Question

1). Near the earth surface, acceleration due to gravity is 9.8 m/s a) True b) False c) Can's say 2). The force exerted normal to the surface is called "normal force" a) False b) True c) Statement is wrong 3). The normal force Fn acting on a horizontally place object of mass 10 kg is (assume at rest) a) 98 N b) 90 N c) 49 N d) 50 N 4). An object of mass 'm' is accelerated vertically upward by applying a pull force F, which of the following is correct (consider the linear acceleration 'a'): a) Fp-mg=ma b) Fp-mga-ma c) Fr=mg d) Fr=0 5). Weight loss phenomena in an accelerated elevator can be observed when the elevator? a) Descends b) Ascends c) Unknown 6). Coefficient of friction during the motion of an object is known as a) Static friction b) Kinetic friction c) mono-static friction 7). Write down the relation for coefficient of friction u when the given frictional force is F, and the normal force is Fx 8). Frictional force is microscopic properties of two contact surfaces a) True b) False c) Can't say 9). If the coefficient of static friction is greater than the coefficient of kinetic friction then the object remains at rest. a) True b) False c) Incomplete statement 10). Compare the coefficient of static friction for 'wood-on-wood' and 'ice-on-ice'. Write in terms of greater sign > or smaller sign

Answer 1

Solution 0 due to Near the Earth surface, acceleration granity is 9,8 m/82 @ TRUE is CORRECT is @ The force exerted normal to surface called normal force. IN IN Inclined surface Horizontal sarfee @ TRUE is CORRECT IN m TE Here malokg 9. 9-9-8 m/82 ng Normal force = mg - N=10x9.6 IN=96 Newton 96 N is CORRECT @

ma I 1 to pull force. mg S' Upward forces gris clear that Fp+mazing 18 balanced by 3 [FP - mg = -ma mg} CORRECT. 6 Fping =-ma is © Weight loss phenomenon in an accelerated elevates can be observed when the elevater Descends. It is due to increase in downward accteration Descends @ the motion of friction, 6 Coefficient of friction during Object is known as Kinetic 6 kinetic friction