Mechanics
Mechanics
- The branch of physics: Mechanics is an area of physics that deals with the motion of objects, the forces that act on them, and their resulting motion.
- Types of mechanics: Mechanics can be divided into two main branches, classical mechanics and quantum mechanics.
- Motion and its parameters: Motion is a change in position of an object with respect to time. Motion is typically described in terms of displacement, velocity, acceleration, time, and speed.
- Scalar and vector quantities: Mechanics uses both scalar and vector quantities. Scalars have magnitude only, whereas vectors have both magnitude and direction.
- Newton's laws of motion: There are three fundamental laws of motion, according to Sir Isaac Newton: First law (law of inertia), the second law (force equals mass times acceleration), and the third law (action and reaction).
- Work, energy, and power: Work is the force times the distance an object moves. Energy is the capacity for doing work, and there are various forms of energy such as kinetic, potential, thermal energy and more. Power is work done or energy transferred in a given amount of time.
- Conservation Laws: The conservation law in physics refers to the principle that certain properties such as energy, momentum, and electric charge, among others, remain constant.
- Momentum and impulse: Momentum is a vector quantity, defined as the product of an object's mass and its velocity. Impulse is the change in momentum of an object when a force is applied.
- Frames of reference: A frame of reference in physics can be thought of as the background or space within which to analyse movement and other changes. It can be stationary or moving with constant velocity, or non-inertial (accelerating).
- Gravitational forces: All objects with mass attract each other through a force known as gravity. The gravitational force between two objects depends on their mass and the distance between them.
- Simple harmonic motion: It is a type of oscillatory motion where the restoring force is directly proportional to the displacement. It is characterized by its amplitude, frequency, period, and phase.
- Elasticity and Hooke’s Law: Hooke's law is a principle of physics that states that the force F needed to extend or compress a spring by some distance X is proportional to that distance. It's famously known as F=-kX where k is known as spring constant.
Remember, to fully understand these concepts, you must not only memorise these points, but also practice problem-solving and applying these principles in different scenarios.