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Questions and Answers
What is a 'particle'?
What is a 'particle'?
- A part of a whole
- An object that can be represented as a single point in time
- An object that has no top or bottom, no front or back
- An object that can be represented as a mass at a single point in space (correct)
- Any part of an atom
Which quantities are shown on a complete motion diagram?
Which quantities are shown on a complete motion diagram?
- The position of the object in each frame of the film, shown as a dot
- The average velocity vectors (found by connecting each dot in the motion diagram to the next with a vector arrow)
- The average acceleration vectors (with one acceleration vector linking each two velocity vectors)
- All of the above (correct)
In physics, what is the difference between 'speed' and 'velocity'?
In physics, what is the difference between 'speed' and 'velocity'?
- Velocity is a scalar and speed is a vector
- Speed is a scalar, which is the magnitude of the velocity, which is a vector (correct)
- Speed and velocity mean the same thing
- Speed can be positive or negative, while velocity is always positive
- Velocity is represented by an exact number, while speed is only an approximate number
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Study Notes
Describing Motion
- Motion diagrams are a visual representation of an object's movement, showing its position at different points in time.
- Graphs can illustrate motion, showing quantities like position, velocity, and acceleration.
- Pictures can help visualize and understand different aspects of motion.
- Vectors are crucial for representing quantities like velocity, which have magnitude and direction.
Vectors - Understanding Motion
- Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
- Vectors can be added and subtracted graphically, which is explored further in Chapter 3.
Describing Motion
- A particle is an object represented at a single point in space, simplifying analysis of motion.
- A motion diagram shows the following:
- The position of the object at different times, marked as dots.
- The average velocity vectors, represented by arrows connecting the dots.
- The average acceleration vectors, linked between velocity vectors.
- Velocity is a vector quantity, while speed is a scalar quantity.
- Speed is the magnitude of the velocity vector.
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