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Inertial vs Non Inertial Frames

68. Assertion...

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68. Assertion :A negative acceleration of a body can be associated with a 'speeding up' of the body. Reason :Increase in speed of a moving body is independent of its direction of motion.

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Q. Assertion : A negative acceleration of a body can be associated with a ‘slowing down’ of the body.
Reason : Acceleration is a vector quantity.

Q. Assertion :A body with constant acceleration always moves along a straight line. Reason: A body with constant acceleration will speed up.

Mark the correct statement(s)
(1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration.

(2) If velocity of a body is varying, its speed must be varying.

(3) A body moving with varying velocity may have constant speed.

(4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

A s s e r t i o n :

When a particle moves in a circle with a uniform speed, its velocity and acceleration both changes.

R e a s o n :

The centripetal acceleration in circular motion is dependent on angular velocity of the body.

Q. Assertion :A body can have acceleration even if its velocity is zero at a given instant of time. Reason: A body is momentarily at rest when it reverse its direction of motion.

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