APPC 12-16-24 Check In

Open Ended

How was your weekend? What'd you do? Share your goals for last week of the semester.

Angular Energy & Momentum

Multiple Choice

What is Law of Energy Conservation?

• Energy cannot be created or destroyed, only transformed.
• Energy can be destroyed but not created.
• Energy is always lost in transformations.
• Energy can be created from nothing.

Multiple Select

What type of energy (-ies) does a rotating tire have?

Select ALL that applies

• Linear Kinetic Energy

• Potential energy
• Rotational kinetic energy

• Elastic Potential Energy

Poll

All of these objects have the same total M and r.

Which one do you think will reach the bottom first?

• Cube

• Cylinder

• Shell

• Sphere

Home

Open in new tab

Copy link

Open Ended

Explain why the cube went to the bottom first

Use words like inertia, conservation of energy, linear KE, rotational KE

Open Ended

Explain why the solid sphere went to the bottom first compared to the other objects that rolled.

Use words like inertia, conservation of energy, linear KE and rotational KE

Rotational Inertia

Open Ended

What variables affect an object's rotational inertia (I)?

Rotational Inertia

• More mass = more rotational inertia

• The farther the mass is from the point of rotation = more rotational inertia = less it rolls

Multiple Choice

What does Rotational Inertia depend on?

Select ALL that applies

• Mass

• Mass Distribution

• Both Mass and its Distribution

• Neither Mass nor its distribution

​Kinetic Energy (KE)

​Rolling Motion

 Kinetic Energy of Rolling Motion is Translational KE​+ Rotational KE

Draw

Write the formulas for linear and rotational formulas for a rotating wheel

Draw

Solve for linear v for all objects to prove the order each object reached the bottom

Multiple Choice

Which of these items is easier to turn?

• Left

• Right

• Both are just as easy to turn

Multiple Choice

What happens to rotational inertia of an object when mass is moved close to axis of rotation?

• Decreases

• Increases

• Stays the Same

Angular Momentum

Multiple Choice

What is happening to the ice skater?

• Decreased Angular velocity, decreased rotational inertia

• Decreased Angular velocity, increased rotational inertia

• Increased Angular velocity, increased rotational inertia

• Increased Angular velocity, decreased rotational inertia

Draw

Write the corresponding rotational variables

Poll

Do you understand how mass distribution affects Rotational Inertia (I), and how to calculate Rotational KE, and Momentum?

Multiple Choice

A cylinder rotates with constant angular acceleration about a fixed axis. The cylinder’s moment of inertia about the axis is 4 kg m². At time t = 0 the cylinder is at rest. At time t = 2 seconds its angular velocity is 1 radian per second.

What is the kinetic energy of the cylinder at time t = 2 seconds?

• 1 J

• 2 J

• 3 J

• 4 J

• cannot be determined without knowing the radius of the cylinder