Q1: What is the difference between weight and mass?

Weight and mass are two terms that are often used interchangeably, but they actually have different meanings in physics.

Mass is a measure of the amount of matter in an object. It is a scalar quantity and is usually measured in kilograms (kg) or grams (g). Mass is an intrinsic property of an object, which means it does not change with location or the gravitational field.

Weight, on the other hand, is the force exerted on an object due to gravity. It is a vector quantity and is usually measured in newtons (N) or pounds (lb). Weight is directly proportional to mass and the acceleration due to gravity. Hence, weight can vary depending on the location and the gravitational field where the object is located.

For example, if you were to weigh a 1 kg object on the surface of the Earth, it would have a weight of approximately 9.81 N (due to the acceleration due to gravity on Earth being approximately 9.81 m/s²). However, if you were to weigh the same object on the surface of the moon, where the gravitational acceleration is only about 1.62 m/s², its weight would be much less, around 1.62 N. However, the object’s mass would still remain the same, at 1 kg, regardless of its location.

Q2: Is there any relation between mass and weight in the form of equation?

Answer: Yes, there is a relationship between mass and weight in the form of an equation. The weight of an object can be calculated using the following equation:

Weight (W) = mass (m) x acceleration due to gravity (g)

where:

• Weight (W) is measured in newtons (N)
• Mass (m) is measured in kilograms (kg)
• Acceleration due to gravity (g) is measured in meters per second squared (m/s²)

On the surface of the Earth, the acceleration due to gravity is approximately 9.81 m/s². Therefore, if an object has a mass of 1 kg, its weight on the surface of the Earth would be:

W = m x g

W = 1 kg x 9.81 m/s²

W = 9.81 N

Q3: Does milk also contain an atom? Explain.

Answer: Yes, milk is made up of atoms, just like all other matter. Milk is a complex mixture of various substances, including water, proteins, fats, carbohydrates, vitamins, and minerals. All of these substances are made up of different combinations of atoms, such as carbon, hydrogen, oxygen, nitrogen, calcium, and potassium, to name a few.

For example, milk contains molecules of the protein casein, which is composed of amino acids that contain carbon, hydrogen, oxygen, and nitrogen atoms. Milk also contains lactose, a sugar that is composed of glucose and galactose molecules, which are made up of carbon, hydrogen, and oxygen atoms.

So, in short, milk, like all other substances, is made up of atoms, which are the building blocks of matter.

Q4: Does milk contain one type of atom?

Answer: No, milk, like all other matter, is made up of many different types of atoms. Milk is a complex mixture of various substances, including water, proteins, fats, carbohydrates, vitamins, and minerals, and each of these substances is composed of different types of atoms.

For example, water, which makes up the majority of milk, is composed of hydrogen and oxygen atoms. Milk proteins, such as casein and whey, are composed of amino acids that contain carbon, hydrogen, oxygen, and nitrogen atoms. Milk carbohydrates, such as lactose, contain carbon, hydrogen, and oxygen atoms. Milk also contains various minerals, such as calcium, phosphorus, and potassium, which are composed of different types of atoms.

Therefore, milk, like all other matter, is composed of many different types of atoms, which combine to form the various molecules and substances that make up milk.

Q5: Does alloy also has atoms? Give example.

Yes, alloys are also made up of atoms. An alloy is a mixture of two or more metals or a metal and a non-metal, where the atoms of the different elements are combined in a way that produces a new material with different properties than the individual elements.

For example, brass is an alloy that is made up of copper and zinc. The atoms of copper and zinc are combined in a specific ratio to produce a new material that has different properties than either copper or zinc alone. Brass is a harder and more durable material than copper, making it useful for a variety of applications, such as in musical instruments, plumbing fixtures, and decorative objects.

Another example of an alloy is steel, which is made up of iron and carbon. The atoms of iron and carbon are combined in a specific ratio to produce a material that is stronger and more durable than pure iron. Steel is used in many applications, including construction, machinery, and transportation.

So, in short, alloys are made up of atoms, just like all other materials, and the properties of an alloy are determined by the types and ratios of atoms that are combined to form it.