A toy train moves around a circular track at a constant speed. Which statement correctly describes its motion?
The train changes its direction continuously while moving with constant speed.
Speed is a scalar and tells us how fast an object is moving; velocity is a vector and also tells us the direction of motion. On a circular track the tangent to the path (i.e. the direction of motion) is different at every point.
So even though the toy train's speed stays the same, its direction of motion is continuously changing as it goes round the loop. It is not stationary, is not speeding up, and is not moving in a straight line.
Hence, the answer is The train changes its direction continuously while moving with constant speed.
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