Torque and Moment of Inertia

Why are you more stable when riding a bicycle at a faster speed?

• You have more mass

• The wheels have angular momentum

• It's not easier to ride at a faster speed

• The bike has more momentum

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According to the Law of Conservation of Angular Momentum, if I (momentum of inertia) increases, what will happen to ω?

• Decrease

• Stay the same

• Increase

A state of equilibrium is also seen below. Each of the cars weighs the same 9800 N. Despite the fact that there is only one car on the left-hand side that is 9 m from the fulcrum, the torques balance because, the cars on the right-hand side, are ____meters from the fulcrum.

• 4.5 m

• 3 m

• 1 m

• 2 m

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Which has the greater moment of inertia?

• A

• B

The moment of inertia 'I' :

• is synonymous with mass

• does not depend on where the mass is located

• is the resistance to a change in an object's rotational speed based on its mass and the distribution of that mass

• the more resistance to change in rotational speed = less inertia

What happens to his rotational inertia, also called the moment of inertia, when a figure skater brings in his arms?

• Increase her rotational inertia

• Decrease her rotational inertia

• has no affect

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

What does Rotational Inertia depend on?

• Mass

• Mass Distribution

• Both Mass and its Distribution

• Neither Mass nor its distribution

A wrench is used to tighten a nut. A 25N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 10.0 Nm

• 12.5 Nm

• 750 Nm

• 150 Nm

A 1000N man is playing on a seesaw with son who has a weight of 250N. If the child is sitting 4 meters away, how far will the man have to sit to balance the seesaw?

• 0.75m

• 3m

• 1.5m

• 1m

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