PHY 3.4 Static Equilibrium and Torque

What is required for an object to be in static equilibrium?

• Net force is zero

• Net torque is zero

• Both net force and net torque are zero

• The object must be moving at a constant speed

Which of the following statements is true about torque?

• It depends only on the applied force

• It depends on the force and the perpendicular distance to the pivot

• It is measured in newtons

• It only exists in moving objects

Torque is measured in which unit?

• Newtons (N)

• Newton-meters (N·m)

• Joules (J)

• Watts (W)

If a force is applied directly at the pivot point, the torque is:

• Maximum

• Minimum

• Zero

• Equal to the force

Which of the following increases the torque produced by a force?

• Increasing the force applied

• Increasing the perpendicular distance from the pivot

• Applying the force at a 90-degree angle to the lever arm

• All of the above

A wrench applies a force of 20 N at a distance of 0.5 m from a bolt. What is the torque?

• 10 N·m

• 40 N·m

• 20 N·m

• 5 N·m

A seesaw is balanced when:

• The person sitting on one side is heavier

• The sum of torques about the pivot is zero

• The force applied on one side is greater

• Gravity pulls harder on one side

In a balanced system, what is true about the clockwise and counterclockwise torques?

• Clockwise torque is greater

• Counterclockwise torque is greater

• They are equal

• They cancel out gravity

A door opens most easily when you push:

• Near the hinge

• In the middle of the door

• Far from the hinge

• At an angle less than 90°

If a force of 10 N is applied at an angle of 30° to a lever arm 2 meters away, what is the torque?

• 20 N·m

• 10 N·m

• 5 N·m

• 17.3 N·m