Materials: large tablecloth large Procedures: 1. Ask your family members to fightly hold the corners of a large tablecloth or sheet. 2. Place a heavy object such as a stone in the center of the cloth. This makes the center of the cloth bend downward. 3. Roll a marble so that it spirals around the stone. Observe what happened. 4. Change the speed and the initial angle of the marble as you roll the marble on the cloth. Record what you have observed. 5. Replace the heavy stone with a lighter stone in the center of the tablecloth and roll the marble again. Observe the movement of the object compared with the previous observations. 6. Replace the marble with other round objects like table tennis ball, small ball bearing and the like. Observe the movement happened. 7. Record your observation on the table. the movement​