2nd Cat Of Science (Sun And Earth) And (Forces- Push -pull)

Explanation
The sun is a natural source of light because it emits light and heat through a process called nuclear fusion. It produces its own light energy through the conversion of hydrogen into helium, releasing vast amounts of energy in the form of light and heat. Unlike lamps and torches, which require an external power source to produce light, the sun's light is generated naturally without the need for human intervention.

Explanation
Earth is classified as a planet because it is a celestial body that orbits around the Sun, it has sufficient mass to have a nearly round shape, and it has cleared its orbit of other debris. Unlike stars, Earth does not emit light through nuclear fusion. While it does have a molten core that produces heat, it is not a ball of fire like the Sun. Therefore, the correct answer is "A Planet."

Explanation
Earth takes approximately 24 hours to complete one round around its axis. This is known as a day. The rotation of Earth on its axis is what causes day and night. As Earth rotates, different parts of the planet are exposed to the Sun's light, creating the cycle of day and night. This 24-hour period is divided into 24 time zones, with each zone representing one hour of the day. Therefore, the correct answer is 24 hours.

Explanation
The question asks about the planet we live on. The correct answer is Earth, as it is the third planet from the Sun and is the only known planet to support life.

Explanation
The Moon takes approximately 27 days to complete one orbit around the Earth. This is known as the sidereal month, which is the time it takes for the Moon to return to the same position in the sky relative to the stars. This period is slightly longer than the lunar month, which is the time it takes for the Moon to complete its phases, due to the Earth's orbit around the Sun.

Explanation
The age of the Moon is estimated to be around 4.5 billion years old. This estimate is based on the age of the oldest rocks collected from the Moon's surface during various lunar missions. By analyzing the composition and radioactive decay of these rocks, scientists have been able to determine the approximate age of the Moon. This age is consistent with the age of the solar system and supports the theory that the Moon formed as a result of a giant impact between Earth and a Mars-sized body early in the history of the solar system.

Explanation
The moon does not produce its own light. It reflects the light of the sun, which is why we see it shining in the night sky. This phenomenon is similar to how a mirror reflects light.

Explanation
Stars can be seen in the sky at night because during this time, the sun has set and the sky is dark. When there is no sunlight to overpower their faint light, stars become visible. In contrast, during the day, the brightness of the sun makes it difficult to see the stars. Similarly, in the morning, the sun is rising and its light begins to illuminate the sky, making it harder to observe the stars. Therefore, the best time to see stars in the sky is at night.

Explanation
The moon gives us moonlight at night. Moonlight is the reflection of sunlight off the surface of the moon. Although the moon does not emit light of its own, its surface reflects the sunlight back to Earth, creating a soft, dim glow that illuminates the night sky. This phenomenon allows us to see and navigate in the darkness, and has inspired countless poems, songs, and stories throughout history.

Explanation
Yes, your shadow does move in the daytime. This is because the position of the sun changes throughout the day, causing the angle and direction of the sunlight to change. As a result, the position and length of your shadow will also change accordingly.

Explanation
Push is the correct answer because it is a name of force. Force is defined as a push or pull that can cause an object to accelerate, change its motion, or deform. In this case, push refers to applying force to move an object away from oneself or to exert pressure on it. The other options, nail cutter and rubber band, do not represent forces but rather objects or tools.

Explanation
To open a book, you have to apply a pulling force. This is because the pages of the book are held together by friction, and pulling on one side of the book helps to overcome this friction and separate the pages. Pushing or squeezing the book would not be effective in opening it as these forces would not be able to overcome the friction between the pages.

Explanation
Push is the correct answer because when you push something, you exert a force that moves it away from you. This is in contrast to pulling, where you exert a force to bring something closer to you. Floating is not a force, but rather a state in which an object remains on the surface of a liquid or gas without sinking.

Explanation
The given question is asking for a force that moves things towards you. Out of the options provided, "Pull" is the only force that fits this description. Pulling is the action of applying force to draw or drag something towards oneself, resulting in movement towards the person exerting the force. Therefore, the correct answer is "Pull".

Explanation
Rubber bands are known for their stretchability. Unlike tin and bottles, which are rigid and not flexible, rubber bands can be easily stretched and expanded. This is due to the material they are made of, which is typically a type of elastic polymer. When pulled, rubber bands can stretch to accommodate various sizes and shapes, making them useful for holding objects together or providing tension. Therefore, the correct answer is rubber band.

Explanation
The correct answer is Lemon squeezer because it is a simple machine. A lemon squeezer is a type of lever that helps to extract juice from a lemon by applying force on one end of the lever, which in turn exerts pressure on the lemon, squeezing out the juice. This lever mechanism makes it easier to squeeze the lemon and extract the juice, making it a simple machine.

Explanation
The force of water can be identified by observing the action of sinking. When an object sinks in water, it is being pushed downwards by the force of gravity, which is greater than the force exerted by the water pushing upwards. This force of water pushing upwards is what causes the object to sink.

Explanation
Blowing can be considered a force because it involves the application of pressure or a push to move air or other gases in a specific direction. When we blow, we exhale air forcefully, exerting a force on the air molecules. This force causes the air to move and creates a flow or a current. Therefore, blowing can be viewed as a forceful action that produces a directed movement of air or gas particles.

Explanation
When stapling papers together, a person typically uses a stapler to push the staple through the papers, securing them together. Therefore, the action of stapling can be associated with pushing.

Explanation
When typing on a computer keyboard, we typically press down on the keys to input characters or commands. This action of pressing down on the keys can be described as a pushing motion. Therefore, the correct answer is "Push".