Compass making
Method 1:
[Experimental materials] Waste shaving blade, plastic cup, water.
experimental procedure
(1) Magnetize the blade and mark the South Pole end of the blade with a self-adhesive strip.
(2) Fill the plastic cup with water so that the water surface forms a convex surface; Place a magnetized blade on the surface of the water to make a compass.
considerations
Since the blade floats on the surface of the water by tension, when placing the blade, the blade should be flat, the action should be light, and the surface of the blade should not have water.
Method 2:
[Experimental materials] Shaving blades, snaps (snap fasteners), latex, rubber, sewing needle, and self-adhesive strips.
experimental procedure
(1) Put the end of the needle nose down and tie it vertically in the center of the rubber to make a support.
(2) The magnetized shaving blade is marked with a self-adhesive strip at the South Pole end.
(3) Glue the snap fastener (snap fastener) to the center hole of the blade using latex.
(4) Place the blade on the pin point of the support using the snap fasteners under the blade and adjust the center of gravity of the blade so that it can rotate horizontally freely to make a compass.
Method 3:
[Experimental materials] Paper clips, snaps (fasteners), latex, pins, Plasticine.
experimental procedure
(1) Make needle base with plasticine and pin (needle tip up).
(2) Magnetized paper clips.
(3) Glue the snap fastener (snap fastener) to the center of the paper clip using latex.
(4) Use the snaps under the paper clip to place the magnetized paper clip on the pin tip and adjust the center of gravity to make the guide.
Use a compass to determine direction
[Production purpose] Preliminarily learn the method of using compass to identify the direction.
[Experimental materials] Compass projection device, projector, compass.
experimental procedure
(1) Place the compass projection device on the projector (means laying the compass flat).
(2) Wait for the compass to stop and turn, turn the chassis, so that the north-south scale line and the pointer coincide, and the South Pole of the magnetic needle is the \"south\" word on the finger disk.
(3) According to the eight direction scale on the chassis, point out eight directions.
(4) Place an object on the edge of the projector and ask students to tell the direction of the object. Have students follow the above method, using a compass or homemade compass to determine the direction of some objects around them.