arizona State University.
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Date Created: 09/20/16
SES194 Energy in Everyday Life Unit 1 What is energy? Energy is the operation, efﬂux or activity of any being: as the light of the Sunne is the energy of the Sunne, and every phantasm of the soul is the energy of the soul. -Energy lights our cities. -It powers our cars, trains, planes, ships, rockets. -It warms our homes and cooks our food. -Powers machinery in factories and tractors on farms. -Energy from the Sun gives us light during the day. -It dries our clothes (hanging outside on a clothes line). -Solar energy helps plants grow. -Energy is transferred through the food chain. -Everything we do is connected to energy in one form or another. -Energy is the ability to do work. vs. -Work is the transfer of energy. Sarah Booth SES194 Energy in Everyday Life Unit 1 Kinematics -Distance is a familiar quantity.We measure distances with tape measures, odometers, or other measuring devices. Distance measures how far away things are. -Displacement, adds information about the direction to how far away something is. -Displacement is distance, not necessarily how you get there. -The extra information about direction, essential for everyday life, distinguishes quantities known as “vectors” from quantities speciﬁed only by numbers. -Vectors have a direction and a numerical value. Sarah Booth -Distance is just a number.When both the distance and direction from one location and another location are speciﬁed, it is a displacement. Speed = distanced traveled time to travel that distance -Speed is scalar - just a number. -Velocity is a vector. Specifying a velocity gives the speed and direction of that speed. Velocity = displacement time to travel that displacement -Acceleration is a measure of how rapidly a velocity changes. Acceleration = change in velocity time to change the velocity -Acceleration is a vector.We specify the numeric value of the acceleration and the direction of the change in velocity. Sarah Booth SES194 Energy in Everyday Life Unit 1 Dynamics -A force is generally known as a push or pull. -If you apply force to something, you change a state of rest into a state of motion, or change the state of that motion. -An agent that acts to change a body’s motion is called a force. -There is always a direction associated with a force therefore, force is a vector quantity. -Newton’s ﬁrst law deﬁnes force by telling us it is the age responsible for a change in the motion of an object. -An object at rest remains at rest. -An object in motion remains in motion, along a straight line at a constant speed, unless acted on by a force. -A mass is a ﬁxed quantity of matter. -The weight that a mass feels depends on the forces acting on the mass. -Mass has units of kilograms (kg). Sarah Booth -A weight has units of force (N). Example The average US adult male has a mass of 81 kilograms (kg). In Earth’s gravitational ﬁeld this mass has a weight of 794 N (or 178 lbs) but on the surface of the moon this same mass has a weight that is 6 times less. -Both the mass and the strength of a force inﬂuence the subsequent acceleration. -This is just Newton’s 2nd Law: In the presence of a net force, an object experiences an acceleration: Force = mass x acceleration -A force is in the direction of the change in motion, not the direction of motion. Sarah Booth
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