Rubbing wool on the ball transfers electrons (negatively charged) from the wool to the ball. The excess charge builds up and produces static electricity.
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If the ball is lighter than the hard ball, then it is because a heavier ball has more force when moving at the same speed as a lighter ball. If they weigh the same, then it is because in some instances, with certain materials, a hard ball with a lot of "ping" to it will bounce further than a rubber ball, due to motive energy being converted to heat in the polymers of the rubber ball, thus decreasing the total motive energy.
A smooth rubber ball spins easier in water than a tennis ball due to differences in surface texture and friction. The smooth surface of the rubber ball creates less resistance against the water, allowing for smoother rotation. In contrast, the fuzzy surface of a tennis ball increases drag and turbulence, making it harder for the ball to spin efficiently in water. Additionally, the weight distribution and density of the rubber ball may also play a role in its ease of spinning compared to a tennis ball.
It all depends on what surface it bounces on.Either the ball or the surface changes shape. A rubber ball changes it's shape, but a marble changes the shape of the surface it bounces on. And if the change is only temporary, it snaps back to it's original shape, and the ball bounces.But some energy is lost in the process, and the ball bounces lower each time.Generally a hard surface will make a hard ball bounce higher, since they hardly change shape, and they keep more of their energy. So on an ideal surface a marble would bounce higher than a rubber ball, as long as it doesn't break.Check out liquid metal: http://www.liquidmetal.com/media/ball_bounce_DSL.wmvSkrommel
Well there are quite a lot of variables-factors- that can effect the height of a dropped ball..........such as...........the weight of the object, or ball droppedthe height in which the ball was dropped fromthe materials that make up the ball( for instance, if it were a bouncy rubber ball, then it would effect the ball's rebound)the surface that the ball hit(like if it were a slanted surface the ball would launch diagonally and wouldn't go as high)and also the force in which the ball was thrown or dropped could possibly affect the ball's rebound.
A turkey wishbone will turn to rubber when placed in vinegar because the vinegar dissolves the calcium. Calcium is what makes a bone hard.