motion flashcards

All 19 cards

1. Card 1

   Define translational motion and distinguish it from rotational motion.

   Translational motion involves movement in a straight or curved path where all parts of an object move the same distance and direction. In contrast, rotational motion describes an object spinning around a fixed axis, resulting in circular movement.

2. Card 2

   Why is understanding motion important in daily life?

   Understanding motion allows us to make critical decisions by accurately describing movement. This helps us interpret the world around us, answering practical questions such as how long something will take or if it is safe to cross a path.

3. Card 3

   What is the key difference between distance and displacement?

   Distance is the total length of the path traveled, regardless of direction, and is a scalar quantity. Displacement, however, is the straight-line change in position from the start to the end, taking direction into account, and is a vector quantity.

4. Card 4

   How is velocity defined, and what is its SI unit?

   Velocity is defined as the displacement divided by the time interval, indicating the rate at which an object changes position, including both speed and direction. Its SI unit is meters per second (m/s).

5. Card 5

   Which of the following best describes rotational motion?

   • A. Movement in a straight line.
   • B. Movement where all parts of an object move the same distance and direction.
   • C. An object spinning around a fixed axis. (correct)
   • D. Movement that only considers the total path traveled.

6. Card 6

   Explain how the direction of velocity is indicated.

   The direction of velocity is indicated by its sign. A positive (+) sign typically denotes movement in a designated 'forward' direction, such as East or North, while a negative (-) sign indicates movement in the opposite direction.

7. Card 7

   What type of motion is primarily focused on in the lesson regarding translational motion?

   The lesson primarily focuses on one-dimensional or straight-line motion within the broader category of translational motion.

8. Card 8

   If you walk 5m forward and then 5m back to your starting point, what is your total displacement?

   • A. 0m (correct)
   • B. 5m
   • C. 10m
   • D. -5m

9. Card 9

   Distinguish between speed and velocity.

   Speed is a scalar quantity that tells us how fast something is moving, ignoring direction. Velocity, on the other hand, is a vector quantity that describes both the rate at which an object changes position and its direction.

10. Card 10

    Which of the following is a scalar quantity?

    • A. Speed (correct)
    • B. Velocity
    • C. Displacement
    • D. Acceleration

11. Card 11

    Why is it important for all parts of an object to move the same distance and direction in one-dimensional translational motion?

    It is important because this characteristic defines one-dimensional translational motion. If different parts of the object moved differently, it would indicate rotational motion or a more complex form of movement, rather than simple straight-line translation.

12. Card 12

    What does the term 'average velocity' signify?

    Average velocity signifies the overall rate of change in position over a given time interval. It is calculated by dividing the total displacement by the total time taken.

13. Card 13

    If an object's velocity is negative, what does this typically indicate about its direction of motion?

    • A. It is speeding up.
    • B. It is moving in the designated 'backward' or West/South direction. (correct)
    • C. It is slowing down.
    • D. It has stopped moving.

14. Card 14

    Give an example of rotational motion.

    An example of rotational motion is a fan spinning around its central axis or the Earth rotating on its axis.

15. Card 15

    How does the concept of 'motion in our world' relate to making critical decisions?

    The concept of 'motion in our world' relates to making critical decisions by enabling us to accurately describe and interpret movement. This understanding allows us to answer practical questions about duration or safety, which are crucial for daily choices.

16. Card 16

    A car moves 55 meters east in 5 seconds, then moves 33 meters west in 11 seconds. What are the velocities for each motion?

    For the first motion, the velocity is 11 m/s east (55m / 5s). For the second motion, the velocity is -3 m/s west (-33m / 11s), indicating movement in the opposite direction.

17. Card 17

    What does acceleration describe, and what are the different ways velocity can change to result in acceleration?

    Acceleration describes how velocity changes over time. This includes speeding up (increasing magnitude of velocity), slowing down (decreasing magnitude of velocity), or changing direction while maintaining speed.

18. Card 18

    A skateboarder increases speed from 2 m/s to 8 m/s in 3 seconds. What is the acceleration?

    • A. 2 m/s^2 (correct)
    • B. 6 m/s^2
    • C. 0.5 m/s^2
    • D. 18 m/s^2

19. Card 19

    A bus is moving at 20 m/s east. It slows down and stops completely in 5 seconds. What is the acceleration of the bus?

    The acceleration of the bus is -4 m/s^2. The final velocity is 0 m/s, and the initial velocity is 20 m/s. So, (0 m/s - 20 m/s) / 5 s = -20 m/s / 5 s = -4 m/s^2. The negative sign indicates deceleration or acceleration in the opposite direction of initial motion.

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