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STATEMENT -1 : Friction always opposes m...

STATEMENT -1 : Friction always opposes motion .
STATEMENT - 2 : Lesser the friction on a surface it is easier to walk on it.
STATEMENT -3 : Soles of shoes gets flat due to friction .

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Does friction always oppose the motion?

Consider a block ( of mass m) shown in the figure , placed on a rough hemisphere of radius R. The hemisphere is moving horizontally with spped 2 m/s. Height of the block - from ground is constant . STATEMENT -1 : Force of friction on the block is mg . STATEMENT -2 : Force of friction on the block is kinetic in nature . STATEMENT - 3 : Net force on the block is zero.

STATEMENT - 1 : If an object is at rest then there should not be any friction on it . STATEMENT - 2: If an object is moving then the friction acting on it has to be kinetic . STATEMENT -3 : If an object is at rest then kinetic friction cannot act on it.

STATEMENT -1 : Force of friction depends on the actual area of contact . STATEMENT -2 : Centripetal and centrifugal forces always cancel each other . STATEMENT - 3 : A horse cannot run a cart in empty space.

STATEMENT-1 : A resistor opposes the flow of current . and STATEMENT-2 : An inductor opposes change in strength of current.

STATEMENT-1: Potential energy has a minimum at the position of stable equilibrium. STATEMENT-2: Mechanical energy of a system is always positive STATEMENT 3-: Work done by the friction may be positive identify the correct combination of true (T) and false (F) of the given three statements

STATEMENT -1 : Acceleration due to gravity is maximum at poles. and STATEMENT -2 : There is no effect of rotational motion of earth on gravity at poles.

STATEMENT-1 : An oscillatory motion is necessarily periodic. and STATEMENT -2 : A simple harmonic motion is necessarily osciallatory.

STATEMENT-1 : Magnetic fluex linked with a closed surface is always zero . and STATEMENT-2 : Magnetic field can exist without North and South poles .

STATEEMNT-1 : Work done by frictional force is always either negative or zero. because STATEMENT-2 : Work done by the static friction on a system may be zero.

AAKASH INSTITUTE ENGLISH-LAWS OF MOTION-TRY YOURSELF
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