30 Most Important Conceptual Questions of Circular Motion

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Problem 1

When a particle moves in a circle with a uniform speed
  1. its velocity and acceleration are both constant.
  2. its velocity is constant but the acceleration changes.
  3. its acceleration is constant but the velocity changes.
  4. its velocity and acceleration both change.

Problem 2

Two cars having masses m1, and m2 move in circles of radii r1, and r2 respectively. If they complete the circle in equal time, the ratio of their angular speeds $\omega$1, $\omega$1 is:
  1. m1 /m2
  2. r1 /r1
  3. m1 r1 / m2r2
  4. 1

Problem 3

A car moves at a constant speed on a road as shown in the following figure. The normal force by the road on the car is Na and Nb when it is at the points A and B, respectively. graph
  1. Na = Nb
  2. Na > Nb
  3. Na < Nb
  4. insufficient information to decide the relation between Na and Nb

Problem 4

A particle of mass m is observed from an inertial frame of reference and is found to move in a circle of radius r with a uniform speed v. The centrifugal force on it is :
  1. $\frac{m v^{2}}{r}$ towards the center.
  2. $\frac{m v^{2}}{r}$ away from the center.
  3. $\frac{m v^{2}}{r}$ along the tangent through the particle.
  4. zero

Problem 5

A particle of mass m rotates with a uniform angular speed $\omega$. It is viewed from a frame rotating about the Z-axis with a uniform angular speed $\omega$oin a circle of radiua 'a'. The centrifugal force on the particle is:
  1. m$\omega$2a
  2. m$\omega$o2a
  3. m$ (\frac{\omega + \omega_{o}}{2})^{2}$a
  4. m$\omega \omega$oa

Problem 6

A particle is kept fixed on a turntable rotating uniformly. As seen from the ground the particle goes in a circle, its speed is 20 cm/s and acceleration is 20 cm/s2. The particle is now shifted to a new position to make the radius half of the original value. The new values of the speed and acceleration will be :
  1. 10 cm/s, 10 cm/s2
  2. 10 cm/s, 80 cm/s2
  3. 40 cm/s, 10 cm/s2
  4. 40 cm/s, 40 cm/s2

Problem 7

A stone of mass m tied to a string of length 1 is rotated in a circle with the other end of the string as the centre. The speed of the stone is v. If the string breaks, the stone will move :
  1. towards the centre
  2. away from the centre
  3. along a tangent
  4. will stop

Problem 8

A coin placed on a rotating turntable just slips if it is placed at a distance of 4 cm from the centre. If the angular velocity of the turntable is doubled, it will just slip at a distance of :
  1. 1 cm
  2. 3 cm
  3. 4 cm
  4. 8 cm

Problem 9

Problem 10

Problem 11

Problem 12

Problem 13

Problem 14

Problem 15

Problem 16

Problem 17

Problem 18

Problem 19

Problem 20

Problem 21

Problem 22

Problem 23

Problem 24

Problem 25

Problem 26

Problem 26

Problem 27

Problem 28

Problem 29

Problem 30

  • Answers
    1 - d)2 - d)3 - c)4 - d)5 - b)
    6 - a)7 - 8 - c)9 - 10 -
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