Explain that people often use simple machines to make work easier. Or, you could use a simple machine to make up the difference in the force you are applying. If you use half as much force to push the book, then you will have to push the book twice as far to do the same amount of work. In this example, this means you still want the book to move from one side of the desk to the other, but you don’t want to push as hard. Imagine that you want the same amount of work to get done using less force. Ask: Is doing homework work by this definition? (No, homework is not work.) Pushing a book across a desk is work because you are applying a force (a push) on a book for a certain distance (the length of the desk). Ask: Is this work by the scientific definition? (Yes, this is work.) You are applying force for a certain distance. Ask a student to move a book from one desk to another. Work can be defined as force times distance (Work = Force x Distance). Tell the class the definition of work used in science may differ from what most people think of as work. Introduce the concept that simple machines make work easier.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |