1. Machines 14.1 Machines help people do work. 14.2
CHAPTER
NEW CHAPTER
Machines
the BIG idea
Machines help people do work by changing the force applied to an object.
14.1
Machines help people do work.
14.2
Six simple machines have many uses.
14.3
Modern technology uses compound machines.
CHAPTER OUTLINE
CHAPTER RESOURCES

2. 14.1 Machines help people do work.
When you use a machine to do work, there is always an exchange, or tradeoff, between the force you use and the distance over which you apply that force. You can use less force over a greater distance or a greater force over a shorter distance to do the same amount of work.
machine
mechanical advantage
efficiency
CHAPTER
RESOURCES
SECTION
OUTLINE

3. 14.1 Machines help people do work.
When you use a machine to do work, there is always an exchange, or tradeoff, between the force you use and the distance over which you apply that force. You can use less force over a greater distance or a greater force over a shorter distance to do the same amount of work.
machine
mechanical advantage
efficiency
SIMULATION
Explore the mechanical advantage of an inclined plane.
CHAPTER
RESOURCES
SECTION
OUTLINE

4. Six simple machines have many uses.
14.2
Six simple machines have many uses.
Simple machines change the size and/or direction of a force.
simple machine
lever
fulcrum
changes size
changes direction
wheel and axle
changes both
fulcrum
Input
force
Output
pulley
inclined plane
wedge
screw
CHAPTER
RESOURCES
SECTION
OUTLINE

5. Modern technology uses compound machines.
14.3
Modern technology uses compound machines.
• Compound machines are combinations of simple machines.
compound machine
wheel and axle
lever
wheel
and
axle
nanotechnology
robot
• Modern technology creates new uses for machines.
CHAPTER
RESOURCES
– Microtechnology and nanotechnology
SECTION
OUTLINE
– Robots

6. 14.1 Machines help people do work. I. Machines help people do work.
A. Machines change the way force is applied.
mechanical advantage
1. Changing the Size and Distance of a Force
2. Changing the Direction of a Force
efficiency
3. Mechanical Advantage of a Machine
B. Work transfers energy.
1. Energy
2. Work
C. Output work is always less than input work.
1. Efficiency and Energy
CHAPTER
RESOURCES
2. Increasing Efficiency
KEY CONCEPT
SUMMARY

7. Six simple machines have many uses.
14.2
Six simple machines have many uses.
II. Six simple machines have many uses.
simple machine
A. There are six simple machines.
lever
1. Lever
fulcrum
wheel and axle
2. Wheel and Axle
pulley
3. Pulley
inclined plane
4. Inclined Plane
wedge
5. Wedge
screw
6. Screw
B. The mechanical advantage of a machine can
be calculated.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY

8. Modern technology uses compound machines.
14.3
Modern technology uses compound machines.
III. Modern technology uses compound machines.
compound machine
A. Compound machines are combinations of simple machines.
nanotechnology
1. Gears
robot
2. Mechanical Advantage of Compound
Machines
B. Modern technology creates new uses for machines.
1. Microtechnology and Nanotechnology
2. Robots
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY

9. Chapter Resources Click on the items below to access resources on
CHAPTER HOME
Chapter Resources
Image Gallery
Click here to review chapter
images and animations
Review Game
Play a fun interactive
review game
Animations
Link to all the McDougal
Littell Science animations
Click on the items below to access resources on
CLASSZONE.COM
Audio Readings
Hear chapter audio readings
Resource Centers
Get more information on select science
topics
Content Review
Review key concepts and vocabulary
Standardized Test Practice
Practice state standardized tests
Math Tutorial
Review math concepts
BACK TO CHAPTER