Match the following. List I List II 1. Motion of a body covering equal distances in equal interval of time. A. 2. Motion with non uniform acceleration. B. 3. Constant retardation. C. 4. Uniform acceleration. D.

1. Motion of a body covering equal distances in equal interval of time- (D) As we know that when an object covers equal distances in equal interval of time, then its motion is said to be a uniform motion. In uniform motion, velocity of the particle remains constant and acceleration is zero. 2. Motion with non uniform acceleration- (C) The slope of the velocity-time graph gives acceleration. A straight line graph inclined on time axis shows constant or uniform acceleration. If the slope of velocity-time graph is varying with time then it shows the non uniform acceleration. 3. Constant retardation- (A) A body has retardation when its velocity decreases with time. When velocity decreases with the uniform rate then graph will be a straight line with negative slope. 4. Uniform acceleration- (B) We know that slope of the velocity-time graph gives acceleration. When slope is constant then acceleration is also constant. And velocity of the particle increases at the constant rate. List I List II 1. Motion of a body covering equal distances in equal interval of time. D. 2. Motion with non uniform acceleration. C. 3. Constant retardation. A. 4. Uniform acceleration. B.

Velocity is defined as the rate of change of displacement. It is a vector quantity. It SI unit is m / s . Velocity can change due to change in its magnitude or direction or both. Note: During uniform motion, instantaneous velocity and average velocity are same.

E M B I B E

Science Standard 9>Chapter 2 - Motion>textbook exercises>Q iii

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9th Tamil Nadu Board

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State whether true or false. If false, correct the statement.

If the velocity – time graph of a particle is a straight line inclined to X-axis then its displacement – time graph will be a straight line.

Important Questions on Motion

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9th Tamil Nadu Board

IMPORTANT

Science Standard 9>Chapter 2 - Motion>textbook exercises>Q v

Match the following.

List I	List II
1. Motion of a body covering equal distances in equal interval of time.	A.
2. Motion with non uniform acceleration.	B.
3. Constant retardation.	C.
4. Uniform acceleration.	D.