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JAMB Physics 1994 Question 6

Question 6

Motion

Which of the following is TRUE of a particle moving in a horizontal circle with constant angular velocity?

  1. A.The energy is constant but the linear momentum varies
  2. B.The linear momentum is constant but the energy varies
  3. C.Both energy and linear momentum are constant
  4. D.The speed and the linear velocity are both constant.
Show the answer and explanation

Answer: A (The energy is constant but the linear momentum varies)

Explanation

The speed is constant, so the kinetic energy is constant, but the direction of motion keeps changing, so the velocity and the momentum (mv) keep changing.