eagy kinetic energy expt
It's an exercise and energy experiment, but it's also an area that students who aren't good at do not want to do. When it comes to high school physics, most students give up. Isn't it the cause of dislike of science? This time, I will introduce an experiment that is not an accurate experiment, but somehow understands the principle.
Experiment 1: Kinetic energy is proportional to mass and potential energy is proportional to height
you need : Large and small bouncy balls, 3 x 8 cm paper, cellophane tape, scissors
Prepare the ingredients. Make a cylinder larger than a small ball, attach cellophane tape, and make a notch.
Attach the cylinder to the large ball. If you put a small ball in a cylinder and drop it from above, the small ball inside will pop out. This is because the energy of the big ball is transmitted to the small ball. A ball that is twice as large in diameter will have eight times the mass, so it will also have eight times the energy. When dropped from a height of 10 cm, a small ball will bounce 80 cm. In reality, not all energy is transmitted, so 80 cm does not fly. Also, if you attach a straw rocket as shown in the picture, the mass is light, so it will fly higher. Experiment by changing the height and mass.
Experiment 2: The one that has fallen freely and the one that has been horizontally ejected fall at the same time.
The movement of the horizontal component is not related to the fall of the object. It is an experiment to experience that.
you need : Disposable chopsticks, cardboard 3 x 7 cm, 2 same coins
Chop the cardboard, fix it with scissors, and place two coins as shown in the figure. Then pull horizontally to drop two coins. One is free fall directly below and the other is horizontal injection. At the same time, there is a sound of falling to the ground. Complicating this is high school physics monkey hunting.
Experiment 3: Confirm the relationship between the time and distance of the free fall motion when there is no recording timer.
This experiment was prepared to incorporate the experiment into physical falling motion in Ethiopia without a recording timer.
Attach coins to the strings. There are four positions to attach: 0 cm, 19.6 cm, 78.4 cm, and 176.4 cm. When hung as shown in the figure, the drop position is 0 seconds, 0.2 seconds, 0.4 seconds, and 0.6 seconds. Suspend this in the opposite direction and lift the 0 cm coin slightly above the ground to drop it. Place an iron plate underneath. You will hear the sound of four coins hitting. You can hear them at about the same intervals. From this, we confirm the relationship between the distance and time of free fall. If you increase the number of coins, the sound will gradually become out of sync due to air resistance.