Two statements are given below - one labelled Assertion (A) and the other labelled Reason (R). Read the statements carefully and choose the option that correctly describes statements (A) and (R). Assertion (A): An object can continue moving in a circular path even in the absence of centripetal force. Reason (R): Centripetal force is the real force that continuously pulls the object toward the center of the circular path.
A is false, but R is true
Uniform circular motion needs a net force directed towards the centre, called the centripetal force, of magnitude \(F=\dfrac{mv^{2}}{r}\). It is supplied by real forces such as string tension, gravity or friction, and it constantly changes the direction of the velocity.
Step 1 — Check the Assertion. By Newton's first law, a body with no net force moves in a straight line at constant speed. If the centripetal force disappears (for example, a whirled string snaps), the object flies off along the tangent instead of continuing in a circle. So the Assertion is false.
Step 2 — Check the Reason. The centripetal force is a real force (provided by tension, gravitational pull, friction and so on) that continuously pulls the object towards the centre of the circular path. So the Reason is true.
Step 3 — Since the Assertion is false, every choice that calls both statements true fails, and the choice that calls the Assertion true and the Reason false is also wrong.
A is false, but R is true option is correct.
Important Questions from Motion
An object is covering distance in direct proportion to the square of time elapsed. What conclusion can be drawn about the motion of the object?
If the distance time graph of the motion of an object is a straight line but not parallel to the time axis, then it may be concluded that the object is moving with a:
Vehicles have treaded tires so that it_______.
What is the formula for momentum?
Momentum of a given body is doubled. Its kinetic energy becomes (mass not changed)
