Simple machines by Saliha Rais, for grade 5.

8 Jan 2015
1 sur 27

Simple machines by Saliha Rais, for grade 5.

• 1. PREPARED BY MISS SALIHA RAIS SIMPLE MACHINES
• 2. Name five machines in your daily life. Does your list matched any of these?
• 3. What is a simple machine?  A Machine is any device which helps to make work easier for us.  Tools such as a screw driver, a pair of tongs and a pair of scissors are called Simple Machines.
• 4. Types of machines Force Magnifiers Movement Magnifiers
• 5. FORCE MAGNIFIERS  Magnifier--- magnify  Machines which can overcome a large force using a small force are called Force magnifiers.  For example: Car jack.
• 6. MOVEMENT MAGNIFIERS  Movement--- distance covered  Magnifier--- magnify  Machines which provide a bigger movement from a smaller movement are called Movement magnifier or Distance multiplier.
• 7. LEVER- A SIMPLE MACHINE  A lever is a simple machine which turns about a fixed point called the Fulcrum (F) when a force called Effort (E) is applied to overcome a resisting force known as the Load (L).
• 8. TYPES OF LEVER First Class Lever Second Class Lever Third Class Lever
• 9. 1. FIRST CLASS LEVER  Fulcrum is between the effort and load.  It produce a large force from a small force (L>E).  Effort moves a longer distance than the load.  Fulcrum is further away from the effort than the load to increase the turning effect of force of the effort.
• 10.  L>E  Distance covered by effort is more.  Fulcrum is away from the effort.
• 11. EXAMPLES OF FIRST CLASS LEVER
• 12. 2. SECOND CLASS LEVER  Load is between the fulcrum and effort.  It produce a large force from a small force (L>E).  Fulcrum is further away from the effort than the load to increase the turning effect of force of the effort.
• 13.  L>E  Fulcrum is away from the effort.
• 14. EXAMPLES OF SECOND CLASS LEVER
• 15. 3. THIRD CLASS LEVER  Effort is between the fulcrum and Load.  It produce a large movement from a small movement.  The effort moves a shorter distance but the load moves a longer distance.  A large force is used to move a small load (E>L)
• 16.  Produce large movement from small movement.  Effort moves a shorter distance, but load a larger distance.  E>L
• 17. EXAMPLES OF THIRD CLASS LEVER
• 18. RAISE YOUR HANDS IF YOU WANT TO ANSWER A QUESTION! LET’S HAVE A QUICK REVIEW…..
• 19. YOU HAVE 2 MINUTES TO LEARN THIS PICTURE
• 20. NOW, Fill in the given chart. TYPE OF LEVER POSITION OF F, E AND L 1. 2. 3.
• 21. Fill in the given chart. TYPE OF LEVER POSITION OF F, E AND L First class lever F is between L and E Second class lever L is between F and E Third class lever E is between F and L
• 22. HURRY UP! REVISE AGAIN
• 23. GUESS THE CLASS OF LEVER…!  THIRD CLASS LEVER
• 24.  FIRST CLASS LEVER
• 25.  THIRD CLASS LEVER
• 26.  SECOND CLASS LEVER
• 27. JAZAKALLAH!