Terms in Physics with definitions you should know.

Here are some main terms used in secondary-level physics and their definitions:

1. Physics: Physics is the scientific study of the fundamental principles that govern the behavior of the physical universe, including matter, energy, and their interactions.
2. Force: Force is a push or pull that can change the motion or shape of an object. It is typically measured in newtons (N).
3. Motion: Motion refers to the change in an object’s position over time. It involves concepts like distance, displacement, speed, and velocity.
4. Velocity: Velocity is a vector quantity that describes both the speed and direction of an object’s motion.
5. Acceleration: Acceleration is the rate of change of velocity with respect to time. It is measured in meters per second squared (m/s²).
6. Gravity: Gravity is the force of attraction that pulls objects with mass toward each other. It gives weight to physical objects and is responsible for phenomena like falling and orbits.
7. Mass: Mass is a measure of the amount of matter in an object and is typically measured in kilograms (kg).
8. Weight: Weight is the force exerted on an object due to gravity. It is the product of an object’s mass and the acceleration due to gravity (9.8 m/s² on Earth).
9. Energy: Energy is the capacity to do work or cause a change in an object’s state. It exists in various forms, including kinetic, potential, thermal, and electrical energy.
10. Work: In physics, work is done when a force is applied to an object, causing it to move over a distance in the direction of the force. Work is measured in joules (J).
11. Power: Power is the rate at which work is done or the rate at which energy is transferred or converted. It is measured in watts (W).
12. Momentum: Momentum is the product of an object’s mass and its velocity. It is a vector quantity and is conserved in a closed system.
13. Friction: Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact.
14. Newton’s Laws of Motion:
    • First Law: An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
    • Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).
    • Third Law: For every action, there is an equal and opposite reaction.
15. Electromagnetism: Electromagnetism is a branch of physics that studies the relationship between electric and magnetic fields and how they interact.
16. Electric Current: Electric current is the flow of electric charge through a conductor and is measured in amperes (A).
17. Voltage (Electric Potential Difference): Voltage is the electric potential difference between two points and is measured in volts (V). It represents the energy per unit charge.
18. Circuit: A circuit is a closed path or loop through which electric current can flow. It typically consists of components like resistors, capacitors, and batteries.
19. Ohm’s Law: Ohm’s Law states that the current (I) in a circuit is directly proportional to the voltage (V) and inversely proportional to the resistance (R) (V = IR).
20. Wave: A wave is a disturbance that travels through space, transferring energy without the transfer of matter. Examples include light waves and sound waves.

These are some fundamental terms in secondary-level physics. Understanding these concepts is essential for gaining a solid foundation in physics, and they serve as the building blocks for more advanced topics in the field.