A level Uniform Circular Motion Quiz 1

16 Questions

Quiz Description

A level Uniform Circular motion Quiz. In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path. It can be uniform, with constant angular rate of rotation and constant speed, or non-uniform with a changing rate of rotation. The rotation around a fixed axis of a three-dimensional body involves circular motion of its parts. The equations of motion describe the movement of the center of mass of a body.

Examples of circular motion include: an artificial satellite orbiting the Earth at a constant height, a ceiling fan's blades rotating around a hub, a stone which is tied to a rope and is being swung in circles, a car turning through a curve in a race track, an electron moving perpendicular to a uniform magnetic field, and a gear turning inside a mechanism.

Since the object's velocity vector is constantly changing direction, the moving object is undergoing acceleration by a centripetal force in the direction of the center of rotation. Without this acceleration, the object would move in a straight line, according to Newton's laws of motion.

1:

A cyclist turns around a curve at 15 miles/hour. If he turns at double the speed, the tendency to overturn is


Correct
  • 1:
    Doubled
  • 2:
    Quadrupled
  • 3:
    Halved
  • 4:
    Unchanged
2:

The angular velocity of a body moving with a constant speed v in a circle of radius r is given by 


Correct
  • 1:
    v^2 /r
  • 2:
    vr
  • 3:
    v/r
  • 4:
    r/v
3:

 What will be the velocity vector of a particle moving in a circle describing equal angles in equal times


Correct
  • 1:
    Changes in direction
  • 2:
    Remains constant
  • 3:
    Changes in magnitude
  • 4:
    Changes both in direction and magnitude
4:

A body moves with a constant speed in a circular path is moving in a circular path with a constant speed. It has


Correct
  • 1:
    Acceleration of constant magnitude
  • 2:
    Constant velocity
  • 3:
    Constant acceleration
  • 4:
    An acceleration which varies with time
5:

A motorcyclist going with a constant speed in a circular track has


Correct
  • 1:
    Linear velocity is constant
  • 2:
    Constant acceleration
  • 3:
    Angular velocity is constant
  • 4:
    Constant force
6:

What could be the reason a car moving on a horizontal road gets thrown out of the road while taking a turn


Correct
  • 1:
    Due to the reaction of the ground
  • 2:
    Due to rolling frictional force between tyre and road
  • 3:
    By the gravitational force
  • 4:
    Due to lack of sufficient centripetal force
7:

If a particle moves with constant angular velocity in a circle then during the motion its


Correct
  • 1:
    Momentum is conserved
  • 2:
    Energy is conserved
  • 3:
    Both energy and momentum is conserved
  • 4:
    None of the above is conserved
8:

A stone tied to a string is rotated in a circle. If the string is cut, the stone flies away from the circle because


Correct
  • 1:
    A centrifugal force acts on the stone
  • 2:
    Of its inertia
  • 3:
    A centripetal force acts on the stone
  • 4:
    The reaction of the centripetal force
9:

A body moves with a constant speed along a circle. Then,


Correct
  • 1:
    No work is done on it
  • 2:
    There is no acceleration produced in the body
  • 3:
    No force acts on the body
  • 4:
    The body has constant velocity
10:

A tachometer is a device to measure


Correct
  • 1:
    Gravitational pull
  • 2:
    Speed of rotation
  • 3:
    Surface tension
  • 4:
    Tension in a spring
11:

A fighter aeroplane flying in the sky dives with a speed of 360 km/hr in a vertical circle of radius 200 m. Weight of the pilot sitting in it is 75 kg. What will be the value of force with which the pilot presses his seat when the aeroplane is at highest position (g = 10 m/s^2)


Correct
  • 1:
    3000 N
  • 2:
    1500 N
  • 3:
    (75 × g)N
  • 4:
    300 N
12:

A frictional track ABCDE ends in a circular loop of radius R, body slides down the track from point A which is at a height h of 5 cm. Maximum value of R for the body to successfully complete the loop is:


Correct
  • 1:
    5 cm
  • 2:
    15/4 cm
  • 3:
    10/3 cm
  • 4:
    2 cm
13:

A cyclist is moving in a circular track of radius 80 m, with a velocity of 36 km/hour. In order to keep his balance, he has to lean inwards from the vertical through an angle q. If g = 10 m/s2, then q is given by


Correct
  • 1:
    arctan(2)
  • 2:
    arctan(4)
  • 3:
    arctan(1/4)
  • 4:
    arctan(1/8)
14:

A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?


Correct
  • 1:
    2 cm
  • 2:
    4 cm
  • 3:
    6 cm
  • 4:
    16 cm
15:

A car sometimes overturns while taking a turn. When it overturns, it is


Correct
  • 1:
    the inner wheel which leaves the ground first
  • 2:
    the outer wheel which leaves the ground first
  • 3:
    both the wheel leave the ground simultaneously
  • 4:
    either inner wheel or the outer wheel leaves the ground
16:

A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is


Correct
  • 1:
    7 m/s
  • 2:
    14 m/s
  • 3:
    8 m/s
  • 4:
    12 m/s

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A level Uniform Circular Motion Quiz 1
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