Circular motion refers to the movement of an object along a circular path, where forces like centripetal force keep it in motion. It is key in understanding the dynamics of rotating systems and orbits.
Physics Class 11 Chapter 5 Notes
A satellite moving around the earth constitutes: non inertial frame of reference
The close orbiting satellite orbit the Earth at height of about: 3.9 × 10’5 m
The mass of the satellite is unimportant in describing the: satellite‟s orbit
A man weighs 1000 N is in a stationary lift. What will be it‟s weight if the lift starts moving up with an acceleration 10 m/s2: 2000 N
When the lift is at rest, Newton‟s second law tells us that acceleration is: zero
Generally, the weight of an object is measured by a: spring balance
The system in which no force is required to hold an object falling in the frame of reference of the space craft or satellite is called: gravity free system
The spaceship accelerates: towards the center of the earth
The apparent weight of the body in spaceship in orbiting the earth is: weightlessness
When the elevator moving down with an acceleration of 9.8ms-2 then the weight of a person becomes: zero
The weight of an object at the poles of the earth as compared to equator of earth: larger
An elevator is moving upward with acceleration „a‟ the apparent weight of an object inside the elevator is: mg + ma
A man in an elevator descending with acceleration will conclude that his weight has: decreased
Apparent weight of a man in upward accelerated lift will: increase
A mass of 1 kg is free falling. The force of gravity is: 9.8 N
As we go from pole to equator of earth, the value of “g”: decreases
Weight of a body at the center of Earth is: zero
Apparent weight of a body in the inertial frame is: real weight
If no energy is lost against friction, then rotational K.E of the disc or hoop on reaching the bottom of inclined plane must be: equal to P.E at top
The rotational K.E of disc is _ of translational K.E: 1/2 times
A hoop of radius 1m and mass 2kg rolls down an inclined plane of height 10m its speed on reaching the ground is: 10m/sec
The ratio of rotational K.E of hoop to its translational K.E is: 1:1
The rotational K.E of any hoop of radius r is given by: 1/2 Iω2
The direction of angular momentum along the axis of rotation: remain fixed
Earth moves around the sun according to: law of conservation of angular momentum
When we drop ink into beaker in a coasting rotating system then it angular velocity: decreases
The axis of rotation of an object will not change its orientation unless an _ causes it to do so: external torque
The diver spins faster when moment of inertia becomes: smaller
Law of conservation of angular momentum states that if no __ acts on a system, the total angular momentum of the system remain constant: external torque
The angular momentum associated with the motion of a body along a circular path is called: orbital angular momentum
The angular momentum of anybody about a fixed point is conserved when the angular acceleration of the body: must remain constant
Which of the following is a vector quantity: angular momentum
The direction of angular momentum is: along the axis of rotation
The magnitude of angular momentum is given by: L = mvr
The rate of change of angular momentum of a body is equal to: the applied torque
If External Torque on a body is zero, then which of these quantities is constant: Angular Momentum
Angular momentum of a body under a centripetal force is: constant
Moment of inertia is rotational counter part of: mass
If two cylinders of equal mass roles, the one with the larger diameter has the: larger rotational inertia
The moment of inertia of a body comes in action in: circular path
The unit of moment of inertia is: kgm2
In rotational motion analogous of force is: torque
Moment of Inertia is equal to: I = mr2
Tangential and centripetal accelerations are always: perpendicular to each other
The centripetal acceleration directed along the radius: towards the centre of the circle
The centripetal force has the same dimension as the: centrifugal force
The curved flight of fighter planes at high speed requires a large: centripetal force
If the radius of the circular path of a moving body is half without changing speed of rotation then the FC becomes: b
A car of mass 1000kg traveling at 40 ms-1 rounds a curve of radius 100m. what is the FC: 1.6 × 10’4N
The necessary centripetal force to the moving car round a corner track is provided by: frictional force
A body is rotated in a vertical circle by a string. The tension in the string is maximum at the: bottom
A body is rotated in a vertical circle by a string. The tension in the string is minimum at the: top
The force which provides the necessary centripetal force to keep the mud in circular path is called: adhesive force
The mud flies off the tyre of a fast moving car in the direction: centripetal force
Rotational counter part of force is: torque
The force required to bend the normally straight path into a circular path is called: centripetal force
If a body revolves under centripetal force, its angular acceleration is: non zero
Centripetal force performs: no work
Centripetal force is directed along: Tangent to circle
The centripetal acceleration is also called: radial
When a body is whirled in a horizontal circle by means of a string, the centripetal force is supplied by: tension in the string
The direction of centripetal force is: along the axis of rotation
The direction of motion changes continuously in: circular motion
The linear velocity in circular path is also called: angular velocity
When the axis of rotation is fixed then all the angular vectors have: same direction
If a car moves with uniform speed of 2m/s in a circle of radius 0.4 m. It‟s angular speed is: 5 rad/s
The acceleration of a motor car is 8 m/s2 . If the diameter of its wheel be 2m. It‟s angular acceleration will be: 8 rad/s2
The angle between angular velocity and angular acceleration when angular velocity decreases is: 90o
When a body is in circular motion the angle between linear and angular velocity is: 90°
Choose the quantity which plays the same role in angular motion as that of mass in linear motion: moment of inertia
The angular acceleration is produced due to: Torque
Angular acceleration is expressed in units of: rad s-2
The direction of angular acceleration is: along the axis of rotation
Direction of angular acceleration is always along: the axis of rotation
The rate of change of angular velocity is called: angular acceleration
The direction of angular acceleration is same as that of _ while velocity is increasing: tangential acceleration
If a rotating body is moving counter clockwise, direction of angular velocity will be: perpendicular to both radius and linear velocity
The angular speed of fly wheel making 120 revolutions per minutes is: 4π rad/s
The direction of angular velocity of a body moving in a circle is: along the axis of rotation
For a particle moving in a horizontal circle with constant angular velocity: the energy is constant but the linear momentum varies
A body starting from rest attains angular acceleration of 5 rad s–2 in 2 second. Final angular velocity will be: 10 rad s–1
The time rate of change of angular displacement is called:Angular velocity
If a car moves with a uniform speed of 2m/sec. in a circle of radius 0.4 m its angular speed is: 5rad/sec
Revolution per minute is unit for: angular velocity
A Wheel of radius 50 Cm having an angular speed of 5 red S-1 have linear speed: 2.5mS-1
When a body moves in a circle, the angle between its linear velocity „v‟ and angular velocity „ω‟ is always: 90o
A satellite orbiting around the earth is an example of: circular motion
Radian is defined as the angle subtended at the center of a circle by an: arc whose length is equal to the radius of circle
The S.I unit of angular displacement: radian
The direction of angular displacement along the axis of rotation is given by: right hand rule
For positive angular displacement the rotation would be: anti-clockwise
For a small θ, angular displacement is quantity: vector
A wheel of radius 2 m turns through an angle of 57.3°, it lays out a tangential distance of: 2 m
A wheel of diameter 1 m makes 60 rev/min. The linear speed of a point on its rim in ms–1 is: π
The angle subtended at the centre by circumference of a circle is: 2π rad
2° is equal to: 0.035 rad
The angle subtended by one complete circle at its center in radians is: 2π
2 revolutions are equal to: 4π rad
Solid angle subtended at centre by a sphere is: 4π
2 radian = ——: 114.6°
A wheel of radius 2 m turns through an angle of 57.3°. It lays out a tangential distance: 2m
One radian is equal to: 57.3o
When object moves in a circular path, then its direction is: continuously changing
Important : Review all previous years’ 11 Class Past Papers for comprehensive practice and better exam preparation.