Physics

Definition

Physics is the branch of science that studies matter, energy, and the fundamental forces of nature. It examines how these elements interact through space and time.

5 Must Know Facts For Your Next Test

1. Physics employs precise units and measurements to describe physical quantities such as length, mass, and time.
2. The International System of Units (SI) is the standard system for measurement in physics.
3. Fundamental quantities in physics include length (meter), mass (kilogram), time (second), electric current (ampere), temperature (kelvin), amount of substance (mole), and luminous intensity (candela).
4. Dimensional analysis is a technique used to check the consistency of equations by comparing dimensions on both sides.
5. The scope of physics spans from subatomic particles to vast astronomical phenomena, covering multiple scales of measurement.

Review Questions

• What are the seven fundamental quantities in the International System of Units?
• How does dimensional analysis help verify the correctness of physical equations?
• Why is it important to use standard units like SI in physics?

Related terms

International System of Units (SI): A standardized system for measuring physical quantities, including units like meters for length and kilograms for mass.

Dimensional Analysis: A method used to verify the consistency of equations by ensuring that all terms have the same dimensional units.

Fundamental Forces: The basic interactions that govern how particles and objects behave: gravitational, electromagnetic, strong nuclear, and weak nuclear forces.