Basic Physics

# Rolling motion – problems and solutions

1. A hollow cylindrical object (I = m R2) moves to roll without slipping up a rough inclined plane with an initial velocity of 10 m/s. The inclined plane has an elevation angle θ with tan θ = 0.75. If the gravitational acceleration g = 10 m.s-2, the velocity of the object is reduced to 5 m.s-1 then the distance on the inclined plane of the object is…

Known :

Moment of inertia of the hollow cylinder (I) = m R2

Elevation angle = θ , where tan θ = 0.75 = 75/100 = opp / adj

Sin θ = opp / hyp = 75/125 = 3/5 = 0.6

Acceleration due to gravity (g) = 10 m/s2

Initial velocity (vo) = 10 m/s

Final velocity (vt) = 5 m/s

Wanted : Distance Solution :

Calculate the height reached by the cylinder using equation of the conservation of mechanical energy. Initial height (ho) = 0 meter

Initial velocity (vo) = 10 m/s

Final velocity (vt) = 5 m/s

Acceleration due to gravity (g) = 10 m/s2 The cylinder reaches a height of 7.5 meters.

Distance traveled by cylinder : Distance traveled by the cylinder is 12.5 meters.

Description of the equation :

o = initial, t = final, ME = mechanical energy, PE = potential energy, KE = kinetic energy, m = mass, g = acceleration due to gravity, h = height, v = linear velocity, ω = angular velocity, I = moment of inertia, R = radius of cylinder

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2. A solid cylinder (I = ½ m R2) with a mass of 3 kg moves to roll without slipping up a rough inclined plane having an elevation angle θ with sin θ = 0.6. If the gravitational acceleration g = 10 m.s-2 and the initial velocity of the object is 10 m/s, then the length of the inclined plane traveled by an object is…

Known :

Moment of inertia of solid cylinder (I) = ½ m R2

Mass of cylinder = 3 kg

Initial velocity (vo) = 10 m/s

Final velocity (vt) = 0 m/s (object stop)

Elevation angle (θ) = θ, where sin θ = 0.6 = 6/10 = opp/hyp

Acceleration due to gravity (g) = 10 m/s2 Wanted : The length of the inclined plane traveled by object

Solution :

Calculate the height reached by the cylinder using equation of the conservation of mechanical energy.  Initial height (ho) = 0 meter

Initial velocity (vo) = 10 m/s

Final velocity (vt) = 0 m/s (object stop)

Acceleration due to gravity (g) = 10 m/s2 The cylinder reaches a height of 7.5 meters.

Distance traveled by cylinder : Distance traveled by the cylinder is 12.5 meters.

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3. A hollow cylindrical object (I = m R2) with radius R, moves to roll without slipping up a rough inclined plane with an angle of α where sin α = 0.8. If the gravitational acceleration g = 10 m.s-2 and the initial velocity is 8 m.s-1 then the length of the inclined plane reached by the object before it stops is…

Known :

Moment of inertia of solid cylinder (I) = m R2

Initial velocity (vo) = 8 m/s

Final velocity (vt) = 0 m/s (object stop)

Elevation angle of inclined plane (θ) = θ, where sin θ = 0.8

Acceleration due to gravity (g) = 10 m/s2

Wanted : Distance traveled by cylinder

Solution :

Calculate the height reached by the cylinder using equation of the conservation of mechanical energy.  Initial height (ho) = 0 meter

Initial velocity (vo) = 8 m/s

Final velocity (vt) = 0 m/s

Acceleration due to gravity (g) = 10 m/s2 The cylinder reaches a height of 6.4 meters.

Distance traveled by cylinder : Distance traveled by the cylinder is 8 meters.

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