Question:
A body is projected at an angle $ \alpha $ from a point O. Its angular momentum will be zero at:
A body is projected at an angle $ \alpha $ from a point O. Its angular momentum will be zero at:
Updated On: Jun 7, 2022
- the point where it touches ground
- another point on trajectory
- starting point
- at the maximum height
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The Correct Option is C
Solution and Explanation
The relation for angular momentum is $ ={{r}_{p}}\sin \alpha . $ The required conditions for angular momentum to be zero, is only $ r $ to be zero because momentum p can never be zero and also projected angle a can never be zero while the body is in projectile path.
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Concepts Used:
Rotational Motion
Rotational motion can be defined as the motion of an object around a circular path, in a fixed orbit.
Rotational Motion Examples:
The wheel or rotor of a motor, which appears in rotation motion problems, is a common example of the rotational motion of a rigid body.
Other examples:
- Moving by Bus
- Sailing of Boat
- Dog walking
- A person shaking the plant.
- A stone falls straight at the surface of the earth.
- Movement of a coin over a carrom board
Types of Motion involving Rotation:
- Rotation about a fixed axis (Pure rotation)
- Rotation about an axis of rotation (Combined translational and rotational motion)
- Rotation about an axis in the rotation (rotating axis)