TS EAMCET · Physics · Laws of Motion
A particle is acted upon by a force of constant magnitude such that its velocity and acceleration are always perpendicular to each other, then its
- A linear momentum is constant
- B kinetic energy is constant
- C velocity is constant
- D acceleration is constant
Answer & Solution
Correct Answer
(B) kinetic energy is constant
Step-by-step Solution
Detailed explanation
\(\vec{F} \cdot \vec{v} = m\vec{a} \cdot \vec{v}\) Given \(\vec{v} \perp \vec{a}\), so \(\vec{a} \cdot \vec{v} = 0\). \(\vec{F} \cdot \vec{v} = 0\) Since Power \(P = \frac{dK}{dt} = \vec{F} \cdot \vec{v}\) \(\frac{dK}{dt} = 0\) Kinetic energy is constant.
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