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**The momentum of a car moving at a constant speed in a circular track **

- A.
**Can be both positive and negative** - B.
**Can be centripetal** - C.
**Can be zero depending on its position in the track** - D.
**Can be centrifugal**

**QUICK ANSWER…**

**A**

**DETAILS…**

**Be careful with this question, your understanding of the basic difference between a vector quantity (like velocity) and a scalar quantity (like speed) will make the difference.**

**A body may be travelling with constant speed in a circle, but this does not imply that the velocity is also constant. This is because velocity is a vector which in addition to magnitude, also depends on direction.**

**Now, as the body moves with constant speed IN A CIRCLE, its velocity will not be constant, but will be changing as the direction of the body changes.**

**However, because momentum is simply another vector which can be calculated as = mass X change in velocity, the only condition for a zero momentum is if the velocity is constant, but fortunately we have a changing velocity.**

**Hence, the momentum for a body travelling in a circle can never be zero but may be negative or positive depending on the current direction of the body.**

**Now for the right answer to the above question:**

**Option A is correct. depending on the direction, a body moving in a circle will have either positive or negative momentum.****Option B is incorrect. cannot be centripetal because the direction of movement is not away from the center but along the circumference of the circle.****C is incorrect. can NEVER be zero as long as it moves in a circular path.****D is not the correct answer. cannot be centrifugal because the direction of movement is not towards the center but along the circumference of the circle**

**KEY-POINTS…**

**You may please note these/this:**

**The velocity, momentum, and acceleration of a body moving in a circular path can never be zero.****This is because the direction of the body will always be changing, making its velocity to follow suit.**

**Use the questions and answers session to deal further on this topic…**

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**/ culled from 2019 JAMB-UTME physics question 37 /**