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Motion in Straight Line
Question
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Distinguish between speed and velocity.

Answer

Speed Velocity
Speed changes only when the magnitude of the object changes. Velocity changes whenever there is a change in direction and speed of the particle. 
Speed is a scalar quantity. Velocity is a vector quantity. 
Speed is either zero or positive. It cannot be negative.  Velocity can be positive, negative or zero

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Some More Questions From Motion in Straight Line Chapter

What is motion?

Is absolute rest or absolute motion possible?

What is the most essential thing to study the motion of a body?

Can a body be always at rest in some frame?

Can a body be in motion in the frame associated with the body itself?

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?