Introduction:
The efficiency of an ideal machine is 100% because the input work equals the output work. However, real machines do not achieve an efficiency of 100% because heat may be lost from the system do to the friction between moving parts. An important way to improve the efficiency of a machine is to reduce friction. For example, a pulley with a rope running over a wheel is more efficient than a pulley where the rope only runs over a bar. The spinning wheel in the first example reduces friction and makes the machine more efficient.
Task:
• Students will look at how the various simple machines that comprise complex machines work together to make a more efficient machine.
• Students will explore and research which classes of levers are in common tools or complex machines.
• Students will investigate the difference in mechanical advantage within each class of simple machines (ex. pulley, double pulley, etc.).
• Students could research and apply their knowledge to a project where they present information they've learned using Web tools.
Standards:
6-5.7 Explain how the design of simple machines (including levers, pulleys, and inclined planes) helps reduce the amount of force required to do work.
6-5.8 Illustrate ways that simple machines exist in common tools and complex machines.
DAY 1:
Read the article: Click HERE to read about Simple and Complex Machines. Take whatever notes you feel necessary to be familiar with the topic.
Introduction: ACTIVITY: Write down, in your own words, what you think is a simple definition of the following terms:
1.Lever
2.Pulley
3.Inclined plane
4.Screw
5.Wedge
6.Wheel & Axle
ACTIVITY: Now watch the videos below by clicking on the words and provide a more thorough definition for each. Take notes in your notebooks or your ISN. Be sure to have on your headphones to listen to the videos.
Lever
Pulley
Inclined Plane
Screw (See the Inclined Plane Video)
Wedge (See the Inclined Plane Video)
Wheel & Axle
DAY 2:
Levers come in Three Classes: Class 1, Class 2, and Class 3. ACTIVITY: Using the picture of the Classes of Levers below, try to name at least two practical everyday items or tools that fit into each class.
The efficiency of an ideal machine is 100% because the input work equals the output work. However, real machines do not achieve an efficiency of 100% because heat may be lost from the system do to the friction between moving parts. An important way to improve the efficiency of a machine is to reduce friction. For example, a pulley with a rope running over a wheel is more efficient than a pulley where the rope only runs over a bar. The spinning wheel in the first example reduces friction and makes the machine more efficient.
Task:
• Students will look at how the various simple machines that comprise complex machines work together to make a more efficient machine.
• Students will explore and research which classes of levers are in common tools or complex machines.
• Students will investigate the difference in mechanical advantage within each class of simple machines (ex. pulley, double pulley, etc.).
• Students could research and apply their knowledge to a project where they present information they've learned using Web tools.
Standards:
6-5.7 Explain how the design of simple machines (including levers, pulleys, and inclined planes) helps reduce the amount of force required to do work.
6-5.8 Illustrate ways that simple machines exist in common tools and complex machines.
DAY 1:
Read the article: Click HERE to read about Simple and Complex Machines. Take whatever notes you feel necessary to be familiar with the topic.
Introduction: ACTIVITY: Write down, in your own words, what you think is a simple definition of the following terms:
1.Lever
2.Pulley
3.Inclined plane
4.Screw
5.Wedge
6.Wheel & Axle
ACTIVITY: Now watch the videos below by clicking on the words and provide a more thorough definition for each. Take notes in your notebooks or your ISN. Be sure to have on your headphones to listen to the videos.
Lever
Pulley
Inclined Plane
Screw (See the Inclined Plane Video)
Wedge (See the Inclined Plane Video)
Wheel & Axle
DAY 2:
Levers come in Three Classes: Class 1, Class 2, and Class 3. ACTIVITY: Using the picture of the Classes of Levers below, try to name at least two practical everyday items or tools that fit into each class.
QUIZLET - Click HERE to go to the Quizlet and practice learning the terms for this unit. There are 25 terms on this Quizlet.
Your teacher may assign you a project or presentation for this unit.
Your teacher may assign you a project or presentation for this unit.