Understanding Uniform and Non-Uniform Motion

Physics

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Uniform motion

A body is said to be in uniform motion if its velocity does not change with time. For a body in uniform motion, net external force is always equal to zero. An example of uniform motion is a body sliding on a frictionless surface with a constant velocity. 

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Non-uniform Motion

A body is said to have non-uniform motion if its velocity changes with time. Such a body is necessarily under the influence of an external force. An example of non-uniform motion is a body rotating at a constant speed. Its velocity is not constant because its direction of motion changes every instant. 

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Uniform v/s Non-uniform motion

S.No.Uniform MotionNon-Uniform motion
1.Velocity is constant with time.Velocity changes atleast once in the given interval of time.
2.External force is zero.External force is non-zero.
3. Ideal scenario.Realistic scenario.
4.Ex: Body moving on a frictionless tableEx: Body under freefall

REVISE WITH CONCEPTS

Speed

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Basic Introduction to Velocity

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Average Speed and Average Velocity

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Instantaneous Velocity and Instantaneous Speed

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Velocity - Time Graph

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Important Questions

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is : 

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A man walks on a straight road from his home to a market  away with a speed of . Finding the market closed, he instantly turns and walks back home with a speed of . What is the
(a) magnitude of average velocity, and
(b) average speed of the man over the interval of time
(i)  to ,
(ii)  to  
(iii)  to

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The position of an object moving along x-axis is given by x = a + , where a = 8.5 m and b = 2.5 m and t is measured in seconds. The average velocity of the object between t = 2 s and t = 4 s is

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A car travels from A to B at a, speed of and returns at a speed of . The average speed of the car for the whole journey is:

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A car travels the first one third of a certain distance with a speed of 10 km/hr, the next one third with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr The average speed of the car for the whole journey is

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A car covers the first half the distance  between two places at 40 km/h another half at 60 km/h, the average speed of car

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An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

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A particle moving in a straight line covers half the distance with speed of . The other half of the distance is covered in two equal time interval with speed of and respectively. The average speed of the particle during this motion is 

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A car moving on a straight road covers one third of a certain distance with 20 Km/h and the rest with 60 Km/h. The average speed is :

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Joseph Jogs from one end  to the other end  of a straight  road in  minutes  seconds and then turns around and jogs  back to point  in another  minute. What are Joseph's average speeds and velocities in jogging (a) from  to  and (b) from  to ?

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