Physical Quantities and SI Units Quiz
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Questions and Answers

What is the SI unit for mass?

  • Ampere
  • Kilogram (correct)
  • Kelvin
  • Metre

The base unit for temperature in the SI system is Fahrenheit.

False (B)

What is the symbol for the unit of electric current?

A

The ______ is the derived unit for force.

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

Match the following prefixes with their multiplying factors:

<p>Tera = 10^12 Giga = 10^9 Mega = 10^6 Kilo = 10^3</p> Signup and view all the answers

Which of the following is a derived unit?

<p>Pressure (A)</p> Signup and view all the answers

1 meter is equivalent to 1000 millimeters.

<p>True (A)</p> Signup and view all the answers

What physical quantity is defined as mass multiplied by velocity?

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

Which of the following correctly describes a vector?

<p>A physical quantity with both magnitude and direction (C)</p> Signup and view all the answers

A scalar quantity must include both direction and magnitude.

<p>False (B)</p> Signup and view all the answers

What is the term used to describe the combination of vectors?

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

Displacement is to vector as ______ is to scalar.

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

Match the following pairs of quantities:

<p>Velocity = Speed ElectricCurrent = ElectricCharge Force = Time Acceleration = Rate of change of speed</p> Signup and view all the answers

Which equation represents a homogeneous equation?

<p>$5m = 5m$ (D)</p> Signup and view all the answers

The accurate nature of an answer depends solely on the final calculation.

<p>False (B)</p> Signup and view all the answers

What is the importance of significant figures in reporting results?

<p>To reflect the precision of measurements</p> Signup and view all the answers

What is the definition of 1 Volt?

<p>The energy transferred when 1 Coulomb passes between 2 points and transfers 1 Joule (A)</p> Signup and view all the answers

Conventional current refers to the flow of electrons from the positive terminal to the negative terminal.

<p>False (B)</p> Signup and view all the answers

What is the formula for electrical power in a circuit?

<p>P = VI</p> Signup and view all the answers

Electrical resistance is the opposition to the flow of __________.

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

Match the following terms with their definitions:

<p>Voltage = Energy per unit charge Current = Flow of electric charge Power = Rate of energy conversion Resistance = Opposition to current flow</p> Signup and view all the answers

What is the primary function of a voltmeter?

<p>To measure energy change (B)</p> Signup and view all the answers

The electrical energy transferred to other forms when a unit charge passes is called potential difference.

<p>True (A)</p> Signup and view all the answers

When current passes through a resistor, some energy is _____ due to internal resistance.

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

What is the state of an object when it is in translational equilibrium?

<p>The forces acting up equal the forces acting down. (A)</p> Signup and view all the answers

A current of 1 ampere means 1 coulomb of charge flows past a point in 1 second.

<p>True (A)</p> Signup and view all the answers

What is the charge of one electron?

<p>1.6 x 10^-19 C</p> Signup and view all the answers

The amount of charge that passes a point when a current of 1 ampere flows for 1 second is called 1 _____ .

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

Which of the following best describes the principle of moments?

<p>It states that when an object is in equilibrium, the clockwise moments equal the counterclockwise moments. (B)</p> Signup and view all the answers

A charge carrier can be an electron.

<p>True (A)</p> Signup and view all the answers

In translational equilibrium, what must the forces acting to the left equal?

<p>the forces acting to the right</p> Signup and view all the answers

Flashcards

SI Base Units

Seven fundamental units in the International System of Units (SI) from which all other units are derived.

Kilogram

SI base unit of mass.

Meter

SI base unit of length.

Second

SI base unit of time.

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Derived Units

Units formed from combinations of base units.

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Velocity (unit)

Meter per second (m/s).

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Density (unit)

Kilogram per cubic meter (kg/m³).

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Prefixes (example)

Used to modify SI base units by factors of 10 (e.g., kilo- means 1000 times).

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Homogenous Equation

A valid equation where both sides have the same units and dimensions.

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Scalar

A physical quantity that only requires magnitude (size) and a unit.

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Significant Figures

The number of digits in a measurement that are considered reliable.

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Displacement

A vector quantity representing the change in position.

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Distance

A scalar quantity representing the total length of a path.

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Combining Vectors

Process of adding or subtracting vectors using methods like the parallelogram or triangle rule.

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Conventional Current

The direction of positive charge flow in an electric circuit.

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Electric Potential Difference (Voltage)

The electrical energy per unit charge transferred between two points in a circuit.

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1 Volt

When one coulomb of charge moves between two points transferring one joule of energy.

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Electrical Power

The rate at which electrical energy is transformed into other forms of energy in a circuit.

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Electrical Resistance

The opposition that a material or component offers to the flow of current.

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Ohm's Law equation

Voltage = Current x Resistance

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Electron Flow

Electrons flow from the negative terminal of a battery to the positive terminal.

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Voltmeter

A device used to measure electric potential difference (voltage) across a component.

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Translational Equilibrium

An object is in translational equilibrium when the upward forces equal the downward forces, and the forces to the left equal forces to the right.

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Force Equilibrium

A state where the net force acting on an object is zero, resulting in no acceleration.

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Electric Current

The rate of charge flow at a point.

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Coulomb

Unit of electric charge; 1 coulomb is the amount of charge passing a point when a 1-ampere current flows for 1 second.

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Charge Carrier

Particles that carry electric charge, such as electrons.

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Equilibrium

A state of balance where the net forces acting on an object are zero.

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Resolving Forces

Breaking down a force into components acting in perpendicular directions.

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Magnitude of force

The strength of a force, measured in Newtons (N).

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Study Notes

Physical Quantities and SI Units

  • Physical quantities include speed, mass, length, and temperature.
  • The SI system uses base units from which all other units are derived.
  • Base units to know: kilogram (kg), second (s), metre (m), ampere (A), kelvin (K), candela (cd), and mole (mol).

Derived Units

  • Derived units are all other physical quantities except base units.
  • Examples include velocity (m/s), density (kg/m³), momentum (kg m/s), force (kg m/s²), pressure (kg/m·s²), work/energy (kg m²/s²), power (kg m²/s³), electric charge (A·s), potential difference (kg m²/(A·s³)), and resistance (kg m²/(A²·s³)).

Scalars and Vectors

  • Scalars have only magnitude (e.g., distance, speed, time, mass).
  • Vectors have magnitude and direction (e.g., displacement, velocity, acceleration, force).

Combining Vectors

  • Vectors can be combined using the "nose-to-tail" method or trigonometry.
  • The resultant vector represents the combined effect of multiple vectors.
  • The resultant vector represents the vector sum of the vectors.

Equilibrium of Forces

  • An object is in translational equilibrium when the forces acting upward equal the forces acting downward, and the forces acting toward the left equal the forces acting toward the right.

Principle of Moments

  • This chapter discusses the balance of forces on objects.

Electric Current

  • Electric current is the rate of flow of charge at a point.
  • Coulomb is the unit of charge, equivalent to the current of 1 ampere flowing for 1 second.
  • The charge of one electron is 1.6 x 10⁻¹⁹ C.
  • Conventional current is the charge per unit time transported in a certain direction.

Potential Difference

  • Potential difference refers to the electrical energy transfer between two points.
  • A Volt is the amount of energy transferred when 1 Coulomb of charge passes between two points.

Electrical Power

  • Power is the rate at which electrical energy is converted to other forms.
  • The formula for electrical power is P = IV. It relates to the current and potential difference.

Resistance and Resistivity

  • Resistance opposes current flow in a circuit.
  • Resistivity is the resistance of a 1-meter length of material with a 1m² cross-sectional area.
  • Resistors in series have a total resistance equal to the sum of individual resistances (Rtotal = R1 + R2 + R3).
  • Resistors in parallel have a total resistance calculated with the formula 1/Rtotal = 1/R1 + 1/R2 + 1/R3.

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Description

Test your understanding of physical quantities, SI units, and the distinction between scalars and vectors. This quiz will cover base and derived units, as well as methods for combining vectors. Challenge yourself with questions on measurements that form the foundation of physics.

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