1) What are the main apparatuses used in the experiment?
Weight box, beam balance, forceps and balance of different masses.
2) What is mass?
The mass of a body is the quantity of matter contained in it.
3) What is weight?
The weight of a body is the force by which the Earth pulls the body towards its centre.
4) What is the simplest method for measuring the mass of a body?
The simplest method for measuring the mass of a body is by using a common balance.
5) Why are plates made of agate?
Agate helps to reduce friction.
6) What is the SI unit of mass?
The SI unit of mass is the kilogram (kg).
7) What is the SI unit of weight?
The newton (N) is the SI unit of weight.
8) What are the main differences between mass and weight?
Weight is a vector quantity, while mass is a scalar quantity. Mass is constant in most cases, while weight varies depending on the gravitational force under it.
9) Is it advisable to weigh a hot object?
No, because the object may lose or gain matter in the process. So, this might change the mass distribution inside the object.
10) What is meant by relative density?
The ratio of the density of a body to the water density at 4°C is known as relative density.
11) How do you measure weight?
Weight is calculated using a spring balance.
12) What is the standard unit used for calculating the mass of an atom or subatomic particle?
Atomic mass unit is the standard unit used for calculating the mass of an atom or subatomic particle.
13) What is meant by the density of an object?
Density is the ratio of mass to the volume of an object.
14) What is the value of the density of water at 4° C?
At 4° C, the density of water is 998.97 kg/m3.
15) Why do we generally close the shutter of the balance while weighing?
While weighing, we generally close the shutter of the balance to avoid air current.
16) What is meant by the sensitivity of the balance?
The sensitivity of the balance is the mass needed to change the resting point by 1 division.
17) Explain the phenomena in which both gravitational mass and inertial mass take part.
In the simple harmonic motion of the pendulum bob, both gravitational and inertial masses play their part.
18) What is the working principle of a spring balance?
Hooke’s law is the theoretical foundation of the spring balance. It works on the principle that when an object is suspended from an upright spring, the object generates an extension in the spring’s length, proportional to its weight.
19) What is meant by true balance?
True balance is a balance that possesses pans of equal weight and equal lengths.
20) What is the astronomical unit of mass?
The astronomical unit of mass is solar mass.
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