Question

Why can we not use uniform motion to describe object in circular motion?

Answer 1

Answer:

Work done is equal to Force (acting in the direction of displacement) times the displacement i.e. W=F.S where (.) is dot product. For the work done we need component of force along the direction of displacement but displacement and force are 90°, at each and every point on the circular track and therefore the component of force along the direction of displacement will always be zero in case of a body moving in a circular track or a body performing circular motion. We know W=F.S or F.Scos(θ), since body is moving in circular track cos(θ)=0 , and hence whole term will be 0 i.e. Work done will be 0.

Explanation:

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Answer 2

Because of the frequent change of direction, velocity is not constant.

• Since the direction is continuously changing in uniform circular motion, the velocity is not constant and the motion is not uniform.
• An item moves in a circular direction while continuously accelerating, which is known as uniform circular motion. When an object moves in a circular path while experiencing varied acceleration, it is said to be moving uniformly. When an object moves in a circular path at a constant speed, it is said to be in uniform circular motion.
• If the angular rate of rotation and speed are both constant, the circular motion can be uniform. If the rotation's angular rate changes over time, the motion may not be uniform. Circular motion can be seen in an electron travelling perpendicular to the magnetic field.
• While it is non-zero in non-uniform circular motion, the angular acceleration is zero in uniform circular motion. - An illustration of uniform circular motion is the Earth's rotation around the Sun. - An illustration of non-uniform circular motion is the vertical circular motion of an item in the vertical plane.
• Uniform circular motion is defined as a body moving at a constant speed around a circle. The speed of a racing car is not consistent (its either accelerating or decelerating). It is not a circular motion that is constant.

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