679357
7
Zoom out
Zoom in
Previous page
1/62
Next page
6
A�Quick�Guide�to�Levers
• Increasethespeedtheloadmoves.
This characteristic of a lever can be seen
in the seige engines known as trebuchets
that were used to throw large stones at
castle walls in medieval times.
Figure 2 shows a large medieval trebuchet -
a giant lever in which the fulcrum is off-centre.
A massive effort is applied to move a small
load. The end of the long arm on the load
side is made to move very quickly, accelerating
the sling holding the load and propelling it
forward over a long distance. Trebuchets
caused enormous damage because they
were able to toss objects at castle walls
at speeds in excess of 160 kilometres an
hour. Fishing rods and hockey sticks use
the same principle.
Visit http://www.flyingpig.co.uk/Pages/
lever2.htm to see a trebuchet in action.
Visit http://wwwpbs.org/wbgh/nova/
lostempires/trebuchet/builds.html to see
photos of the reconstruction of a trebuchet.
Are all levers the same?
There are three basic types of lever: 1st Class,
2nd Class and 3rd Class levers. They all share
the common components of a rigid rod or
beam, fulcrum, effort and load. They differ only
in the relative positions of the fulcrum, effort
and load.
1st Class Levers
Key facts
• In a 1st Class lever the fulcrum is
positioned between the effort and the load.
 • Theeffortandloadmoveinopposite
directions. 1st Class levers, therefore, can
be used to change the direction of an
applied force. For example a downward
push on one end of the lever can result in
an upward push or pull at the other end.
 • Theeffortforcecanbeamplifiedby
increasing the length of the effort arm.
The longer the effort arm, the easier it is
to move the load.
 • Thelongertheloadorresistancearm,the
faster the load can be made to move. For
example: the trebuchet.
Fig. 2
Fig. 3
Education
®
7


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide in the language / languages: English as an attachment in your email.

The manual is 7,26 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide

Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - German - 62 pages

Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - Dutch - 62 pages

Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - French - 62 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info