Section 5-2.  The work done by a machine is work output. Work output = resistance force x resistance distance.  The work done on a machine is work input.

Slides:

Advertisements

Similar presentations

How do machines work?.

Advertisements

5.2 Using Machines.

Chapter 4.2 How Machines Do Work?. - How Machines Do Work Input and Output Work The amount of input work done by the gardener equals the amount of output.

HOW MACHINES DO WORK? Key Concepts How do machines make work easier? What is a machine’s mechanical advantage? How can you calculate the efficiency of.

How Machines Do Work Outline Notes Pages

Chapter 4: Section 2.  Machine- device that makes doing work easier ◦ They change the way a person does work, not the amount of work that needs to be.

 A machine is a device that makes doing work easier.  Machines can be simple.  Some, like knives, scissors, and doorknobs, are used everyday to make.

Chapter 15 Simple Machines.

Machines Machine: a device that makes doing work easier by: a. changing the amount of force needed b.the distance which force is exerted c. the direction.

Machines Do Work How do machines make work easier? A machine is a device that changes a force. Machines make work easier to do. They change the size of.

Using Machines Chapter 14 Lesson 2 432, 433, and 435

Mechanical Advantage and Simple Machines

WORK AND EFFICIENCY. WHAT IS WORK? Definition:  The use of force to move an object Not all force used to move an object does work The force must be applied.

Mathematically we define power as: The unit of power is J/s or Watts (W) (this is sometimes confusing because W is also the symbol for work) Mathematically.

Work, Machines, and Energy HS Physical Science Hull Middle School.

Chpt. 5—Work and Machines

Work and machines Machines make jobs easier. Machine – a device that helps do work by either changing the size of a force or changing the direction of.

Work Work happens when a force moves an object over a distance.

Work and Machines Chapter 5 Sec 2. What is a Machine?  Any device that makes work easier.

Machines, Mechanical Advantage and Efficiency. What is a Machine?  A machine makes work easier and more effective.  A machine never changes the amount.

Work and Machines Chapter 5 Section 1.

1 Simple Machines 2 History of Work Before engines and motors were invented, people had to do things like lifting or pushing heavy loads by hand. Using.

Section 2 Work and Machines. Machines Do Work A machine is a device that changes a force. Machines make work easier to do. They change the size of a force.

Work, Power and Simple Machines Work Distance 10 m Force 40 N W = F * d = 40 N * 10 m = 400 Joules Force acting through a distance.

Work Work: using a force for a distance W = F x d

What is a machine? A machine is a device that makes doing work easier. Machines can be simple. Some, like knives, scissors, and doorknobs, are used everyday.

Machines What is a machine? How do you calculate the M.A. and Efficiency of a machine?

Ch14 Concepts Efficiency Work Work Power Power Machines Machines 1.

14.2 Work and Machines A______________is a device that changes a force. Machines make work_______________to do. –They change the size of a force needed,

JEOPARDY – work and Simple Machines Final Jeopardy Simple Machines.

Section 4 Conservation of Energy. I. Energy Transformations PE = mgh PE = (515 kg)(9.8 m/s 2 )(70.0 m) PE = 353,290 J At the top of the hill, PE is at.

Work, Power, & Simple Machines Assistance from Derek Hinrichs.

Machines Do Work How do machines make work easier? A machine is a device that changes a force. Machines make work easier to do. They change the size of.

Mechanical Advantage vs. Mechanical Efficiency

I. Introduction to Machines Machines Force Work Mechanical Advantage

Introduction to Machines Force Work Mechanical Advantage

Simple Machines Device that makes doing work easier is a machine

Chapter 6 Work and Machines Section 2 – Using Machines

Machines Do Work How do machines make work easier? A machine is a device that changes a force. Machines make work easier to do. They change the size of.

What is the formula for power?

Sci. 4-2 What is a Machine? Pages

Using Machines.

Using Simple Machines INB Page 145.

Machines make jobs easier

What machines do for us.

Machines Chapter 15.

How Machines Do Work Chapter 12 Section 2.

Machines - Ch. 7 I. Introduction to Machines (p ) Machines

REVIEW Work is done whenever a force moves an object over a distance.

Work = when a force is applied on an object and it moves in the direction of the force.

Efficiency and Mechanical Advantage

Mechanical Advantage and Efficiency

6.2 – Using Machines.

Bell Ringer What is the formula for work?

Machines Do Work How do machines make work easier? A machine is a device that changes a force. Machines make work easier to do. They change the size of.

Work and Machines Work: is the transfer of energy that occurs when a force makes an object move For work to be done, a force must make something move.

Jillian Pardini & Hank Finch

Chapter 5.2 Physical Science WZPP ps Ok web post

Introduction to Machines Machines Force Work Mechanical Advantage

7.3 Efficiency.

Work is the transfer of energy to an object by using a force that causes the object to move in the direction of the force. * Work is measured is Joules.

Integrated Science Unit 7 - Physics

Group Members First Names

Machines - Ch. 7 I. Introduction to Machines (p ) Machines

Warm up Draw the 3 different types of levers..

Using Machines.

How Do Machines Work Chapter 4 Section 2.

Presentation transcript:

Section 5-2

 The work done by a machine is work output. Work output = resistance force x resistance distance.  The work done on a machine is work input. Work input = effort force x effort distance.

Machines cannot increase the amount of work you do so the work output can never be greater than the work input.

 Not all work put into machines is useful work. Some of the work is used to overcome friction. This work is lost as heat energy. Efficiency = work output/work input x 100. Expressed as a percentage. Always less than 100% because work output is always less than work input.