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The box is stationary on the inclined surface. The coefficient of static friction between the box and the surface is μs. (a) If the mass of the box is 10 kg, α = 20∘, β = 30∘ and μs = 0.24, what force T is necessary to start the box sliding up the surface? (b) Show that the force T necessary to start the box sliding up the surface is minimum when tan⁡β = μs.

The box is stationary on the inclined surface. The coefficient of static friction between the box and the surface is μs. (a) If the mass of the box is 10 kg, α = 20∘, β = 30∘ and μs = 0.24, what force T is necessary to start the box sliding up the surface? (b) Show that the force T necessary to start the box sliding up the surface is minimum when tan⁡β = μs.

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The box is stationary on the inclined surface. The coefficient of static friction between the box and the surface is μ s . (a) If the mass of the box is 10 k g , α = 20 ∘ , β = 30 ∘ and μ s = 0.24 , what force T is necessary to start the box sliding up the surface? (b) Show that the force T necessary to start the box sliding up the surface is minimum when tan ⁡ β = μ s .

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