Rotational

The easiest way to open a heavy door  is by applying the force

• Near the hinges

• In the middle of the door

• At the edge of the door far from the hinges

• At the top of the door

Tags

NGSS.HS-PS2-1

If the torque required to loosen a nut on the wheel of a car has a magnitude of 60.0 Nm, what minimum perpendicular force must be exerted by a mechanic at the end of a 45.0 cm wrench to loosen the nut?

• 2700 N

•  133 N

• 27 N

• 1.3 N

Tags

NGSS.HS-PS2-1

What is the weight of the package?

• 5 N

• 10 N

• 15 N

• 20 N

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the weight of the package?

• 5 N

• 10 N

• 15 N

• 20 N

Tags

NGSS.HS-PS2-1

For a rotating rigid body, which of the following statements is NOT correct?

• All points along a rotating rigid body move with constant speed

• Points along a rotating body have velocities that continuously change directions

• Points along a rotating body move through the same angle in equal time intervals

• All of the answers are correct

What happens to his rotational inertia when a figure skater brings in his arms?

• Increase his rotational inertia

• Decrease his rotational inertia

• has no affect

A fixed point, around which something turns, perpendicular to the rotation.

• axis of rotation

• radius

• diameter

• radian

A quantity that measures the ability of a force to rotate an object  around some axis

• linear speed

• angular speed

• torque

• centrifugal speed

A wrench is used to tighten a nut as shown in the figure. A 12-N force is applied 7.0 cm from the axis of rotation. What is the magnitude of the torque due to the applied force?

• 1.71 Nm

• 0.84 Nm

• 1.71 Nm

• 0.58 Nm

• 84 Nm

What force does not cause any torque?

• Force perpendicular to the fulcrum.

• Force horizontal to the planck.

• Force slightly off center of the fulcrum

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