Question

Exercises
Short-Answer Questions
1. What characterises rotational motion?
2. How is the moment of a force defined?
3. Write the SI unit of the moment of force.
4. What are positive and negative moments?
2.
5. What is thrust?
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6. Define pressure and write its SI unit.
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Answer 1

1.What characterises rotational motion?

Ans:-Rotational motion can be defined as a motion of an object around a circular path, in a fixed orbit. ... It is also called the rotational inertia. Angular momentum: It is a product of angular velocity and the moment of inertia, which determines the quantity of rotation of the body.

2. How is the moment of a force defined?

Ans:-The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis. ... A moment is due to a force not having an equal and opposite force directly along it's line of action.

3. Write the SI unit of the moment of force.

Ans:-S.I unit of moment of force is Newton meters (N m).

4. What are positive and negative moments?

Ans:-Following our positive beam sign convention, a positive bending moment bends a beam concave upward (or towards the positive y direction), whereas a negative bending moment bends a beam concave downward (or towards the negative y direction).

5. What is thrust?

Ans:-Force exerted by an object perpendicular to the surface is called thrust. Pressure : Force exerted by any object per unit area is called pressure. ∴Pressure=ForceArea. Or, Pressure=ThrustArea.

6. Define pressure and write its SI unit.

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Ans:-Pressure is defined as force applied per unit area. Its unit in SI system is Newton per meter square (or) Pascal.

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Answer 2

this is your all answer ok