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Standard IX
Physics
Acceleration
Question

The accelerated motion of a body can occur :
  1. Due to change in its speed only.
  2. Due to change in direction of motion only.
  3. Due to change in both speed and direction of motion.
  4. Due to constancy of velocity.

A
Due to change in its speed only.
B
Due to constancy of velocity.
C
Due to change in both speed and direction of motion.
D
Due to change in direction of motion only.
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Solution
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The correct options are
A Due to change in its speed only.
B Due to change in direction of motion only.
C Due to change in both speed and direction of motion.
The accelerated motion of a body can occur due to a change in its speed only, due to change in direction of motion only, and due to change in both speed and direction of motion. In the uniform circular motion, the direction of speed changes continuously though the speed is constant, still, the motion is accelerated.

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Q1

Assertion: The accelerated motion of an object may be due to change in magnitude of velocity or direction of velocity or both.

Reason: Acceleration can be produced only by change in the magnitude of the velocity.


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Q2
The accelerated motion of a body changes due to change in:
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Q3
According to Newton's second law of motion, a body accelerates due to a change in its momentum.
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Q4
If a body is moving with a constant speed along a straight line; then in order to change its direction of motion, an external force has to be applied in a direction normal to the direction of motion.
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Q5
State whether true or false.
If a body is moving with a constant speed along a straight line, then in order to change its direction of motion, an external force or its component has to act in a direction normal to the direction of motion.
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