Shane Chen - science

question 1

Geologic time shows Earth’s history from its formation to today. Scientists find the relative age of rocks using rules like the Law of Superposition (younger layers are on top of older ones) and cross-cutting relationships. To know the actual age, they use radiometric dating, which measures radioactive decay. These methods help build a timeline that shows when rocks formed and when life appeared or went extinct. Geologic time is divided into eons, eras, periods, and epochs, helping scientists understand how Earth and living things have changed through millions of years.

question 2

Adaptation and variations happen because of changes in DNA. When organisms reproduce small mutations or gene recombination create new traits. Some traits help plants or animal to survive better in the environment. Overtime, these useful traits become more through natural. and also food and environment will also make the plant or animal change

question 3

in the experiment i dint go that day but after i listen to my friend william abut the experiment i think the experiment is so fun. every sunflower seed seems same but after they mesure is it is totally different so i think its about the unit if im in the class that day i think i will be very participate and learn

question 4

GMOs are organisms that DNA was changed by scientist . scientist is genetic engineering to add or remove genes. this gives them new traits like pest resistance, faster growth, or better nutrition

question 5

animal or plant die after they been burried in the dirt for long time they will became fossil. over time the remain go through mineralization, where minerals replace the oringinal tissues and turm them in to rock. fossil cn also form as trace fossil, which shows evidence of an organism's activity such as footprint or burrows. pressure and time cause layers of sediment to harden in to rocks. prevering the fossil inside , later, erosion or digging can expose these fossil at the surface. and the scienctist can find it

question 6

in this unit i like the shap of the DNA and the traits. and also i think in this unit it tell me that how the earth looks like millions years ago it made me very impress the scientist. i want to learn more about how human change the DNA in to GMOs it make me really want do deeply learn it.This helps us understand both ancient life and modern science. Overall, this unit helped me connect biology, geology, and technology to better understand how life evolves.

question 7

(Net Force): The sum of all forces acting on an object, measured in Newtons (N).

(Mass): The magnitude of an object's inertia, measured in kilograms (kg).

(a) (Acceleration): The rate at which an object's velocity changes, measured in meters per second².(m/s)

question 8

Friction is a force that pushes against motion when two surfaces touch.

It can slow things down or stop them from moving.How strong the friction is depends on how rough the surfaces are and how hard they are pressed together.

question 9

In this experiment, we learned that when two different objects bump into each other, they will bounce off and fly away. If one of them then bumps into another object, that object will also fly away. This chain reaction helps us see how energy and motion can transfer from one object to another in the ping-pong ball experiment.

question 10

Potential energy is stored energy that is based on the position, height, and weight of the object. It is the total energy that can be unleashed once released. Kinetic energy is the energy that occurs when an object is in motion. For example, when you hold a ball in your hands up high, the higher the ball is, the more potential energy it has. When you drop the ball, you have kinetic energy. If the ball drops, the potential energy decreases as it transforms into kinetic energy, which increases.

question 11

One of the noncontact forces is gravitational force. Newton had a law of universal gravitation that says every object that exists on the universe pulls on every other object with a force that gets stronger when the objects have more mass or weaker when the objects get further apart. In simple terms, gravity is the invisible force that pulls all objects with mass towards the center of the Earth. When an apple falls from the tree, the force of gravity pulls the apple to the ground. Similarly, we also have mass so we do not float around on Earth.

question 12

I learned a lot of useful knowledge this unit, like potential energy, kinetic energy, and Newton's laws. I really enjoyed reading about Newton's laws because I had read about it when I was in elementary school. I am very proud of Newton because he was very clever and was able to figure out so much about physics in a time when science was not as advanced as it is today. He created a foundation of concepts that are still very relevant in the modern world. Some of the important concepts include the fact that speed is relative and that the more mass an object has, the more force you will need to push it. If you push on something, it will also push the same amount in the opposite direction. All of these ideas are very cool and I can apply them in daily life.

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