simple machines & work - mrs. bhandari's grade...
Post on 06-Mar-2018
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Work - The Key Ideas
•Energy can be applied to matter.•Matter can be moved with force.•Mechanical advantage is the factor by which a machine multiplies the force put into it.
Work - Common Misconceptions
•Power is the same as force or work.
Reality: Power is the rate at which work is done.•The terms energy and force are interchangeable.
Reality: Energy is the capacity to do work, while force is a push or a pull that can cause an object to move or stop.
Work - Using DE Science Content
•Video Segment: Work, Force, and Energy•Exploration: Tote those Books•Interactive Video: Work and PowerVideo Segment: Work Defined
Work Review
Mechanical Advantage
Video - Mechanical Advantage
Video 2 - Mechanical Advantage
Reading passage
Simple Machines —The Key Ideas
• They all provide mechanical advantage• Can be used in a system.• Simple machines can be connected together in systems to
form complex machines.
Simple Machines—Prior Knowledge
Students often think of large, loud machines, but simple machines also provide mechanical advantage.
Review the Exploration Types of Simple Machines.
Simple Machines—Common Misconceptions
• A machine makes less work for people. – Reality: A machine does not decrease the amount of
work. Instead, a machine makes work easier by changing the size or direction of the force.
• A machine must have a motor. – Reality: A machine is a device that transmits and
modifies force. Such simple machines include the lever, inclined plane, wheel, pulley, wedge, and screw.
Lever—Using DE Science Content
• Resource 1, Video Segment: Lever• Resource 2, Video Segment: Three Classes of Levers• Resource 3, Exploration: Lever Ups and Downs• Resource 4, Interactive Video Segment: The Six Simple
Machines
Lever Information
Wheel & Axle - Using DE Science Content
•Video Segment: Wheel and Axle
•Reading Passage: Wheel and Axle
•Interactive Video Segment: The Six Simple Machines
Wheel & Axle Information
Wheel & Axle Misconception
A wheel makes less work for people.
Truth: In fact, a machine does not decrease the amount of work. Instead, machines such as the wheel and axle make the work easier by changing the size or direction of the force that needs to be applied.
Pulley - Using DE Science Content
•Video Segment: The Pulley•Image: Pulleys•Exploration: Pulleys at Work•Interactive Video: The Six Simple Machines
Pulley Information
Pulley - Common Misconception
Misconception: Pulleys always increase the amount of force
In fact, fixed pulleys do not increase the effort force; they only redirect it. Only moveable pulleys magnify the effort force.
Inclined Plane - Using DE Science Content
•Resource 1, Video Segment: Inclined Plane•Resource 2, Video Segment: The Inclined Plane and the Wedge•Resource 3, Interactive Video Segment: The Six Simple Machines
Inclined Plane
More information - Click on the inclined plane
Inclined Plane - Common Misconception
Misconception: An inclined plane means less work is used.
In fact, machines to not reduce the amount of work required. What they do is contribute to the input force or change its direction so that the input force required by people is reduced.
Wedge - Using DE science content
•Video Segment: Wedge•Video Segment: Apple Peeler•Interactive Video Segment: The Six Simple Machines
Wedge Information
Interactive wedge
Wedge Common Misconception
Misconception: A wedge is only used for things like door stops.
Fact: A door stop is a kind of wedge that pushes two things apart. However, wedges can also be used to split things. Any object with a cutting edge is considered a wedge.
Screw - Using DE Science Content
•Video Segment: Screw•Reading Passage: Screw•Video Segment: The ScrewInteractive Video Segment: The Six Simple Machines
Screw
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