Number One
Aim : to find out the direction that a freely suspended bar magnet will come to rest in.
Materials needed : A bar magnet, a retort stand, sticky, thread.
Prodecure to carry :
1) Make sure there are no magnetic or magnet objects around you.
2)Hang a bar magnet from a retort stand using a piece of tread as shown.
3) Wait for the magnet to come in a rest.
4) Use a compass to check the direction which the compass comes to rest in. It should be in the North-South direction.
5) Gently spin the magnet and wait for it to come to a rest again. It should face the same position as before.
Conclusion : A freely suspended magnet always comes to rest in the North-South direction.
Number Two
Aim : To test the hardness of each material
Materials needed : Rubber Eraser, wooden chopsticks metal nail.
Procedures to carry :
1) Think of a way to test the hardess of the objects
Way : Use the objects to sratch each other to test the hardness. the on that has no scratches is the hardest while the one with the most scracthes is the softest.
Conclusion : Hardness of an object can be tested by scratching them.
Number Three
Aim : To find out if our skin can accurately measure temperature
Materials needed : Hand, a basin of warm water, a basin of cold water and a basin of tap water.
Procedures to carry out :
1) Place your left hand into the tub of cold water
2) Place your right hand into the tub of warm water
3) After a 45 seconds, place both hands into the tub of warm water and write down what you feel.
Observations : My right hand feels cold while my left hand feels warm.
Conclusion : Our skin cannot detect temperature accurately, it only compares the temperature of the last objectand the current object. To measure the temperature accurately, we must use a thermometer.
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