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
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?
Arrange the following speed in increasing order (keeping the least speed first):
An athlete running with a speed of 10 m/s.
Write the formula for acceleration. Give the meaning of each symbol which occurs in it.
If a sprinter runs a distance of 100 metres in 9.83 seconds, calculate his average speed in km/h.
A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.
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.
The speed of a car is 72 km h-1. Express it in m s-1.
A train travels with a speed of 60 km h-1 from station A to station B and then comes back with a speed 80 km h-1 from station B to station A. Find -
- The average speed
- The average velocity of the train.
What is the relation between distance and time when the body is moving with variable velocity?
Derive th e equation of motion.
S = ut+ `1/2` at2,
Where the symbols have their usual meanings
