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Brief Questions and Answers (3 marks each)
Q.1 What is meant by parallel forces?
Q.2 What is meant by like parallel forces? Also give examples.
Q.3 What are unlike parallel forces? Also give examples.
Q.4 Define head to tail rule.
Q.5 Define resolution of vectors.
Q.6 Define torque or moment of force.
Q.7 Define centre of mass.
Q.8 Define centre of gravity.
Q.9 Define couple and give examples.
Q.10 Define equilibrium.
Q.11 State conditions of equilibrium.
Q.12 Define stable equilibrium.
Q.13 Define unstable equilibrium.
Q.14 Define neutral equilibrium.
Q.15 Define rigid body and axis of rotation.
Q.16 What is meant by the principle of moments?
Q.17 How is the stability of a body related to the position of its centre of mass?
Q.18 Differentiate between axis of rotation and point of rotation.
Q.19 On what factors does rotation produced in a body depend?
Q.20 How can we increase torque by keeping the force constant?
Q.21 Can a moving body be in equilibrium? Explain.
Q.22 Will a body be in equilibrium under the action of a single force?
Q.23 Can a body be in equilibrium if it is revolving clockwise under the action of a single force?
Q.24 Give an example of a case when the resultant force is zero but resultant torque is not zero.
Q.25 How do we know whether a body is in stable or unstable equilibrium due to the position of its centre of gravity?