Semester 2 Review #1 2019

The rotational inertia of a pencil is greatest about an axis

• about its end, like a pendulum.

• along its length, where the lead is.

• about its midpoint, like a propeller.

Stand a broom upright on the end of its pole and let it topple to the floor. Repeat, but with the bristles end on the floor. The faster fall will be the broom standing on its

• bristles-end

• pole end

• the same either way

When railroad tracks make a curve, the outer track is longer. This means a wheel that rides on the outer track needs to somehow

• roll slower than the wheel on the inner track.

• roll faster than the wheel on the inner track.

• maintain the same speed as the wheel on the inner track.

Which of these has its center of mass where no mass exists?

• basketball

• baseball

• golf ball

The long, heavy tail of a spider monkey enables the monkey to easily vary its

• momentum

• inertia

• center of gravity

• weight

When a twirling ice skater brings her arms inward, her rotational speed

• remains the same

• decreases

• increases

The main reason a person weighs less at the equator than at the poles involves the

• law of action and reaction

• spin of the Earth

• influence of the Sun, Moon, and all the planets

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is

• 3.14 m/s

• 6.26 m/s

• 1 m/s

• 2 m/s

The center of mass of a human body is located at a point that

• changes as a person bends over.

• is fixed, but different for different people.

• is always directly behind the belly button

Compared with a force, a torque involves

• leverage

• rotation

• distance from an axis of rotation.

• all of the above