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Kinetic Friction

33/ A block i...

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33/ A block is projected with speed 20 m/s on a roughhorizontal surface. The coefficient of friction (u)between the surfaces varies with time () as showin figure. The speed of body at the end of 4 secondwill be (g = 10 m/s2)0.50.3ts)2(1) 2 m/s(2) 5 m/s(3) 7.2 m/s(4) 9.5 m/s

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Q. A block is projected with speed

20 m / s

on a rough horizontal surface. The coefficient of friction

(μ)

between the surfaces varies with time

(t)

as shown in figure. The speed of body at the end of

4

(g = 10 m / s^{2})

.

20

kg block is originally at rest on a horizontal surface for which the coefficient of friction is

0.6

. If a horizontal force F is applied such that it varies with time as shown in figure. Determine speed of block at

10

Q. A small body is projected with a velocity of

20.5 {ms}^{- 1}

on a rough horizontal surface. The coefficient of friction

(μ)

between the surface changes with time (

t

s

) as the body moves along the surface. The velocity at the end of

4 s

{ms}^{- 1}

. (take $g = 10 {ms}^{- 2}$ )

Q. A small body is projected with a velocity of

20.5 {ms}^{- 1}

on a rough horizontal surface. The coefficient of friction

(μ)

between the surface changes with time (

t

s

) as the body moves along the surface. The velocity at the end of

4 s

{ms}^{- 1}

. (take $g = 10 {ms}^{- 2}$ )

Q. A block of mass 1 kg is moving at

t = 0

with speed 2 m/s on rough horizontal surface with coefficient of friction 0.2. A horizontal force F is applied in the same direction of velocity which varies with time as shown in figure(b). Find the speed of block at

t = 3 s

(g = 10 m / s^{2})

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