Free Rotational and Circular Motion MCQs with Answers
521 Rotational and Circular Motion MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Angular displacement and angular velocity describe rotation, with angles measured in radians and related to time through angular speed. The connection between angular and linear quantities includes arc length, tangential speed and centripetal acceleration, so circular motion is not confused with motion at constant velocity.
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Read the Rotational and Circular Motion notesFree MDCAT chapter notes with key terms521 questions · page 8 of 27
- A. 205N
- B. 305N
- C. 405N
- D. 505N
Explanation: The formula for centripetal force is Fc = mv²/r, where:m is the mass of the car (500 kg)v is the speed of the car (9 m/s)r is the radius…
Correct answer: 405N- A. 205 N
- B. 305 N
- C. 405 N
- D. 505 N
Explanation: F = mv2 / RF = 500 × 9 × 9 / 100F = 405 N
Correct answer: 405 N- A. The resultant force acts towards the centre of the circle
- B. There is no resultant force
- C. The resultant force acts away from the centre of the circle
- D. None of these options are correct
Explanation: The resultant force, being the centripetal force, always acts towards the center of the circle in situations where an object is moving in…
Correct answer: The resultant force acts towards the centre of the circle- A. V/r
- B. r/V
- C. ma
- D. None of these options are correct
Explanation: The formulae for centripetal acceleration are: a = vω a = rω2 a = v2/r where v is the linear speed, r is the radius and ω is angular…
Correct answer: None of these options are correct- A. Increasing
- B. Decreasing
- C. Constant
- D. None of these options are correct
Explanation: We know that centripetal acceleration (a) = v2/r where v is the linear speed and r is the radius.
Correct answer: Decreasing- A. 20 m/s2
- B. 40 m/s2
- C. 30 m/s2
- D. 10 m/s2
Explanation: The formula for centripetal acceleration =v2/r, hence, 202/20=20m/s2
Correct answer: 20 m/s2- A. Revolution
- B. Rotation
- C. Both of them
- D. None of them
Explanation: If an object is undergoing an orbital motion around another object it is called revolution.
Correct answer: Revolution- A. 0°
- B. π /2
- C. 2π
- D. none of these
Explanation: Consider a particle P is moving along a circle with center as the origin as shown in the figure.
Correct answer: none of these- A. 0°
- B. π
- C. 2π
- D. none of these
Explanation: When a particle moves in a circular path, the radius vector points from the center of the circle to the particle, while the centripetal…
Correct answer: π- A. The daily rotation of the earth about its own axis
- B. Jumping of a paratrooper from an helicopter
- C. Flow of a viscous liquid
- D. Rotation of flywheel about its axle
- E. Both the daily rotation of the earth and flywheel about its own axis
Explanation: Spin motion is the movement of an object about its own axis, which is depicted by;(i) the daily motion of the earth(ii)flywheel rotation…
Correct answer: Both the daily rotation of the earth and flywheel about its own axis- A. A ring about its axis perpendicular to the plane of the ring
- B. A solid sphere about one of its diameters
- C. A spherical shell about one of its diameters
- D. A disc about its axis perpendicular to the plane of the disc
Explanation: The moment of inertia for a thin ring is given by I = mr2, where m is the mass and r is the radius.
Correct answer: A ring about its axis perpendicular to the plane of the ring- A. Linear velocity
- B. Linear momentum
- C. Linear acceleration
- D. Inertia
Explanation: Angular momentum is completely analogous to linear momentum. It has the same implications in terms of carrying rotation forward, and it is…
Correct answer: Linear momentum- A. 4.42 m/s
- B. 5.42 m/s
- C. 7.42 m/s
- D. 8.42 m/s
- E. 9.42 m/s
Explanation: Linear speed = Distance / Time Distance = 5 × 2 × pi × r = 5 × 2 × 22/7 × 0.6 = 132 / 7 = 18.85 m speed = 18.85 / 2 = 9.42 m/s
Correct answer: 9.42 m/s- A. Angular momentum... Angular velocity.... Linear momentum....Linear velocity
- B. Linear velocity...Linear momentum.... Angular velocity.... Angular momentum
- C. Linear momentum.... Angular momentum...... Linear velocity.... Angular velocity
- D. Angular velocity.... Angular momentum..... Linear momentum..... Linear velocity
Explanation: A body with translatory motion possesses momentum of two types, linear and angular.
Correct answer: Linear velocity...Linear momentum.... Angular velocity.... Angular momentum- A. 1.0 x 10⁴ N
- B. 3.0 x 10⁴ N
- C. 5.0 x 10⁴ N
- D. 7.0 x 10⁴ N
- E. 9.0 x 10⁴ N
Explanation: Given: mass = 1000kgvelocity = 10m/s radius = 10 mFind: F(centripetal force)=? Formula:F= mv²/r F= 1000×10²/10F= 10000F = 1×10⁴N
Correct answer: 1.0 x 10⁴ N- A. 2400 N
- B. 1200 N
- C. 400 N
- D. 4800 N
Explanation: The formula for the centripetal force will be used here, which is: F=mv2/r Where m is the mass, v is the velocity and r is the radius.
Correct answer: 2400 N- A. 6.5 m
- B. 7.0 m
- C. 7.5 m
- D. 1.75 m
Explanation: The formula to be used here:S=rθ {where S is the arc length or the linear displacement, r is the radius and θ is the angle in radians}S=…
Correct answer: 7.0 m- A. 170
- B. 160
- C. 360
- D. 420
Explanation: The ratio of diameters is 30:20=3:2. The circumferences are also in the same ratio of diameters.
Correct answer: 360- A. 3.2 m/s
- B. 5.4 m/s
- C. 7.8 m/s
- D. 9.2 m/s
Explanation: This is the following solution: Let m and l be the mass and the length of the meter stick respectively then its center will be situated at…
Correct answer: 5.4 m/s- A. 5 : 2
- B. 5 : 8
- C. 4 : 1
- D. 2 : 1
Explanation: This is the following solution: Moment of inertia of a solid sphere=2/5mr², Moment of inertia of disk=1/2mr² By taking their ratio answer…
Correct answer: 5 : 2