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CBSE Class 11-science Answered

<p>An object will continue accelerating until:</p> <p>(A) the resultant force on it begins to decrease</p> <p>(B) the velocity changes direction</p> <p>(C) the resultant force on it is zero</p> <p>(D) the resultant force is at right angles to its direction of motion</p>
Asked by Yash Sahu | 16 Apr, 2014, 12:06: AM
Expert Answer
(A) When the resultant force decreases, the object might still be accelerating. However, it will be negative acceleration.
 
(B) When the velocity changes direction, the acceleration changes. Hence, the body is said to be accelerating.
 
(C) When the resultant force on an object is zero, the acceleration is zero in accordance with Newton's second law a = F/m.
 
(D) When the resultant force is at right angles to the direction of motion, the body is still accelerating (as in the case of circular motion).
 
Hence, the correct option is C.
Answered by | 16 Apr, 2014, 09:51: AM
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