Which of the following statements is false-If speed is zero- then its velocity also must be zero-If speed is constant- then its velocity also-must be constant-If velocity is constant- then its speed also must be constant-If velocity is zero- then its speed also must be zero-

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Standard VIII

Physics

Velocity

Which of the ...

Question

Which of the following statements is false?

If speed is zero, then its velocity also must be zero.

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If velocity is zero, then its speed also must be zero.

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If speed is constant, then its velocity also must be constant.

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If velocity is constant, then its speed also must be constant.

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Solution

The correct option is C
If speed is constant, then its velocity also must be constant.

It is not necessary for velocity to be constant even if its speed is constant.

Speed a scalar quantity only has magnitude. Whereas velocity being a vector quantity has both magnitude and direction. i.e. the velocity of the object changes even when the direction of motion changes. So, if a body is changing its direction without changing its speed, then its velocity will change.

For example, a body in uniform circular motion has a constant speed, but its velocity changes as the direction of motion of the body changes.

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Similar questions

Read each statement below carefully and state with reasons and examples, if it is true or false;
A particle in one-dimensional motion
a) with zero speed at an instant may have non-zero acceleration at that instant
b) with zero speed may have non-zero velocity,
c) with constant speed must have zero acceleration,
d) with positive value of acceleration must be speeding up.

Q. Read each statement below carefully and state with reasons and examples, if it is true or false:
A particle in one-dimensional motion
(a) with zero speed at an instant may have non-zero acceleration at that instant.
(b) with zero speed may have non-zero velocity.
(c) with constant speed must have zero acceleration.
(d) with positive value of acceleration must be speeding up.

Q. The velocity of a particle is zero at t = 0.
(a) The acceleration at t = 0 must be zero.
(b) The acceleration at t = 0 may be zero.
(c) If the acceleration is zero from t = 0 to t = 10 s, the speed is also zero in this interval.
(d) If the speed is zero from t = 0 to t = 10 s the acceleration is also zero in this interval.

Which of the following statement is false?

1. If speed is zero , it's velocity also must be zero.

2. if velocity is zero , then it's speed need not be zero

3. If speed is constant , then it's speed must be constant .

4. If velocity is constant , then it's speed must be constant.

Q. If the speed of an object is zero , its velocity must also be zero. Do you agree with this statement?

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