Rotational Motion Review

A potter's wheel, with rotational inertia 47 kgm^2 is spinning freely at 40.0 rpm. The potter drops a lump of clay onto the wheel, where it sticks a distance 1.2 m from the rotational axis. If the subsequent angular speed of the wheel and clay is 32 rpm what is the mass of the clay?

• 7.1 kg

• 8.2 kg

• 9.0 kg

• 5.5 kg

Tags

NGSS.HS-PS2-2

What direction is the torque from the diver acting on the board (with respect to post A)?

• clockwise

• Counter clockwise

• Neither Direction

• Depends on the mass of the diver

Find the magnitude of the torque produced by a 22.0 N force applied to a door at a 30 degree angle a distance of  .005 km from the hinge.

• 55 Nm

• .015 Nm

• 6.3 Nm

• 8.75 Nm

Which has more rotational inertia? (all objects have the same radius and mass)

• Hollow sphere

• solid sphere

• disk

• cylinder

Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

• the inside horse

• the outside horse

• Neither

Tags

NGSS.MS-PS3-1

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation. What is the torque applied to the wrench?

• 7.5 Nm

• 1.5 Nm

• 750 Nm

• 150 Nm

A tire of 68cm in diameter travels 9.2km. How many revolutions does it make?

• 43.00 rads

• 567 revs

• 4300 revs

• 68cm

A 800N man is playing on a seesaw with son who has a weight of 200N. If the child is sitting 3 meters away, how far will the man have to sit to balance the seesaw?

• 0.75m

• 3m

• 1.5m

• 1m

Tags

NGSS.MS-PS2-2

What force does not cause any torque?

• Force perpendicular to the fulcrum.

• Force perpendicular to the bar applied at its end.

• Force slightly off center of the fulcrum

• Forces at a 45 degree angle to the fulcrum, and not on the fulcrum

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

• The larger person moving further away from the center.

• Moving the smaller person closer to the center.

• Moving the smaller person further from the center.

• Making the larger person do nothing.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4