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Zo 14. (a) Mass = }-§)—;6— = l0·”° kg. -15 (b) Vertical acceleration= = = 1-8 >< 101” m / sz. Since there is no horizontal force, its horizontal velocity would remain constant. (Newton I) 15. Force on 2 kg mass=2 >< 9·8= 19-6 N or 2 kgf. Force on 5 kg mass=5 >< 9·8=49·0 N or 5 kgf. Force on m kg mass=m >< 9-8 N =m kgf. 16. Yes. 17. The Earth is Hattened at the poles and hence the falling body is nearer the Earth’s centre at the poles and its weight is greater. The Earth spins. Therefore a body at the Equator is describing a circle equal to the Earth’s radius.

It is a momentum reaction. (f) False. It increases maybe the force you can exert, but any benefit of force is lost in the reduction of the distance moved. (g) True. More mass would be required to stretch the spring since the gravitational field is reduced. (h) False. But very seldom does a force act without producing some kind of distortion, using up energy. (i) False. Air resistance acts differently on different bodies. The distance from the centre of attraction affects the motion. —4 42 PHYSICS IS FUN TEAcHERs’ GUIDE 66.

Therefore its velocity is constant. (b) Newton’s first law implies that no unbalanced force acts on it. 22 PHYSICS IS FUN TEACHERS° GUIDE 11. The pistons in a reciprocating engine reverse their direction of motion frequently. Hence their velocity must change rapidly. Hence there is a large acceleration. An unbalanced force is needed (to produce this acceleration) which is proportional to the mass. The mass is kept as low as is possible to reduce this force, which must be applied to the piston by the connecting rod acting through its bearing in the piston.

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