Physics Lecture Notes on Units, Measurement, Motion, Waves and Thermodynamics

These flashcards cover key principles and concepts from various topics in physics, including units and measurement, motion, waves, thermodynamics and more.

What are fundamental quantities in the SI system?

Fundamental quantities are independent physical quantities that cannot be expressed in terms of other quantities, such as length, mass, and time.

What is the SI unit of force?

The SI unit of force is the Newton (N), which is equivalent to kg m/s².

What defines the International System of Units (SI)?

The SI system is an internationally accepted system of measurement that includes a complete set of both base and derived units for scientific and commercial use.

How is significant figures defined?

Significant figures are the digits in a measurement that are reliable plus the first uncertain digit.

What is the relationship between average velocity and instantaneous velocity?

As the time interval approaches zero, average velocity becomes equal to instantaneous velocity.

What is the formula for the period of a simple pendulum?

The period T of a simple pendulum is given by the formula T = 2π√(L/g), where L is the length of the pendulum and g is the acceleration due to gravity.

What is the difference between transverse and longitudinal waves?

In transverse waves, oscillations occur perpendicular to the direction of wave propagation, while in longitudinal waves, oscillations occur parallel to the direction of wave propagation.

What is Bernoulli's principle?

Bernoulli's principle states that in a streamline flow, the sum of the pressure energy, kinetic energy per unit volume, and potential energy per unit volume is constant.

What defines kinetic energy in simple harmonic motion?

The kinetic energy (K) in simple harmonic motion is given by K = 1/2 m v², where m is mass and v is velocity.

How does the frequency of a simple pendulum change with length?

The frequency increases as the length of the string shortens; specifically, frequency is inversely related to the square root of the length.

What is the concept of escape velocity?

Escape velocity is the minimum speed required for an object to break free from the gravitational pull of a celestial body.

What does the term 'work' refer to in physics?

Work is defined as the force applied to an object times the displacement in the direction of the force, expressed as W = F · d.

What is Newton's first law of motion?

A body at rest remains at rest, and a body in motion continues in uniform motion unless acted upon by an external force.

What characterizes an elastic collision?

In an elastic collision, both momentum and kinetic energy are conserved.

What is the difference between a scalar and a vector quantity?

A scalar quantity has only magnitude, while a vector quantity has both magnitude and direction.

What is the unit of pressure measured in pascals (Pa)?

Pressure is defined as force per unit area, expressed as P = F/A, with 1 Pa = 1 N/m².

What does the term 'capillarity' describe?

Capillarity refers to the ability of a liquid to flow in narrow spaces without the assistance of external forces, impacted by surface tension.

What is the role of thermal conductivity in materials?

Thermal conductivity is the ability of a material to conduct heat, measured in units of W/(m·K).

What determines the speed of sound in a medium?

The speed of sound is determined by the medium's density and elasticity; it travels faster in solids than in liquids and gases.