CHAPTER 14 WORK, POWER, AND MACHINES SECTION 14.1

CHAPTER 14 WORK, POWER, AND MACHINES SECTION 14.1

CHAPTER 14 WORK, POWER, AND MACHINES SECTION 14.1

I. WORK AND POWER A. WHAT IS WORK? Work requires motion Work is a product of force and distance

Work depends on direction Work depends on direction B. CALCULATING WORK Equation: Work = Force x Distance

W= F x d Work is measured in Joules (SI unit) 1(Newton)(meters)= 1(Joule) Work - Joules (J) Force Newton's (N) Distance Meters (m) Power Watts (W) Time Seconds (s)

B. CALCULATING WORK Work = force x distance Work = 1600N x 2.0m Work = 3200(N)(m) = 3200J Imagine Isaac lifting Joseph into the air repeatedly. How much WORK does he do with each lift? He lifts Joseph 2.0m

and exerts an average force of 190 N? W = ________ x________ = _________ W= 190N x 2.0 m W = 380 N x m = 380J C. What is Power? 1.Power a quantity that

measures the rate at which work is done Power = Work /Time or P = W/T 2. Power is measured in Watts (W) 3. Watts is the amount of power that is required to do 1 Joule of work in 1 second

C. Calculating Power How much power is used if a force of 25 Newton's is used to push a box a distance of 10 meters in 5 seconds. How much power is used? P= work Work isnt given so

what time do you do? Find work first (W= F x d) W= 25N x 10m= 250 Work 250J = 50Watts time 5s

D. James Watt and Horsepower Besides a watt, another common unit of power is the horsepower

(hp) 1 (hp) = 746 watts Section 14.2 Work and Machines

A. Machines Do Work A machine is a device that changes a force. Machines make work easier They change the size of force needed, the direction of a force or the distance over which a force acts.

B. Work Input and Work Output The force you exert on a machine is called the input force. C. Work Output of a machine The force that is exerted by a machine is

the output force. SECTION 14.3 Mechanical Advantage

A. Mechanical Advantage The number of times that the machine increases an input force. 1. Actual Mechanical Advantage AMA- equals the ratio of the output

force to the input force 2. Ideal Mechanical Advantage (IMA) is mechanical advantage in the absence of friction B. Calculating mechanical advantage

MA = output /input Simple Machines 1. Simple Machines one of six basic types of machines of which all other machines are composed

The Lever Family Simple lever Pulley

Wheel and Axle Levers are divided into 3 different classes 1st class have a fulcrum in the middle of an arm. Input force acts on one end and the other end applies an

output force Second Class Lever The fulcrum is at one end of the arm and the input force is applied at the other end

Third class lever Multiply distance rather than force. As a result, they have a mechanical advantage of less than 1. ( The human body has many) Pulleys

Pulleys are modified levers The Inclined Plane Family Multiply and redirect force Ex. Apply force to push an object up a ramp, The ramp redirects force to lift the object upward

Inclined Planes 1. Wedge turns downward force into forces directed out to the sides Inclined Planes 2. Screw- an inclined plane wrapped

around a cylinder Inclined Planes 3. Inclined plane- changes both magnitude and the direction of force

Compound Machines Combines two or more simple machines I. Energy and Work Energy measured in joules Transfer energy from doing work

Ex. Slingshot

Recently Viewed Presentations

  • Android OS by the Open Handset Alliance and Google

    Android OS by the Open Handset Alliance and Google

    Android OS by the Open Handset Alliance and Google. Android supports windows, panes, 3d graphics. Connects to Wi-Fi, Bluetooth, cellular networks
  • English in Years 1 and 2  Our Aim

    English in Years 1 and 2 Our Aim

    VCOP. In years 1 and 2 these skills are presented to the children as Vocabulary, Conjunctions, Openers and Punctuation. 'Green to be seen' and 'Pink to think' are also used for children to identify skills they are using and those...
  • 10 U.S.C. §1044a Notary Certification Training USMC

    10 U.S.C. §1044a Notary Certification Training USMC

    State notaries must have their own notary seal or stamp with their name. The notary is responsible for safekeeping and destroying the seal/stamp once he/she ceases to be a notary. 10 U.S.C. §1044a. specifically exempts federal military notaries from the...
  • 16 Port T1 VCL-MegaConnect-Jr. Digital Access Cross Connect ...

    16 Port T1 VCL-MegaConnect-Jr. Digital Access Cross Connect ...

    (Digital Access Cross Connect Switch) Product Presentation Updated: March 29, 2019 Product Overview 16 Port T1 DACS It is an T1 digital cross connect switch, presents its user an easy to use, platform to cross connect up to 16 T1...
  • Todays Presentation  Use of Residential Care  Program Models

    Todays Presentation Use of Residential Care Program Models

    Thoburn and Ainsworth, 2014. Youth in Residential Care - USA. In 2014, 56,000 foster youth in residential care (14% of the U.S. foster care population) Youth in residential care 3 times more likely than other youth in foster care to...
  • Special Education 101 - Home | Oklahoma State Department of ...

    Special Education 101 - Home | Oklahoma State Department of ...

    Small group administration. ... furniture, doorways, tables and chairs. Many of these objects are in poor light or only partially shown, yet your powerful recognition networks recognized them instantly. ... Conduct a functional behavioral assessment and implement a behavior intervention...
  • Alphabet Animals - PC\|MAC

    Alphabet Animals - PC\|MAC

    Alphabet Animals In these pages you will find animals whose names begin with letters of the alphabet. Have fun! Letters A-E A alligator B birds C cat D dog E elephant Letters F-J F frog G giraffe H horse I...
  • Girlguiding Sussex Central County 540 Rainbo ws 1,609

    Girlguiding Sussex Central County 540 Rainbo ws 1,609

    Girlguiding. Anglia Region. 37% of girls stayed longer than 3 years. Brownies - 32,281. 6,474 girls joining Brownies had been Rainbows previously. This is 40% of the total joiners in the year. 16,519 Brownies left between August 2015 and 2016....