Advertisements
Advertisements
Question
Define variable velocity and give one example.
Advertisements
Solution
When a body covers unequal distances in equal intervals of time in a specified direction, the body is said to be moving with a variable velocity.
Example: A rotating fan at a constant speed has variable velocity, because of continuous change in direction.
APPEARS IN
RELATED QUESTIONS
What does the path of an object look like when it is in uniform motion?
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?
If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?
A train starting from rest moves with a uniform acceleration of 0.2 m/s2 for 5 minutes. Calculate the speed acquired and the distance travelled in this time.
A car is moving on a straight road with uniform acceleration. The speed of the car varies with time as follows :
Time (s) : 0 2 4 6 8 10
Speed (m/s) : 4 8 12 16 20 24
Draw the speed-time graph by choosing a convenient scale. From this graph :
(1) Calculate the acceleration of the car.
(2) Calculate the distance travelled by the car in 10 seconds.
One of the following is not a vector quantity. This one is :
When is a body said to be in motion?
Figure shows the displacement of a body at different times .
Calculate the average velocity during the time interval 5 s to 9 s ,
[Hint : From 5 s to 9 s , displacement = 7 m - 3m = 4m]
What is the relation between distance and time when the body is moving with uniform velocity?
Write down the type of motion of a body along with the A – O – B of the following distance – time graph.
