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Questions and Answers
What is the SI unit for mass?
What is the SI unit for mass?
The base unit for temperature in the SI system is Fahrenheit.
The base unit for temperature in the SI system is Fahrenheit.
False
What is the symbol for the unit of electric current?
What is the symbol for the unit of electric current?
A
The ______ is the derived unit for force.
The ______ is the derived unit for force.
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Match the following prefixes with their multiplying factors:
Match the following prefixes with their multiplying factors:
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Which of the following is a derived unit?
Which of the following is a derived unit?
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1 meter is equivalent to 1000 millimeters.
1 meter is equivalent to 1000 millimeters.
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What physical quantity is defined as mass multiplied by velocity?
What physical quantity is defined as mass multiplied by velocity?
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Which of the following correctly describes a vector?
Which of the following correctly describes a vector?
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A scalar quantity must include both direction and magnitude.
A scalar quantity must include both direction and magnitude.
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What is the term used to describe the combination of vectors?
What is the term used to describe the combination of vectors?
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Displacement is to vector as ______ is to scalar.
Displacement is to vector as ______ is to scalar.
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Match the following pairs of quantities:
Match the following pairs of quantities:
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Which equation represents a homogeneous equation?
Which equation represents a homogeneous equation?
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The accurate nature of an answer depends solely on the final calculation.
The accurate nature of an answer depends solely on the final calculation.
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What is the importance of significant figures in reporting results?
What is the importance of significant figures in reporting results?
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What is the definition of 1 Volt?
What is the definition of 1 Volt?
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Conventional current refers to the flow of electrons from the positive terminal to the negative terminal.
Conventional current refers to the flow of electrons from the positive terminal to the negative terminal.
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What is the formula for electrical power in a circuit?
What is the formula for electrical power in a circuit?
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Electrical resistance is the opposition to the flow of __________.
Electrical resistance is the opposition to the flow of __________.
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Match the following terms with their definitions:
Match the following terms with their definitions:
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What is the primary function of a voltmeter?
What is the primary function of a voltmeter?
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The electrical energy transferred to other forms when a unit charge passes is called potential difference.
The electrical energy transferred to other forms when a unit charge passes is called potential difference.
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When current passes through a resistor, some energy is _____ due to internal resistance.
When current passes through a resistor, some energy is _____ due to internal resistance.
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What is the state of an object when it is in translational equilibrium?
What is the state of an object when it is in translational equilibrium?
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A current of 1 ampere means 1 coulomb of charge flows past a point in 1 second.
A current of 1 ampere means 1 coulomb of charge flows past a point in 1 second.
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What is the charge of one electron?
What is the charge of one electron?
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The amount of charge that passes a point when a current of 1 ampere flows for 1 second is called 1 _____ .
The amount of charge that passes a point when a current of 1 ampere flows for 1 second is called 1 _____ .
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Which of the following best describes the principle of moments?
Which of the following best describes the principle of moments?
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A charge carrier can be an electron.
A charge carrier can be an electron.
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In translational equilibrium, what must the forces acting to the left equal?
In translational equilibrium, what must the forces acting to the left equal?
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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.
