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प्रश्न
Distinguish between speed and velocity.
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उत्तर
| Speed | Velocity | |
|
1. |
Speed is simply the rate of change of motion. or simply, it is the distance travelled by a body in a unit of time. |
Velocity is direction-aware, and it is the rate of change of position of an object. |
| 2. | Speed is a scalar quantity, i.e. it has only magnitude. | Velocity is a vector quantity, i.e. it has both magnitude and direction. |
| 3. | Speed measures the distance travelled (d) over the change in time (Δt). | Velocity measures displacement (or change in position, Δs) over the change in time (Δt). |
|
4. |
Speed = `"Distance"/"time"` = dt |
Velocity = `"Displacement"/"Time"` = st |
| 5. | Speed ascertains how fast a body moves. | Velocity ascertains the object's speed and the direction it takes while moving. |
|
6. |
Example: A person is making a roundabout journey at a speed of 30 mph. |
Example: A woman plans to drive her car at 56 mph in East Mumbai. |
संबंधित प्रश्न
Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging?
- from A to B and
- from A to C?
What name is given to the speed in a specified direction ?
Arrange the following speed in increasing order (keeping the least speed first):
An athlete running with a speed of 10 m/s.
Arrange the following speed in increasing order (keeping the least speed first):
A bicycle moving with a speed of 200 m/min.
An aircraft travelling at 600 km/h accelerates steadily at 10 km/h per second. Taking the speed of sound as 1100 km/h at the aircraft’s altitude, how long will it take to reach the ‘sound barrier’ ?
Convert a speed of 54 km/h into m/s.
A bus moving along a straight line at 20 m/s undergoes an acceleration of 4 m/s2. After 2 seconds, its speed will be:
Give an example of the motion of a body moving with a constant speed but with a variable velocity. Draw a diagram to represent such a motion.
A body moves from rest with uniform acceleration and travels 270 m in 3 s. Find the velocity of the body at 10 s after the start.
Which of the following figures (Fig. 8.3) represents uniform motion of a moving object correctly?
