Torque problems

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

Use formula: F(left) x r(left) = F(right) x r(right)

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.HS-PS2-1

What is the Unit for Torque

• Nm
• N
• W
• J

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 0.45m wrench to loosen the nut?

• .666 Nm

• 133.3 N

• 66.7 N

• 13.3 Nm

A construction worker is worried about applying too much torque to a bolt using his wrench.  What could he do to reduce his torque on the bolt?

• Increase the length of the wrench
• Increase the force on wrench
• Reduce the length of the wrench
• Reduce the friction between the bolt and wrench

Tags

NGSS.HS-PS2-1

A state of equilibrium is also seen below. Each of the three 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

Find the magnitude of the torque produced by a 5.0 N force applied to a door at a perpendicular distance of 0.65m from the hinge.

• 75 Nm

• 3.25 Nm

• 6.3 Nm

• 8.75 Nm

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-PS2-1

NGSS.MS-PS2-2