Physics (Part-III) (Railway)

• The acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass.

• A sound consists of a single frequency is called tone.

• When an object slides, sliding friction is involved, while rolling friction is involved when an object rolls over the surface of another object.

• As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.

• He was the first to propose that an atom comprises a small charged nucleus surrounded by empty space and are circled by tiny electrons which later, became known as the Rutherford model.

• He is credited with the discovery of protons and hypothesized the existence of the neutron.

• The percentage of moisture present in the atmosphere as compared to its full capacity at a given temperature is known as the relative humidity.

• Kinetic energy is a scalar quantity, and it is entirely described by magnitude alone.

• Kinetic Energy represent the

1/2  mv², where, m = mass,

v = velocity

• Since amplitude is basically a measure of distance, the SI unit is meter or 'm'.

• It detects ionizing radiation such as alpha particles, beta particles, and gamma rays using the lonization effect produced in a Geiger-Müller tube.