Question

If the speed of an object moving along a straight line keeps changing, its motion is said to be

• A. Uniform
• B. Non-uniform
• C. Circular
• D. None of these

Answer 1

The correct option is B

Non-uniform

The explanation for the correct answer: option B:

1. When a body covers an unequal distance in equal intervals of time whatsoever small the interval may be the body is said to be in non-uniform motion.
2. Therefore, in non-uniform motion, the speed of an object changes with respect to time.

The explanation for the correct answer: option A:

1. When a body covers an equal distance in equal intervals of time whatsoever small the interval may be the body is said to be in uniform motion.
2. Therefore, in uniform motion, the speed of an object doesn't change with respect to time.

The explanation for the correct answer: option C:

1. When a body is moving in a circular path the motion is termed circular motion.
2. Now, circular motion can be uniform or non-uniform.
3. When the speed of a body in circular motion remains the same, it is said to be in a uniform circular motion. However, if the speed of a body in circular motion doesn't remain the same it is said to be in a non-uniform circular motion.

Hence, if the speed of an object moving along a straight line keeps changing, its motion is said to be in non-uniform motion. Therefore, Option B is correct.