EVS CH-11 SIMPLE MACHINES( NOTEBOOK AND WORKBOOK EXERCISE)

CH- 11 SIMPLE MACHINES( NOTEBOOK EXERCISE)

NEW WORDS

1.inclined

2.rigid

3.fulcrum

4.axle

5.groove

6.wedge

7.cylindrical

8.lever

9.screw

10.pulley


NEW TERMS

1.inclined – sloping

2.rigid – non-flexible


Name the type of simple machine that can be used for doing the following activities. 

a. To load a truck with boxes of goods.  INCLINED PLANE

b. Cut a fruit.  WEDGE

c. Opening a door using a doorknob.  WHEEL AND AXLE

d. Opening a bottle using a bottle opener.  CLASS 2 LEVER

 e. To catch a fish using a fishing rod.  CLASS 3 LEVER

Answer the following questions. 

a. What are simple machines? 

ANS. A machine is a tool that helps us move a load by applying less force. The force applied is called effort.

b. What is a screw? 

ANS. A screw is a simple machine which is a modified inclined plane that winds around a cylindrical core to form a spiral. 

Nuts and bolts, and grooves on a jar are examples of the simple machine screw.

c. Why a wheel cannot be used as a machine without an axle? 

ANS. A piece of rod passing through the centre of a wheel is called an axle. The axle supports the wheel and allows the wheel to turn on the same axis. Without an axle, a wheel cannot be used as a machine.

d. Give an example in the human body where a class- one lever is found.

  • ANS. An example of a class one lever is the joint between the skull and the vertebral column. 
  • The vertebral column is the fulcrum. 
  • When you nod, the neck muscles at the back of the skull provide the force (effort) to lift your head up against the weight of the head (load). 
  • When the neck muscles relax, your head nods forward.

LINK TO WORKBOOK EXERCISE






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