What are Newton’s laws of motion?
Newton’s laws of motion describe how objects move and why they move that way.
Page 2 to 12 Can You Recall : The first law says that an object will keep doing what it’s doing (either sitting still or moving in a certain direction) unless some force comes along and changes that. So, if you push a book across a table, it will keep sliding until something stops it.
The second law says that the more force you put on an object, the more it will accelerate (change its speed or direction). And, the harder it is to move something (the more mass it has), the more force you’ll need to use to make it move.
Newtons third law says that every action has an equal and opposite reaction. So, if you push on a wall, the wall is actually pushing back on you with the same amount of force.
What would happen if there were no gravity?
Gravity is the force that holds everything on Earth together, including people, buildings, and even the air around us. Every object with mass has gravity, which means that the larger an object is, the stronger its gravity.
If there were no gravity, objects would not be held together and they would move away from each other in a straight line. For example, if you threw a ball, it would just keep moving in a straight line instead of falling to the ground. Similarly, if you jumped, you would float up into the air and keep going until something stopped you.
Planets and stars would not remain in their orbits around the sun. Instead, they would fly off into space in a straight line. The same would happen to the moon, which would no longer be able to orbit around the Earth.
In addition, life on Earth would be impossible as we know it, as gravity plays a crucial role in many natural processes. For example, the water cycle relies on gravity to move water from the ground to the sky and back again. Plants also rely on gravity to grow and stay upright. Without gravity, these processes would not be possible, and life on Earth would not exist.
What would happen if the value of G was twice as large?
If the value of the gravitational constant G was twice as large as its current value, then the force of gravity between objects would be twice as strong. This means that objects that are attracted to each other, such as planets or stars, would experience a greater force of attraction. This would result in an increase in the gravitational pull between objects, which could have a number of potential effects. For example, the orbits of planets could change, and collisions between celestial bodies could be more likely. Additionally, the structure and behavior of stars could be affected, potentially leading to changes in their lifecycles and evolution. However, it is important to note that the gravitational constant is a fundamental physical constant, and any changes to its value would have far-reaching and complex consequences throughout the universe.
What would be the value of g on the surface of the earth if its mass was twice as large and its radius half of what it is now?
The value of g on the surface of the earth would be the same in both scenarios. This is because the acceleration due to gravity only depends on the mass and radius of the planet, and not on any other factors. Therefore, even if the mass was twice as large and the radius was half of what it is now, the value of g would be approximately 9.81 m/s^2 on the surface of the earth.
Will the direction of the gravitational force change as we go inside the earth?
Yes, the direction of the gravitational force does change as we go inside the Earth. As we move towards the center of the Earth, the gravitational force decreases because the mass of the Earth above us is getting smaller. However, at the center of the Earth, the gravitational force is zero because the mass of the Earth is all around us and cancels out the force. As we move further down towards the other side of the Earth, the gravitational force begins to increase again but in the opposite direction.
What will be the value of g at the centre of the earth?
The value of g at the center of the earth is theoretically zero, because there would be equal gravitational forces pulling in all directions. However, since the earth is not a perfect sphere and has non-uniform density, the actual value of g at the center of the earth is estimated to be around 0. However, this is just a theoretical estimation and it is impossible to measure the actual value of g at the center of the earth.
Will your weight remain constant as you go above the surface of the earth?
the weight of an object will change as it moves further away from the surface of the Earth. This is because the force of gravity decreases as the distance between two objects increases. So, technically, an object’s weight would decrease slightly as it goes further away from the Earth’s surface.
Suppose you are standing on a tall ladder. If your distance from the centre of the earth is 2R, what will be your weight?
Assuming R is the radius of the Earth, your weight on a tall ladder at a distance of 2R from the center of the Earth will be one-fourth of your weight on the Earth’s surface. This is because weight is directly proportional to the distance from the center of the Earth and inversely proportional to the square of the distance. Therefore, your weight on the ladder will be equal to your weight on Earth divided by 4.
According to Newton’s law of gravitation, earth’s gravitational force is higher on an object of larger mass. Why doesn’t that object fall down with higher velocity as compared to an object with lower mass?
Actually, the reason that objects of different masses fall at the same rate is due to another one of Newton’s laws, the law of inertia. This law states that an object at rest will remain at rest and an object in motion will remain in motion at a constant velocity, unless acted upon by an external force. So, when an object is dropped, the force of gravity acts on it equally regardless of its mass. However, the object with a larger mass also has a greater inertia, so it’s harder to get it moving in the first place, but once it does start moving, it falls at the same rate as a lighter object.