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Brief Questions and Answers Physics (3 marks each)
Q.1 Define dynamics.
Q.2 Define force.
Q.3 Define inertia.
Q.4 What is momentum?
Q.5 State Newton's First law of motion.
Q.6 Why Newton's First law of motion is also called law of inertia?
Q.7 State Newton's Second law of motion.
Q.8 What is the unit of force? Define it.
Q.9 State Newton's Third law of motion.
Q.10 If a moving body has no acceleration; does it mean that no force is acting on it?
Q.11 What do you know about Momentum?
Q.12 Prove that 1 kg·m/s = 1 Ns.
Q.13 On which quantities does Momentum (quantity of motion) of a body depend?
Q.14 What is the relationship between momentum and the force applied on the body?
Q.15 State the law of conservation of momentum.
Q.16 Write down the advantages and disadvantages of friction.
Q.17 Can balanced forces move a body?
Q.18 How can we reduce friction?
Q.19 What is friction?
Q.20 Define coefficient of friction.
Q.21 Explain the terms normal reaction and limiting friction.
Q.22 What is meant by Resultant force?
Q.23 Why an object moves in the direction of the net force?
Q.24 What is frictional force?
Q.25 Why do we use lubricants in machines?
Q.26 What is the unit of coefficient of friction?
Q.27 What is air resistance?
Q.28 State Newton's First Law of Motion in terms of momentum.
Q.29 How is impulse related to momentum?
Q.30 What is the relationship between the mass and inertia of an object?
Q.31 How does the angle of inclination affect the force of friction?
Q.32 What is the role of friction in walking?