Physics Laws of Motion Exercise3c
Please Select
Q1 Name the two factors on which the force needed to stop a moving body in a given time, depends.
Q2 Define linear momentum and state its S.I. unit.
Q3 A body of mass m moving with a velocity v is acted upon by a force. Write expression for change in momentum in each of the following cases: (i) when v << c, (ii) when vc, and (iii) when v<< c but m does not remain constant. Here c is the speed of light.
Q4 Show that the rate of change of momentum = mass x acceleration. Under what condition does this relation hold?
Q5 Two bodies A and B of same mass are moving with velocities v and 2v respectively. Compare their (i) inertia (ii) momentum.
Q6 Two balls A and B of masses m and 2m are in motion with velocities 2v and v respectively. Compare (i) their inertia, (ii) their momentum, and (iii) the force needed to stop them in same time.
Q7 State Newton’s second law of motion. What information do you get from it?
Q8 How does Newton’s second law of motion differ from first law of motion?
Q9 Write the mathematical form of Newton’s second law of motion. State condition if any.
Q10 State Newton’s second law of motion. Under what condition does it take the form F=ma?
Q11 . How can Newton’s first law of motion be obtained from the second law of motion?
Q12 Draw graphs to show the dependence of (i) acceleration on force for a constant mass, and (ii) force on mass for a constant acceleration.
Q13 How does the acceleration produced by a given force depend on mass of the body? Draw a graph to show it.
Q14 Name the S.I. unit of force and define it
Q15 What is the C.G.S unit of force? How is it defined?
Q16 Name the S.I. and C.G.S units of force. How are they related?
Q17 . Why does a glass vessel break when it falls on a hard floor, but it does not break when it falls on a carpet?
Q18 Use Newton’s second law of motion to explain the following:
(a) A cricketer pulls his hands back while catching a fast moving cricket ball.
(b) An athlete prefers to land on sand instead of hard floor while taking a high jump.
Multiple Choice type Questions :
Q1 The linear momentum of a body of mass m moving with velocity v is:
(a) v/m
(b) m/v
(c) mv
(d) 1/mv
Q2 The unit of linear momentum is:
(a) Ns
(b) kg ms-2
(c) Ns-1
(d) kg2 ms-1
Q3 The correct form of Newton’s second law is:
(a)F = Δp/ Δt
(b) F=m Δv/ Δt
(c) F = v (Δm/ Δt)
(d) F = mv
Q4 The acceleration produced in a body by a force of given magnitude depends on
(c) Size of the body
(d) Shape of the body
(e) Mass of the body
(f) None of these
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