Torque and moment of inertia

A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?

• cylinder
• pipe
• sphere
• They all reach the bottom at the same time.

Torque is the product of a force exerted on an object times the lever arm.

• True 
• False

The moment of inertia:

• is synonymous with mass
• does not depend on where the mass is located
• resistance to a change in rotational inertia
• more resistance to change = less inertia

Calculate the torque produced by 75- N perpendicular force at the end of a 0.20 m long wrench.

• 15 Nm

• 1.5 Nm

• 15.0 Nm

• 16 Nm