A solid sphere of radius R rolls without slipping down an incline of height h. W

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Question: A solid sphere of radius R rolls without slipping down an incline of height h. What is its speed at the bottom of the incline? (2021)

Options:

√(2gh)
√(3gh)
√(4gh)
√(5gh)

Correct Answer: √(3gh)

Solution:

Using conservation of energy, potential energy at the top = kinetic energy at the bottom. For a solid sphere, v = √(5gh/7). Thus, speed at the bottom is √(3gh).

A solid sphere of radius R rolls without slipping down an incline of height h. W

Practice Questions

A solid sphere of radius R rolls without slipping down an incline of height h. What is its speed at the bottom of the incline? (2021)

√(2gh)
√(3gh)
√(4gh)
√(5gh)

Questions & Step-by-Step Solutions

A solid sphere of radius R rolls without slipping down an incline of height h. What is its speed at the bottom of the incline? (2021)

Step 1: Understand that the sphere starts at a height 'h' and has potential energy due to its height.
Step 2: Recognize that as the sphere rolls down, this potential energy converts into kinetic energy.
Step 3: Remember that the total kinetic energy of a rolling object includes both translational (movement) and rotational (spinning) energy.
Step 4: Write the equation for potential energy at the top: PE = mgh, where m is mass and g is acceleration due to gravity.
Step 5: Write the equation for kinetic energy at the bottom: KE = (1/2)mv^2 + (1/2)Iω^2, where I is the moment of inertia and ω is the angular velocity.
Step 6: For a solid sphere, the moment of inertia I = (2/5)mR^2 and the relationship between linear speed v and angular speed ω is ω = v/R.
Step 7: Substitute I and ω into the kinetic energy equation to get KE = (1/2)mv^2 + (1/2)(2/5)mR^2(v/R)^2.
Step 8: Simplify the kinetic energy equation to combine terms and express it in terms of v.
Step 9: Set the potential energy equal to the total kinetic energy: mgh = (1/2)mv^2 + (1/5)mv^2.
Step 10: Solve for v to find the speed at the bottom of the incline: v = √(5gh/7).

Conservation of Energy – The principle that the total energy in a closed system remains constant, allowing potential energy to convert into kinetic energy.
Rolling Motion – Understanding the dynamics of objects that roll, including the relationship between translational and rotational kinetic energy.
Moment of Inertia – The distribution of mass in an object affects its rotational motion, which is crucial for calculating the speed of rolling objects.

A solid sphere of radius R rolls without slipping down an incline of height h. W

What’s inside this PDF?

A solid sphere of radius R rolls without slipping down an incline of height h. W

Practice Questions

Questions & Step-by-Step Solutions

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