Physics Units Flashcards
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Questions and Answers

What is the unit of mass?

  • Joules (J)
  • kilogram (kg) (correct)
  • Newtons (N)
  • meters per second (m/s)

    • What is the unit of time?

    seconds (s)

    What is the unit of speed?

    meters per second (m/s)

    What is the unit of velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of average velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of initial velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of final velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of acceleration?

    <p>meters per second squared (m/s^2)</p> Signup and view all the answers

    What is the unit of force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of net force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of distance?

    <p>meters (m)</p> Signup and view all the answers

    What is the unit of displacement?

    <p>meters (m)</p> Signup and view all the answers

    What is the unit of momentum?

    <p>kilogram meters per second (kgm/s)</p> Signup and view all the answers

    What is the unit of impulse?

    <p>Newton seconds (Ns)</p> Signup and view all the answers

    What is the unit of change in momentum?

    <p>Newton seconds (Ns)</p> Signup and view all the answers

    What is the unit of normal force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of weight?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of force of gravity?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of force of friction?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of force of tension?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of drag force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of lift force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of applied force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of traction force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of spring force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of electrostatic force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of coefficient of kinetic friction?

    <p>unitless</p> Signup and view all the answers

    What is the unit of coefficient of static/kinetic friction?

    <p>unitless</p> Signup and view all the answers

    What is the unit of centripetal acceleration?

    <p>meters per second squared (m/s^2)</p> Signup and view all the answers

    What is the unit of centripetal force?

    <p>Newtons (N)</p> Signup and view all the answers

    What is the unit of work?

    <p>Newton-meters (Nm), Joules (J)</p> Signup and view all the answers

    What is the unit of power?

    <p>Watts (W), Newton meters per second (Nm/s), Joules per second (J/s)</p> Signup and view all the answers

    What is the unit of gravitational potential energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of elastic potential energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of kinetic energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of internal energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of mechanical energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of electrical energy?

    <p>Joules (J)</p> Signup and view all the answers

    What is the unit of energy of a photon?

    <p>electronvolt (eV), Joules (J)</p> Signup and view all the answers

    What is the unit of wave velocity/speed?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of wavelength?

    <p>meters (m)</p> Signup and view all the answers

    What is the unit of frequency?

    <p>Hertz (Hz)</p> Signup and view all the answers

    What is the unit of speed of light?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of spring constant?

    <p>Newtons per meter (N/m)</p> Signup and view all the answers

    What is the unit of voltage?

    <p>Volts (V)</p> Signup and view all the answers

    What is the unit of current?

    <p>Amperes, Amps (A)</p> Signup and view all the answers

    What is the unit of resistance?

    <p>Ohms (Ω)</p> Signup and view all the answers

    What is the unit of cross-sectional area of a wire?

    <p>square meters (m^2)</p> Signup and view all the answers

    What is the unit of charge?

    <p>Coulomb (C)</p> Signup and view all the answers

    What is the unit of index of refraction?

    <p>unitless</p> Signup and view all the answers

    What is the unit of resistivity?

    <p>Ohm meters (Ωm)</p> Signup and view all the answers

    What is the unit of angle of incidence?

    <p>degrees (^o)</p> Signup and view all the answers

    What is the unit of angle of refraction?

    <p>degrees (^o)</p> Signup and view all the answers

    What is the unit of instantaneous velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of average velocity?

    <p>meters per second (m/s)</p> Signup and view all the answers

    What is the unit of mean radius of Earth/Moon?

    <p>meters</p> Signup and view all the answers

    What is the unit of Planck's constant?

    <p>Joule-second</p> Signup and view all the answers

    What is the unit of universal gravitational constant?

    <p>Newton meters squared per kilograms squared</p> Signup and view all the answers

    What is the unit of electrostatic constant?

    <p>Newton meters squared per Coulombs squared</p> Signup and view all the answers

    What is the unit of elementary charge?

    <p>Coulombs</p> Signup and view all the answers

    Study Notes

    Physics Units Overview

    • Mass is measured in kilograms (kg), a fundamental property of matter.
    • Time is quantified in seconds (s), the basic unit for measuring duration.
    • Speed is expressed in meters per second (m/s), representing distance traveled per unit of time.
    • Velocity, like speed, is also in meters per second (m/s) but includes direction.
    • Average velocity is consistent with meters per second (m/s), calculated over a time interval.
    • Initial velocity and final velocity, both in meters per second (m/s), indicate speeds at distinct moments.

    Motion and Forces

    • Acceleration is measured in meters per second squared (m/s²), indicating the rate of change of velocity.
    • Force is quantified in Newtons (N), a vector that results from mass and acceleration (F=ma).
    • Net force (also in Newtons (N)) is the vector sum of all forces acting on an object.
    • Distance and displacement are both measured in meters (m), with displacement accounting for direction.
    • Momentum is defined as kilogram meters per second (kgm/s), representing the product of mass and velocity.
    • Impulse can be expressed in Newton seconds (Ns) or kilogram meters per second (kgm/s), correlating to changes in momentum.

    Types of Forces

    • Various forces such as normal force, weight, gravity, friction, and tension are all measured in Newtons (N).
    • Drag force and lift force are also quantified in Newtons (N), related to fluid dynamics.
    • Applied force and traction force influence motion and are measured in Newtons (N).
    • Spring force follows Hooke's law and is measured in Newtons (N).
    • Electrostatic force is equally measured in Newtons (N), governing interactions between charged particles.

    Friction and Motion

    • The coefficient of kinetic friction is a unitless value representing the friction's effectiveness when an object is sliding.
    • The coefficient of static/kinetic friction is also unitless, indicating the ratio of frictional force to normal force at rest or in motion.
    • Centripetal acceleration is described in meters per second squared (m/s²), essential for objects in circular motion.
    • Centripetal force keeps objects moving in a circle and is measured in Newtons (N).

    Energy and Work

    • Work is measured in Newton-meters (Nm) or Joules (J), essential in energy transfer calculations.
    • Power is expressed in Watts (W), Newton meters per second (Nm/s), or Joules per second (J/s), indicating energy transfer rate.
    • Various forms of energy such as gravitational potential energy, elastic potential energy, kinetic energy, internal energy, mechanical energy, and electrical energy are all measured in Joules (J).
    • Energy of a photon can be expressed as electronvolt (eV) or Joules (J), significant in quantum physics.

    Waves and Electrical Concepts

    • Wave velocity/speed is quantified in meters per second (m/s), related to frequency and wavelength.
    • Wavelength is measured in meters (m), representing the distance between successive peaks in a wave.
    • Frequency is expressed in Hertz (Hz), indicating the number of cycles per second.
    • The speed of light is a fundamental constant measured in meters per second (m/s).
    • Spring constant is measured in Newtons per meter (N/m), indicating the stiffness of a spring.
    • Voltage is quantified in Volts (V), representing electric potential difference.

    Electric Characteristics

    • Current is measured in Amperes (A), representing the flow rate of electric charge.
    • Resistance is expressed in Ohms (Ω), indicating how strongly a material opposes current.
    • The cross-sectional area of a wire is measured in square meters (m²), affecting resistance and current flow.
    • Charge is quantified in Coulombs (C), a fundamental property of electrons and protons.
    • Index of refraction is a unitless number representing how light propagates through different mediums.
    • Resistivity is expressed in Ohm meters (Ωm), indicating how strongly a material resists current flow.

    Angles in Optics

    • The angle of incidence and angle of refraction are both measured in degrees (°), crucial in determining how light interacts with surfaces.

    Special Constants

    • Planck's constant is expressed as Joule-second, fundamental in quantum mechanics.
    • The universal gravitational constant is measured in Newton meters squared per kilograms squared, essential for gravitational calculations.
    • The electrostatic constant is expressed in Newton meters squared per Coulombs squared, governing electric force interactions.
    • Elementary charge is defined in Coulombs (C), representing the basic unit of electric charge.

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