Some examples from this set of practice questions
1.
Give quantitative definition of torque.
Answer: - Torque (moment of force) is equal to product of magnitude of force and perpendicular distance between fixed point and point of application of force (is also called as couple arm). Unit of moment of force- - SI unit = Nm = dynecm
2.
State the factors affecting the turning effect of force.
Answer: The factors are--- - Magnitude force and the perpendicular distance between the fixed point of application of force. - Moment of force is directly proportional to the perpendicular distance.
3.
State two conditions for a body to be equilibrium.
Answer: The conditions are--- - The resultant of all forces acting on the body is zero. - The resultant of moment of force acting at the point of rotation is zero
4.
Mention the two types of equilibrium.
Answer: (i) Static equilibrium- when a body remains in the same state of rest under the influence of several forces. Ex:- A book lying on the table. (ii) Dynamic equilibrium- when a body remains in the same state of motion under the influence of several forces. Ex:- A raindrop reaches earth at a constant velocity
5.
State the principle of moments.
Answer: In equilibrium sum of anticlockwise momentum = sum of all clockwise moments. Ex:- Beam balance and See-Saw.
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