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Questions and Answers
What physical quantities are needed to describe the motion of an object along a straight line?
What physical quantities are needed to describe the motion of an object along a straight line?
- Scalars and vectors
- Velocity and acceleration
- Position, displacement, velocity, and acceleration (correct)
- Position and displacement
What is necessary to enable the use of vectors for defining velocity and acceleration in a plane?
What is necessary to enable the use of vectors for defining velocity and acceleration in a plane?
- Graphical method for adding vectors
- Subtraction of vectors
- Resolution of vectors
- Learning the language of vectors (correct)
Why do we need to use vectors to describe the motion of an object in two dimensions or three dimensions?
Why do we need to use vectors to describe the motion of an object in two dimensions or three dimensions?
- To emphasize the magnitude of the quantities
- To include the directional aspect of the physical quantities (correct)
- Because only two directions are possible in two dimensions
- To simplify the calculations
What method is used for adding and subtracting vectors graphically?
What method is used for adding and subtracting vectors graphically?
In which type of motion is projectile motion treated in detail?
In which type of motion is projectile motion treated in detail?
What concepts are needed to describe the motion of an object along a straight line?
What concepts are needed to describe the motion of an object along a straight line?
Which of the following is an example of a scalar quantity?
Which of the following is an example of a scalar quantity?
What is the distinguishing feature of a vector quantity?
What is the distinguishing feature of a vector quantity?
How are scalar quantities combined?
How are scalar quantities combined?
What is used to represent a vector in the text?
What is used to represent a vector in the text?
Which physical quantity is an example of a vector quantity?
Which physical quantity is an example of a vector quantity?
What does a scalar quantity lack compared to a vector quantity?
What does a scalar quantity lack compared to a vector quantity?
How is a vector quantity specified in the text?
How is a vector quantity specified in the text?
Which quantity can be represented by both bold face type and an arrow over the letter?
Which quantity can be represented by both bold face type and an arrow over the letter?
What is the distinguishing feature of a scalar quantity?
What is the distinguishing feature of a scalar quantity?
What does a vector quantity have that a scalar quantity does not?
What does a vector quantity have that a scalar quantity does not?
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Study Notes
Describing Motion
- To describe the motion of an object along a straight line, physical quantities such as distance, displacement, speed, velocity, and acceleration are needed.
- To use vectors for defining velocity and acceleration in a plane, two-dimensional coordinates are necessary.
Vector Quantities
- Vectors are needed to describe the motion of an object in two dimensions or three dimensions because they have both magnitude and direction.
- The distinguishing feature of a vector quantity is that it has both magnitude and direction.
- A vector quantity is specified by its magnitude and direction.
- Vector quantities can be represented by bold face type or an arrow over the letter.
Scalar Quantities
- A scalar quantity is an example of a quantity that lacks direction.
- The distinguishing feature of a scalar quantity is that it has only magnitude.
- Scalar quantities are combined by simple addition and subtraction.
Graphical Representation
- Vectors are added and subtracted graphically using the head-to-tail method.
Projectile Motion
- Projectile motion is treated in detail as a type of motion that involves both horizontal and vertical components.
Representing Quantities
- Vectors are represented by bold face type or an arrow over the letter, while scalar quantities are represented by plain type.
- Distance, displacement, speed, velocity, and acceleration are physical quantities that can be represented by vectors.
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