Yr+8+2.+Forces

=YR 8 Topic 2. Forces Select the online test= Levers are force multipliers or speed multipliers Mechanical advantage is the load divided by the effort. (or the distance of the effort from the fulcrum divided y the distance of the load from the fulcrum) A wheel is a bent lever that rotates around the axle (fulcrum) Gears are a special kind of wheel Pulleys can be used to reduce the effort required to lift a load. We can calculate work and Mechanical advantage || Simple machines Ramp Lever Inclined plane Screw Force Effort Load Work = force X distance Mechanical advantage = Load / Effort || Pulley wheel torque gear Lever fulcrum teeth ||  || A force is a push or a pull. Simple machines use less force or change the direction of a force. Calculate work and mechanical advantage. || * Watch this video and list all the simple machines > || # Ques 17 to 27 Science at work p 244 http://www.youtube.com/watch?v=l1Fhs8pXGxM&feature=related ||  || Levers are force multipliers (Class 1 and 2) Correctly use terms fulcrum, effort, load Levers are speed multipliers (Class 3) Calculate Mechanical advantage and work done || * Use a variety of levers and draw them to show the effort and load and fulcrum Wheels and axles Gears Calculate Mechanical advantage and work done || * Construct a table to compare Wheels as force multipliers and Speed multipliers include examples of each (p258 to 259) • Hmwk 8.5 ||  || Single pulleys change direction of a force Multiple pulleys use a small effort to lift a large load Calculate Mechanical advantage and work done || * Draw examples of single pulley systems and label the effort and load Prac 3 - p270 Prac 4 - p271 ||  || Use the things you have learnt - This is an assessment task || * [|Simple machine quiz] > you will be asked to enter your first name and last name http://www.classroomclipboard.com/490625/Home/Test/091a4d31229719d28ceaea02d65eb563#/Finished.xaml ||  ||   || 3 =Yr 8 Using Forces=
 * ==Key Concepts== || ==Vocab== || ==More Vocab== ||  ||
 * A force is a push or a pull. Simple machines use less force or change the direction of a force.
 * ==Concepts== || ==Suggested activity== || ==Extension activity== ||  ||
 * 8.1 Simple Machines
 * http://oxleylearning.org/science/2008/02/29/simple-machines/
 * [|Simple machine examples]
 * Practical 8.1 p 245
 * Questions 1 to 17
 * Hmwk book 8.1
 * For some movies and games go here [|Machine videos] - there are games and quizes and a number of videos here - be sure to scroll down the page.
 * Try this site for a simple explanation of simple machines http://www.edheads.org/activities/simple-machines/index.shtml
 * 1) try this simple machines song
 * 8.2 Levers
 * View this site and make some notes http://edhelper.com/SimpleMachines.htm
 * Draw and label examples of a Class 1 lever, a Class 2 lever and a Class 3 lever.
 * p249 Q 1 to 10
 * p250 Q 17 to 19
 * do at least 2 of the following pracs
 * Prac 1 -p251
 * Prac 2 - p252
 * Prac 3 - p253
 * Hmwk - 8.2 || # Surfing - p257
 * 1) Constructing p 257
 * 2) Watch this tv add using levers ||   ||
 * 8.3 Wheels axles and gears
 * Draw and label a gear system - see p260
 * Play with the Lego gears - new equip available, mouse trap racer, or cotton reel racer
 * Write a paragraph on how Gears can be used as a force multiplier or a speed multiplier
 * Questions p 261- 1 to 10 and Q17 and 18
 * Hmwk 8.4 || • Use the STELR Windmills to explore gearing and power output
 * 8.4. Pulleys
 * Draw examples of a multiple pulley system and label the effort and the load
 * Prac 1 p 268
 * Prac 2 p 269
 * Use the formula Work = effort force X the distance moved to calculate the work done in Prac 2 - how does this compare to the results gained fro the prac.
 * p267 Ques 1 to 10 and Q 14 and 16
 * Hmwk 8.6 and 8.7 || More on Prac 2 - What are Newtons and why are they used in this topic?
 * Putting it all together
 * [|Video of simple machines]
 * Watch these complicated machines: http://mytechnologyworld9.blogspot.com.au/2010/08/complicated-mechanisms-explained-in.html
 * Practical exam: Look at the box of kitchen utensils and tools - Construct a table to classify the items in terms of what type of machine it is and whether it multiplies speed or force. Use formula to calculate the work and mechanical advantage of one item.
 * Construction Assessment: Using the ideas you have learnt create/build a machine that combines 2 or more simple machines.
 * Use any of the following to Build our creation
 * paddle popstick,
 * toothpicks,
 * skewers
 * string
 * and some glue or sticky tape ||  ||   ||
 * .............................................. || ................................................................................................................ || ............................................. ||  ||
 * Online test || ==Online test==
 * Instructions**
 * 1) put your **class** in front of your first name (in the first field or type box) Eg 8H Sarah
 * 2) put your last name in the second field Eg ** Smith **
 * 3) put this access code in the third field 3LMU
 * 4) click this link to get to the online test
 * Go here to explore some simple machines and play a game []