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Crash Test Dummy Teaches the Importance of Wearing a Seatbelt

In this activity, students pushed cars with crash test dummies into a barricade. They changed the starting distance and speed of the car and recorded the results of each crash. They learned that the faster a car is moving, the farther the dummy travels if he is not wearing a seatbelt. The experiment was repeated with a seat belt but this clip shows illustrates why a seat belt is so important for a passenger in a moving vehicle.

The Physics of Sound & Water

For this experiment, the North Branch Science Club was interested to see exactly how the hertz (frequency, equal to one cycle per second) and amplitude would affect the movement of water coming out the tube. After several trials, we decided it would be easier to measure and collect data from the tube rather than the flowing water, due to so many variables. We could then predict how the water should theoretically behave once it left the tube. 1 - We measured from the starting point in one cycle of the de Broglie wave which was in the form of the tube. We measured in one direction, then measured again, 90 degrees from that direction. This formed an imaginary right triangle with two legs: 1/16 inches and 3/16 inches. All that was left to be found was the real distance travelled by the tip of the tube, which would be double the amplitude. 2 - We used Pythagorean theorem to find the hypotenuse length, the real distance travelled. It came out to be √(5/128). 3 - The distance that we found was double the amplitude, so we multiplied √(5/128) by (½). This is equal to √(5/512) inches.We converted this number to decimal form, making the amplitude is 0.0988 inches. To conclude, this number is the absolute value of the maximum displacement from a zero value during one period of an oscillation. Both this number (which could be considered the intensity or loudness of our wave) and the hertz (frequency) can affect how water behaves.

Bubble of water on a penny

Students determine how many drops of water can fit into a penny. Subtracting one drop from their total they then observe what happens when a soapy toothpick is touched to this bubble of water and the results create an interesting discussion of waters attraction to its self and how to change that attractive force

Spilling Water

There are small holes cut in the bottom of the bottle, so water flows out. But once the bottle is dropped, the bottle is falling from gravity the same way the water is. Since they are both falling the same way, the water is falling within the bottle, not out of it, and so the water doesn't spill out anymore. This is one way to simulate microgravity on Earth. When people go in the plane that dives down very fast, they feel like they are weightless because the plane is going downwards as fast as they would be falling and so compared to the plane, they (and any objects they brought with them) are floating not falling. When the water bottle hits the ground, it is going very fast and the reaction force is actually strong enough that the water splashes. Then, when the water bottle is just sitting on the ground, the water can flow out the holes again.

Scientist recreate the Big Bang in laboratory

Using four capacitors, two nodes, and 140V charge, the energy is released when the two nodes are connected by a metal bar.

Falling Dominoes

Newton's first law and the mechanical effect describe the dominoes' motion in this video. When the first domino was pushed by an external force, the domino's inertia caused the following to fall down. The motion of the domino falling was the mechanical energy. The faster the dominoes fell, the more energy they had. Either way, an external force caused the dominoes to move their inertia, resulting in the domino effect.

Conservation of Momentum

Hypothesis: The higher density ball when colliding with a lower density ball will knock the lower density ball back no matter the size. Goal of Experiment: This experiment was testing how collision is affected by the masses of the objects colliding at the same speed. This experiment also tests and confirms Newton’s Third Law of Motion: For every action, there is an equal and opposite reaction. Materials : Four Balls Were Used in This Video: Two basketballs of an equal mass of 600.29g One Volleyball with a mass of 274.19g One Shot Put with a mass of 4200g A ramp was placed on both sides of the track to launch the balls. The ramp was 7m tall, two people let the ball roll down the ramp at the same time, then observed the results. There were three trials conducted in this experiment: First trial: Two basketballs were rolled down the ramp colliding and knocking each other back an equal distance Second trial: The basketball from the previous trial and a volleyball were rolled down the ramp. The volleyball was knocked back farther than the basketball Third Trial: The same basketball was used once again and a shot put were rolled down the ramp. The basketball was knocked back significantly by the shot put. Conclusion: When objects collide the size of the object has little effect compared to the density (Mass) of the object.

Free fall

stated that the acceleration of a free-falling object (on earth) is 9.8 m/s/s. This value (known as the acceleration of gravity) is the same for all free-falling objects regardless of how long they have been falling, or whether they were initially dropped from rest or thrown up into the air.

Free falling object

The acceleration of a free-falling object (on earth) is 9.8 m/s/s. This value (known as the acceleration of gravity) is the same for all free-falling objects regardless of how long they have been falling, or whether they were initially dropped from rest or thrown up into the air.

Slinky drop

The top and the bottom of the slinky are accelerating towards the center of the mass of the slinky. While that's happening the center of the mass is accelerating downward.

How slow can you go?

My 3rd grade engineering group used the slow-mo setting on my ipad to determine which design made the marble drop one meter the slowest. The group that filled a tube with water and built a "water parachute" for the marble is the one to beat.

Bracelet Drop

As the bracelet drops there are two forces acting on it. When it hits the earth, the bracelet applies the same force but in opposite direction to the earth.