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Questions and Answers
What is a physical quantity?
What is a physical quantity?
- An object that takes up space.
- Something that cannot be measured.
- A theoretical concept.
- Something that can be measured. (correct)
A scalar quantity is defined by what?
A scalar quantity is defined by what?
- Magnitude and direction.
- Direction only.
- Magnitude only. (correct)
- Neither magnitude nor direction.
If you add one scalar quantity to another scalar quantity, what are you finding?
If you add one scalar quantity to another scalar quantity, what are you finding?
- The derivative.
- The integral.
- The sum. (correct)
- The limit.
What is the total mass of a 50 kg box with a 10 kg book on top of it?
What is the total mass of a 50 kg box with a 10 kg book on top of it?
If the temperature in a room decreases from 25°C to 20°C, what is the change in temperature?
If the temperature in a room decreases from 25°C to 20°C, what is the change in temperature?
What defines a vector quantity?
What defines a vector quantity?
Which of the following is an example of a vector quantity?
Which of the following is an example of a vector quantity?
How is the magnitude of a vector represented in a diagram?
How is the magnitude of a vector represented in a diagram?
What is the direction of a vector?
What is the direction of a vector?
Compared to scalar quantities, what additional characteristic do vector quantities possess?
Compared to scalar quantities, what additional characteristic do vector quantities possess?
What type of quantities do scientists often measure?
What type of quantities do scientists often measure?
A resultant force is the combination of all forces acting on an object.
A resultant force is the combination of all forces acting on an object.
When forces are balanced, what is the value of the resultant force?
When forces are balanced, what is the value of the resultant force?
Two forces acting in the same __________ produce a greater resultant force.
Two forces acting in the same __________ produce a greater resultant force.
What are vector diagrams used for?
What are vector diagrams used for?
Flashcards
Physical Quantity
Physical Quantity
Something that can be measured.
Scalar Quantities
Scalar Quantities
Physical quantities with only a magnitude (size).
Magnitude
Magnitude
The size or amount of something, expressed as a numerical value.
Sum of Scalars
Sum of Scalars
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Subtracting Scalars
Subtracting Scalars
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Vector Quantities
Vector Quantities
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Vector Representation
Vector Representation
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Vector Direction
Vector Direction
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Scalar vs. Vector
Scalar vs. Vector
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Resultant Force
Resultant Force
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Balanced Forces
Balanced Forces
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Forces in Same Direction
Forces in Same Direction
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Forces in Opposite Directions
Forces in Opposite Directions
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Free Body Diagrams
Free Body Diagrams
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Study Notes
- Physical quantities are measurable attributes.
- Scalar quantities possess only magnitude.
- The sum of scalar quantities is calculated by adding their values.
- As an example, the total mass of a 75 kg climber with a 15 kg backpack is calculated by adding 75kg + 15kg.
- Scalar quantities can be subtracted by subtracting one value from another.
- For example, the increase in temperature in a room heated from 12°C to 21°C is calculated by subtracting 12°C from 21°C.
- Vector quantities possess both magnitude and direction.
- The direction of a vector can be given in a written description, or drawn as an arrow.
- The length of an arrow represents the magnitude of the vector quantity when drawn.
- The resultant force is a single force with the same effect as two or more forces acting together.
- The resultant force of two forces acting in a straight line can be easily calculated.
- Forces acting in the same direction produce a resultant force that is greater than either individual force, and are calculated by adding the magnitudes of the two forces together.
- Forces acting in opposite directions produce a resultant force that is smaller than either individual force, and is calculated by subtracting the magnitude of the smaller force from the magnitude of the larger force.
- Free body diagrams describe situations where several forces act on an object.
- Vector diagrams are used to resolve a single force into two forces acting at right angles to each other.
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Description
Explore scalar quantities, which are measurable attributes possessing only magnitude. Learn how to calculate the sum and difference of scalar quantities using real-world examples like calculating total mass and temperature change. Understand the fundamental properties of scalars.
