Work.

Slides:



Advertisements
Similar presentations
PHYS16 – Lecture 15 Work and Energy October 13, 2010.
Advertisements

Work. Hard Work?  True or false, did you do work on the object listed? You hold a book in one hand while standing for 10 minutes.You hold a book in one.
Calculating Work. The Joule  Work is force acting over a distance, and has units equal to units of force times units of distance. With 1-dimensional.
Work and Energy Work done by a constant force Work-Energy Theorem and KE Gravitational Potential Energy Conservative Forces vs Non- conservative Forces.
Work and Power. Objectives 1.The student will investigate and understand the interrelationships among mass, distance, force and time through mathematical.
Work F The force, F, pushes the box for a short distance. This causes the box to start moving!!!!!! It gains energy!!!! I just don’t have any energy 
Work The displacement of an object in a parallel direction to an applied force. F d W=Force x displacement Work is measured in Joules (J) which comes from.
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. Energy has the ability to do work; it can move matter. Work may be useful or destructive. Introduction.
Mechanics Topic 2.3 Work, Energy and Power. Work A simple definition of work is the force multiplied by the distance moved However this does not take.
Work has a specific definition in physics. Work is done anytime a force is applied through a distance.
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.
Conservation of Energy ► Energy  Work ► Kinetic and Potential Energy  Conservative and non-conservative forces  Other forms of energy.
Work and energy. Objectives 1.Recognize the difference between the scientific and the ordinary definitions of work. 2.Define work, relating it to force.
Definitions ! Forces and Motion. Acceleration ! Acceleration is the rate of change of velocity, with respect to time. Velocity ! Velocity is the rate.
Chapter 7 Work and Energy HW5 due on Monday 12 instead of Friday 9. Study Guide will be posted on Friday 9.
Work is defined as the transfer of energy from one body to another. Or more rigorously:
Work Work is a scalar quantity and has the following conditions: a force must be exerted on an object the object must be displaced by the force at least.
WORK A force that causes a displacement of an object does work on the object. W = F d Work is done –if the object the work is done on moves due to the.
Work and Energy. Scalar (Dot) Product When two vectors are multiplied together a scalar is the result:
Work, Energy and Power Ms Houts AP Physics C Chapters 7 & 8.
Work and Energy January 30, 2009 Michael F. McGraw, Ph.D.
Chapter 5 Work and Energy. Mechanical Energy  Mechanical Energy is the energy that an object has due to its motion or its position.  Two kinds of mechanical.
Work is only done by a force on an object if the force causes the object to move in the direction of the force. Objects that are at rest may have many.
Aim: How can we apply work- energy to motion problems? Do Now: In your own words, what does energy mean to you? In your own words, what does energy mean.
Energy and Work. Energy  Energy – the ability to produce a change in itself or the environment.  If an objects position is changing, that may indicate.
Work is a Scalar Quantity +ve Work -ve Work energy transferred to the object energy transferred from the object.
Energy and Work. Work… Work = Force // x Displacement W = F // x d ** Remember that displacement is the distance AND direction that something moves. It.
Work, Power, Energy. Work Concepts Work (W) ~ product of the force exerted on an object and distance the object moves in the direction of the force. –W.
Vectors and Scalars.  A scalar is a number which expresses quantity. Scalars  may or may not have units associated with them.  Examples: mass, volume,
Three things necessary to do Work in Physics:
Recognize the difference between the scientific and ordinary definitions of work. Define work by relating it to force and displacement. Identify where.
Work is a Scalar Quantity +ve Work -ve Work energy transferred to the object energy transferred from the object.
Work Whoa!!! Now I do!!!  I just don’t have any energy 
Work.
Unit 6 Notes Work, Enery, & Power.
WORK And Energy and Power.
Work – review from gr 11 Units - Joules (J) = Nm = kgm2s-2
Chapter 7 Kinetic Energy and Work 第7章 動能與功
Work.
Work, Energy & Power AP Physics.
KINETIC ENERGY AND WORK
Work and Energy SPH3U.
How to calculate a dot product
Section 1 Work Chapter 5 Objectives
Work, Energy & Power AP Physics B.
Review: Work and Energy
Vectors Vectors are a way to describe motion that is not in a straight line. All measurements can be put into two categories: Scalars = magnitude Vectors.
Work, Energy, and Power.
The Work Energy Principle
Work is only done by a force on an
Acceleration A measure of how quickly the velocity of something is changing. It can be positive if the object is speeding up or negative if it is slowing.
Work.
Energy, Work & Power WORK.
Unit 5 Work, Power, and Energy.
Energy (NRG).
Ch. 15- Vectors in 2-D.
Work, Power, Energy.
Work, Energy & Power Honors Physics.
Work.
Work, Energy & Power AP Physics B.
Chapter 5 Pgs
Vectors.
Work, Energy & Power Physics.
Work is measured in Joules (J)
Distinguish between scalars & vectors Add and subtract vectors
Work and Energy Chapter 5 Physics.
Accelerating Objects (13.1)
Concept of Work.
Physics 2 – Jan 10, 2019 P3 Challenge–
Presentation transcript:

Work

Definition (p199) Energy is defined as the ability to do work In Physics, we must define work simply as the product of force and displacement. Work = Force × displacement W = F × d

When is work done? When we do work, it is done on an object. If an object does not move through some displacement, then no work is done on that object. In the same way, if there is no force acting on the object, there is no work. Symbol: W Units: Nm which is called a Joule

Special notes: part 1 (p200) When an object is lifted at constant velocity, work is done against gravity. In this case W = Fd or W = magh The force used in the formula, W = Fd, is the applied force rather than the ΣF (net force). Although work is a product of two vector quantities, it is a scalar quantity.

Special notes: continued When the force is not in the same direction as the displacement, we must use the component of the force that is in the direction of the displacement. (See example 4 p 201) Work can be negative. If the force on the object is in the opposite direction to the motion, the work done on the object is negative.

See example problems p 201 d = 0 and since W = Fd, W = 0 4. W = Fd or W = Fxdx: 5. Note this question requires 3 steps/formulae

Work Graphs (add to top of p 201) The area under a F/d graph is work:

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.