Presentation is loading. Please wait.

Presentation is loading. Please wait.

AIM: How do we define and calculate work and power? OBJ: Given notes and activity sheet SWBAT define and calculate work and power with 70% accuracy DN:

Published byClara Walton Modified over 8 years ago

Similar presentations

Presentation on theme: "AIM: How do we define and calculate work and power? OBJ: Given notes and activity sheet SWBAT define and calculate work and power with 70% accuracy DN:"— Presentation transcript:

1 AIM: How do we define and calculate work and power? OBJ: Given notes and activity sheet SWBAT define and calculate work and power with 70% accuracy DN: Distribute ACT: HW:

2 What is Work? Work occurs when you exert a force on an object that causes the object to move some distance. In addition, the object must move in the same direction in which the force is exerted. More simply put: work unit = joule (J); where 1J = 1Nm Work(J) = Force (N) X Distance (m) Remember : work is done on an object when: 1] An object moves a distance. 2] Force is exerted on the object, and 3] The force and motion direction are parallel (same). Carrying an object = no work

3

4 Work Problem How much work is done given a force of 20N and a distance of 10 meters? W = F x D W = 20N x 10m W = 200 Nm = 200J

5

6 What is Power? Power: the rate at which work is done. Power = Work (J) = Force (N) x Distance m)Time (s) Power Unit: J/s or Watt (W), where 1W = 1 J/s One kilowatt (kW) = 1,000 Watts One horsepower = 746 watts

7 Power Problem A tow truck exerts a force of 11,000N to pull a car out of a ditch. It moves the car a distance of 5 m is 25 seconds. What is the power of the tow truck? Power = Force x Distance Time Power = 11,000N x 5m = 55,000Nm = 2,200J/s25s = 2,200 W = 2.9 hp

8

Download ppt "AIM: How do we define and calculate work and power? OBJ: Given notes and activity sheet SWBAT define and calculate work and power with 70% accuracy DN:"

Similar presentations

Work, Power, and Simple Machines

Work, Power, and Simple Machines
Work, Power, & Energy Chapter 12 and 13.

Work, Power, & Energy Chapter 12 and 13.
14-1 cornell p. 412 What is work Calculating work What is power?

14-1 cornell p. 412 What is work Calculating work What is power?
Chapter 5 Work and Machines.

Chapter 5 Work and Machines.
Work.

Work.
Unit 5-1: Work and Power. Work When we were looking at force, we observed that an objects motion is related to how the force acts and how long it acts.

Unit 5-1: Work and Power. Work When we were looking at force, we observed that an objects motion is related to how the force acts and how long it acts.
Chapter 7 Work and Kinetic Energy. Units of Chapter 7 Work Done by a Constant Force Kinetic Energy and the Work-Energy Theorem Work Done by a Variable.

Chapter 7 Work and Kinetic Energy. Units of Chapter 7 Work Done by a Constant Force Kinetic Energy and the Work-Energy Theorem Work Done by a Variable.
Work, Power & Simple Machines

Work, Power & Simple Machines
Tuesday, September 29, 2009 In olden days, something was only considered “doing work” if you were getting tired or sweaty doing it. Make up a definition.

Tuesday, September 29, 2009 In olden days, something was only considered “doing work” if you were getting tired or sweaty doing it. Make up a definition.
Work & Power Physics 2009. Work In Physics, Work is done when a force moves a body through a distance. WORK = Force x Displacement.

Work & Power Physics Work In Physics, Work is done when a force moves a body through a distance. WORK = Force x Displacement.
Work and Power Work is the transfer of energy that results from applying a force over a distance –if nothing moves, no work was done unit of measurement.

Work and Power Work is the transfer of energy that results from applying a force over a distance –if nothing moves, no work was done unit of measurement.
In this chapter you will:  Recognize that work and power describe how the external world changes the energy of a system.  Relate force to work and explain.

In this chapter you will:  Recognize that work and power describe how the external world changes the energy of a system.  Relate force to work and explain.
Work & Power.

Work & Power.
Work, Power, and the Basics of Energy. Work Work – Exerting force in a way that makes a change in the world. Throwing a rock is work: you’re exerting.

Work, Power, and the Basics of Energy. Work Work – Exerting force in a way that makes a change in the world. Throwing a rock is work: you’re exerting.
POWER Power – Power = P = ___=___ Units = ( ) = ____ = ___ Sample Problem: A crane lifts an 8000 N beam 75 m to the top of a building in 30 s. How much.

POWER Power – Power = P = ___=___ Units = ( ) = ____ = ___ Sample Problem: A crane lifts an 8000 N beam 75 m to the top of a building in 30 s. How much.
 Every day we do work. Many days we also don’t do work.  Work is defined as a the product of force and the distance the object moves. Work = Force ×

 Every day we do work. Many days we also don’t do work.  Work is defined as a the product of force and the distance the object moves. Work = Force ×
Work What is work? Is the product of force and distance. When a force acts on an object in the direction the object moves. Some of the force has to cause.

Work What is work? Is the product of force and distance. When a force acts on an object in the direction the object moves. Some of the force has to cause.
Work, Kinetic Energy, and Power. v f 2 = v i 2 + 2ad and F = ma v f 2 -v i 2 = 2ad and F/m = a v f 2 -v i 2 = 2(F/m)d Fd = ½ mv f 2 – ½ mv i 2 Fd = Work.

Work, Kinetic Energy, and Power. v f 2 = v i 2 + 2ad and F = ma v f 2 -v i 2 = 2ad and F/m = a v f 2 -v i 2 = 2(F/m)d Fd = ½ mv f 2 – ½ mv i 2 Fd = Work.
Work and Power. What does work mean to you? In physics, work has a very specific meaning. It is the action to make things change Work= force x distance.

Work and Power. What does work mean to you? In physics, work has a very specific meaning. It is the action to make things change Work= force x distance.
In your notebooks – define the terms work and joule. You do not have to do a vocabulary square on them. They can be found in chapter 12, sec. 1. February.

In your notebooks – define the terms work and joule. You do not have to do a vocabulary square on them. They can be found in chapter 12, sec. 1. February.

Similar presentations

Ads by Google