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ICSE Notes 2017 : Physics (De Paul School, Berhampur)

12 pages, 215 questions, 188 questions with responses, 310 total responses,    1    0
Ashutosh Rath
De Paul School, Berhampur
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LAST MINUTE PACKAGE :- ICSE - X TIWARI TUTORIALS DATE : 11 MARCH Memorise and write all formulae and basic concepts FORCE 1. Momentum = mass velocity ; p = mv 2. Force = mass acceleration ; F = ma 3. Impulse = Force (large) time (small) = F t 4. Change in momentum = mass change in velocity; p = m v 5. The force due to gravity ; F = mg 6. Equations of motion v = u + at (ii) 1 1 s (u v) t ut at 2 2 2 2 (iii) v = u + 2 as Relationship between newton and dyne : 1 N = 105 dynes 9. Kilogramme-force (kgf) : 10. Moment of force = Force Perpendicular distance of the line of action of force from axis of rotation; = F d 11. Moment of couple = either force perpendicular distance between the two forces; = F d 12. In equilibrium position, According to principle of moment : Sum of anticlockwise = Sum of clockwise moments moments. 1 kgf = 9.8 N WORK, POWER & ENERGY - 1. Work = Force Displacement of the point of application of the force in the directioin of force; W = F d cos 2. Relationship between Joule and Erg : 1 J = 107 ergs. 3. Bigger units of work : 1 kilo joule (k.j.) = 103 J ; 1 Mega joule (M.J.) = 106 J ; 1 giga-joule = 109 J 4. Bigger units of power : (a) 1 Kilowatt (K.W.) = 103 W ; (b) 1 Mega watt (M.W.) = 106 W ; (c) 1 Giga watt (G.W.) = 109 W ; (d) 1 Horse power (H.P.) = 746 W 5. Work done by the force of gravity; W = mgh 6. Power = Time taken ; P = t Work done TIWARI TUTORIALS Relationship between Power, Force and Velocity Power = Force Velocity; P = F v W Gomti Nagar : 0522-4043177 Indira Nagar : 0522-4043277 1 1 (mass) (velocity)2 = mv2 2 2 8. Kinetic energy = 9. Potential energy = (mass) (acceleration due to gravity) (height) ; P.E. = mgh 10. By the law of conservation of energy : P.E. = K.E. 1 mv2 2 mgh = 2gh = v2 11. Relationship between kinetic energy K and Momentum p p 2 m K or K p 2 / 2 m 12. According to Work energy theorem, work done = change in kinetic energy 1gf = 980 dynes T IWARI TUTORIALS Gramme-force (gf) : T IWARI TUTORIALS 8. T IWARI TUTORIALS 7. TIWARI TUTORIALS 2 T IWARI TUTORIALS (i) T IWARI TUTORIALS 4 7 PM : FORCE, WORK POWER AND ENERGY T IWARI TUTORIALS We hope your today s paper would be excellent. 1:30 - 4:00 PM - relax lunch and sleep. 7. TIWARI TUTORIALS W 1 1 mv f 2 mvi 2 2 2 IF TIME IS LEFT REVISE ALL THE SOLVED EXAMPLES OF TEXT BOOK NOW DO THE FOLLOWING QUESTIONS FORCE Q.1. What is the weight of a body placed at the centre of the earth? Q.2. Give any two effects of a force on a non-rigid body. Q.3. One end of a spring is kept fixed while the other end is stretched by a force as shown in the diagram. F (i) (ii) Fixed end Copy the diagram and mark on it the direction of the restoring force. Name one instrument which works on the above principle. Q.4. The position of the centre of gravity of a body remains unchanged even when the body is deformed. State whether the statement is true or false. Q.5. With reference to their direction of action, how does Aliganj : 0522-4043477 Aashiyana : 0522-4041077 1

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