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Questions and Answers
What is the unit of mass?
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?
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What is the unit of average velocity?
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What is the unit of initial velocity?
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What is the unit of final velocity?
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What is the unit of acceleration?
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What is the unit of force?
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What is the unit of net force?
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What is the unit of distance?
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What is the unit of displacement?
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What is the unit of momentum?
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What is the unit of impulse?
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What is the unit of change in momentum?
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What is the unit of normal force?
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What is the unit of weight?
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What is the unit of force of gravity?
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What is the unit of force of friction?
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What is the unit of force of tension?
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What is the unit of drag force?
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What is the unit of lift force?
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What is the unit of applied force?
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What is the unit of traction force?
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What is the unit of spring force?
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What is the unit of electrostatic force?
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What is the unit of coefficient of kinetic friction?
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What is the unit of coefficient of static/kinetic friction?
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What is the unit of centripetal acceleration?
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What is the unit of centripetal force?
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What is the unit of work?
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What is the unit of power?
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What is the unit of gravitational potential energy?
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What is the unit of elastic potential energy?
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What is the unit of kinetic energy?
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What is the unit of internal energy?
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What is the unit of mechanical energy?
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What is the unit of electrical energy?
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What is the unit of energy of a photon?
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What is the unit of wave velocity/speed?
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What is the unit of wavelength?
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What is the unit of frequency?
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What is the unit of speed of light?
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What is the unit of spring constant?
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What is the unit of voltage?
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What is the unit of current?
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What is the unit of resistance?
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What is the unit of cross-sectional area of a wire?
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What is the unit of charge?
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What is the unit of index of refraction?
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What is the unit of resistivity?
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What is the unit of angle of incidence?
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What is the unit of angle of refraction?
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What is the unit of instantaneous velocity?
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What is the unit of average velocity?
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What is the unit of mean radius of Earth/Moon?
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What is the unit of Planck's constant?
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What is the unit of universal gravitational constant?
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What is the unit of electrostatic constant?
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What is the unit of elementary charge?
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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/sÂ²), 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/sÂ²), 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 (â„¦), indicating how strongly a material opposes current.
- The cross-sectional area of a wire is measured in square meters (mÂ²), 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 (â„¦m), indicating how strongly a material resists current flow.
Angles in Optics
- The angle of incidence and angle of refraction are both measured in degrees (Â°), 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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Test your knowledge of essential physics units with these flashcards. Each card presents a fundamental physics term alongside its standard unit of measurement. Perfect for students looking to reinforce their understanding of physics concepts!