Sci. 4-2 What is a Machine? Pages 92-97.

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.

Mechanical Advantage & Effeciency. Objectives Explain how a machine makes work easier Describe and give examples of the force- distance trade-off that.

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

How Machines Do Work. What is a machine? A device that allows you to do work in a way that is easier.

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.

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

Simple Machines and Mechanical Advantage

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.

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.

Simple Machines Machines Lever Inclined plane Pulley Screw Wedge Wheel & axle.

Work and Machines What is a machine??.

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

Mechanical Advantage and Efficiency

Mechanical Advantage The measurement of how useful a machine is to the job.

Mechanical Advantage. Can be expressed as the ratio of: 1)the resistance force (i.e. the load) to the effort force required to move it 2)the distance.

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

Do Now Write a one-paragraph answer in your science journal to the following question: Why do we use machines?

Work and Machines. What is a machine? A device that allows you to do work in a way that is easier and more effective.

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.

Chapter Nine: Simple Machines  9.1 Types of Simple Machines  9.2 Mechanical Advantage  9.3 Levers in the Human Body.

How Machines do WORK A Machine – is a device that allows you to do work in a way that is easier or more effective. INPUT FORCE – is the force you exert.

Warm-up for May 19, 2015 Textbook page 215 : Numbers 3 thru 8.

Simple Machines Chapter 14. What do All These Things Have in Common?

The Mechanical Advantage of 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.

Mechanical Advantage vs. Mechanical Efficiency

Machines A device that makes work easier

I. Introduction to Machines 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.

Mechanical Advantage and Efficiency

Using Machines.

Using Simple Machines INB Page 145.

Machines make jobs easier

Chapter 14 Section 2.

What machines do for us.

Machines Chapter 15.

How Machines Do Work Chapter 12 Section 2.

Chapter 12 Work and Energy

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

Mechanical Advantage & Effeciency

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

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.

Why we use machines.

Work and Mechanical Advantage

Physical Science Work and Machines.

Mechanical Advantage and Efficiency

Goal 7 Work and Mechanical Advantage

Work & Mechanical Advantage

Group Members First Names

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

Chapter 14 Section 2.

Simple Machines & Work.

Using Machines.

Mechanical Advantage and Efficiency

How Do Machines Work Chapter 4 Section 2.

Ch 8 Energy Notes Work When the kinetic energy of an object changes, work has been done on the object. Units of work: Joules Work is a scalar quantity.

Presentation transcript:

Sci. 4-2 What is a Machine? Pages 92-97

A. Machine- a device that helps make work easier by changing the size or direction of a force.

B. The work you do on a machine is called work input B. The work you do on a machine is called work input. The work done by the machine is called work output.

C. Work output can NEVER be greater than work input. (W = F x d)

D. Force or distance can increase but not together D. Force or distance can increase but not together. When one increases, the other must decrease.

E. Mechanical Advantage- a number that tells how many times a machine multiplies force.

Mechanical Advantage Formula- Mechanical Advantage (MA) = output force/input force (MA) = Output force Input force

G. If the mechanical advantage is less than 1, that means that the input force is greater than the output force

H. Mechanical Efficiency- is a comparison of a machine’s work output with the work input. Shown as a percent (%).

Work output is always less than work input because the machine must overcome friction. J. No machine is 100% efficient because some of the work input is used to overcome friction.