Rotational Equilibrium

Does a bridge anchored resting on two pillars have any torque?

• No, it isn't moving

• Yes, but it is at equilibrium

• Yes, but it will soon break because of the torque

• No, Bridges can't have torque

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

• linear speed

• angular speed

• torque

• centrifugal speed

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

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

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

Tags

NGSS.MS-PS2-4

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

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

When an object is experiencing a net torque

• it is in dynamic equilibrium.

• it is in static equilibrium.

• it is rotating.

• it is translating.

Why are these soldiers using a cheater pipe/bar?

• It increases the torque by increasing the radius.

• It decreases the torque by increasing the radius.

• It increases the torque by decreasing the radius.

• It's fun and cool to cheat.

A helicopter uses it tail rotor to compensate for _______.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2