Torque Problems

A wrench is used to tighten a nut. A 15N 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?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

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

What is the Unit for Torque

• Nm
• N
• W
• J

Torque is the product of a force exerted on an object times the lever arm.

• True 
• False

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

When an object is experiencing a net torque

• it is in dynamic equilibrium.
• it is in static equilibrium.
• it is rotating.
• it is translating.

You apply force to a wrench to tighten a bolt. The wrench breaks in half. Select the best answer for what happens next. Assume the force applied remains constant.

• The torque is now half of what it was, because torque and distance are inversely proportional
• The torque is now half of what it was, because torque and distance are directly proportional
• The torque is now double of what it was, because torque and distance are inversely proportional
• The torque is now double of what it was, because torque and distance are directly proportional

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

• .666 Nm
•  133.3 N
• 66.7 N
• 13.3 Nm

If the torque required to loosen a nut on the wheel of a car has a magnitude of 85.0 N• m, what minimum 65 degrees from the perpendicular force must be exerted by a mechanic at the end of a 22.0 cm wrench to loosen the nut?

• 426.3 N
• 2.314 N
• 35 N
• 3500 N

A beam with a length of L is lifted from one end with a force of F1.  If the beam doubles in length but contains the same mass, what will the force required to lift it be in terms of F1?

• F1
• 1/2 F1
• 2 F1
• 1/4 F1

Tags

NGSS.HS-PS2-1