Below are four statements about acceleration. Which statement is not correct? A Acceleration always involves changing speed. B Changing direction always involves acceleration. C Changing speed always involves acceleration. D Circular motion always involves acceleration.
Answers
Considering all the standard characteristics of acceleration, which involves the change in velocity concerning time, the statements (B), (C) and (D) are correct.
The given problem is based on the concepts and the fundamentals of acceleration. Acceleration is defined as the rate of change of velocity. Velocity is a vector quantity and is defined as speed in a given direction. Therefore, when any or both of the components of velocity is changing with time, a body is said to be accelerating i.e. acceleration involves a change of speed or change in direction, or a change in both speed and direction.
Now, as per the given problem,
A. Acceleration always involves changing speed is an incorrect statement because acceleration can occur when speed is constant but direction is changing.
B. Changing direction always involves acceleration is a correct statement because, a change in direction results in a change in velocity.
C Changing speed always involves acceleration is a correct statement because, changing speed results in a change in velocity.
D. Circular motion always involves acceleration is also a correct statement because in circular motion the direction is always changing, and this results in a change in velocity.
Thus, we can conclude that considering all the standard characteristics of acceleration, which involves the change in velocity concerning time, the statements (B), (C) and (D) are correct.
Learn more about the acceleration here:
Answer:
A. Acceleration always involves changing speed.
Explanation:
Acceleration is defined as the rate of change of velocity.
Velocity is a vector quantity and is defined as speed in a given direction. Therefore, when any or both of the components of velocity is changing with time, a body is said to be accelerating i.e. acceleration involves a change of speed or change in direction, or a change in both speed and direction.
Considering the statements:
A. Acceleration always involves changing speed is false because acceleration can occur when speed is constant but direction is changing.
B. Changing direction always involves acceleration is true because, a change in direction results in a change in velocity.
C Changing speed always involves acceleration is true because, changing speed results in a change in velocity.
D. Circular motion always involves acceleration is true because in circular motion the direction is always changing, and this results in a change in velocity
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