A child with a mass of 23 kg is sliding at a constant velocity down a slide inclined at 50°. What is the coefficient of kinetic friction (uk) between the child and the slide? This ball is rolling down a ramp inclined at an angle of 20°. It has a mass of 5kg. The coefficient of kinetic friction is 0.25. What is the acceleration of the ball?

Q: am designing a ramp to slide boxes down. The angle of the ramp is 35º. A plastic box massing 30 kg…

A: angle of friction          tanθ=μ if  μ > μs=k  then no slide  μ < μs=k   slide

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