Chapter 15 Work. How did humans thousands of years ago build such structures as the great pyramids of Egypt?

Slides:



Advertisements
Similar presentations
What is Work? In Science, Work is accomplished when a force is moved over a distance. Work. –Lifting books, pushing a box 2 feet, pulling a wagon. Not.
Advertisements

Work Work is done only when a force moves an object.
Work in Science.
Work and Power 1. Describe the conditions that must exist
Forces & Motion Work. Work – force exerted on an object that causes it to move some distance Work = Force x Distance Force is still measured in Newtons.
Chapter 5 Lesson 1.
What is Work? Book M: Section 4.1.
Chapter 15 Power. just like the word “work”, power has a different meaning in the science world power tells you how fast work is being done.
Work is the product of the force and the distance through which the object moves W = F x d W = F x d.
W ORK AND P OWER. W ARM U P 1. Which of the liquids in the graduated cylinder below is the least dense? 2. Which is the most dense? 3. Estimate the density.
WORK.
Work.
Power Core • Relate (without calculation) power to work done and time taken, using appropriate examples Supplement • Recall and use the equation P = E/t.
Work, Power & Simple Machines
Work and Power Chapter 5!! The End of the ROAD is near…..!!
1 Work in Science. 2 What is work?  In science, the word work has a different meaning than you may be familiar with.  The scientific definition of work.
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. What is work? In science, the word work has a different meaning than you may be familiar with. The scientific definition of work is: using a force.
Chapter 8 Work. Terms to Learn Work - the action that results when a force causes an object to move in the direction of the force being applied and only.
Lesson 8. Work Work – when a force acts on an object and it moves some distance. WORK = Force (N) x Distance (m) L 8.
Work. What do you think of when you think of work? You probably think of…
 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 and Machines What is Work?. The Meaning of Work you exert a force on the object that causes the object to move some distance In science, you do work.
1.  Read each slide carefully.  Record notes on notebook paper.  Give your notes a title: “Work Notes”  Write the title of each page in which you.
Bell Ringer Write down this question on your paper and answer Hitting a ball with a tennis racket is work because ____________.
The weight lifter applies a large force to hold the barbell over his head. Because the barbell is motionless, no work is done on the barbell.
1 Work and Simple Machines. 2 What is work?  In science, the word work has a different meaning than you may be familiar with.  The scientific definition.
 Energy, Work and Simple Machines  Chapter 10  Physics.
1. Title: Power of a Motor Power of a Motor 2. Date: Today’s Date 3. Names: Team members and cooperative jobs. Team members and cooperative jobs.
Work.
What is Work?. Work Demo One student pushes against the wall. One student pulls up a set of keys Who does more work? Why? Who was applying more force?
Chapter 5 Lesson 1. Interactive Notebook Title: Work Work= transfer of energy that occurs when a force makes an object move For work to be done, something.
A force of 15 newtons is used to push a box along the floor a distance of 3 meters. How much work was done in this situation?
Work.  Lifting books out of your backpack?  Carrying your backpack to class?  Pushing a car that is stuck in the snow?  Rolling a bowling ball? What.
1 Work and Intro to Energy. OPENER: ( 5 min) 1. Turn to the next available page in your journal 2. Write the date: 3. Write the word ENERGY in LARGE letters.
1. What is work? In science, the word work has a different meaning than you may be familiar with. The scientific definition of work is: using a force.
Drills on WORK. An ice skater glides for two meters across ice.
Work.
WHAT IS WORK?. Work when you exert a force on an object that causes the object to move some distance Work is done when the object moves in the same direction.
Work and Power. What is force? A force is a push or a pull.
Work  When a force causes an object to MOVE in the DIRECTION of the force.  Calculated using the equation:  Force x Distance  F x d  Units  Newton.
Work, Power, and Simple Machines. What is Work?  The scientific meaning of work is a force acting through a distance.  Force must be in the same direction.
Section 14 Work, Power, and Energy. More Power!!!!! What does he mean?
Calculating Work. Work = force x distance W=f x d Unit of Measurement for Work is Joules Unit of Measurement for Force is Newtons Unit of Measurement.
Understanding and Calculating Work Work - When a force acts on an object and causes it to move through a distance, energy is transferred and work is done.
In this section you will use the equation to calculate work done use the equation to calculate kinetic energy solve simple energy interchange problems.
Work  Work occurs when: 1.An object moves when a force is applied 2.The direction of the objects motion is the same as the direction of the force Formula:
Work Whoa!!! Now I do!!!  I just don’t have any energy 
Work and Power Calculations
What is Work? Work – The product of force and distance when a force moves an object a distance. In order for you to do work on an object, the object must.
Work.
1. Amy uses 20 N of force to push a lawn mower 10 meters
How much work is done when a boy carries a 30N bag?
Work.
Work, force, motion, and power
Work, Power, and Mechanical Advantage Review
Calculating Work 4/9/2019 Calculating Work.
Chapter 7 Work.
Work Work is an amount of force applied to an object making it move a certain distance *If an object doesn’t move, no work is done.
7.1 Work.
What is work Chapter 4 section 1.
Work.
WORK.
Work.
Science 9 Chapter 5: Work and Machines Chapter 6: Thermal Energy
Work.
Work.
Sci. 4-1 Work and Power Pages
Physical Science Chapter 5
Work Work the transfer of energy using a force that causes the object to move in the direction of the force.
Presentation transcript:

Chapter 15 Work

How did humans thousands of years ago build such structures as the great pyramids of Egypt?

Work the force that is applied to move an object the direction the object moves must be in the same direction as the force applied if the object doesn’t move, then no work has been done

Examples Pushing against a wall -– no work has occurred because the object doesn’t move Lifting a bag of groceries –- work is done Carrying a bag of groceries – no work is being done

Examples Pushing a car Lifting a baby Carrying a baby Throwing a baseball Pushing against the floor Hammering a nail

How to Calculate Work Work = Force * Distance Units are defined as a joule (J) or a Newton*meter

Problem You lift a box that weighs 200 Newtons a distance of 0.5 meters. How much work is done?

Procedure Write the equation Figure out what is being asked – what are you solving for? Determine what information is given Plug & Chug – don’t forget the units!

Step One Write the equation Work = Force * Distance

Step Two Figure out what is being asked – what are you solving for? How much WORK is done?

Step Three Determine what information is given Box weighs (force) 200N Distance box moves = 0.5m

Step Four Plug & Chug – don’t forget the units! Work = (200N)(0.5m) = 100 N*m or = 100 J (joules)

You Try One! A 900N mountain climber scales a 100m cliff. How much work is done by the mountain climber?