Dynamic Torque

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 car on the left-hand side, is ____meters from the fulcrum, compared to the cars on the right-hand side.

• 4.5 m
• 3 m
• 1 m
• 2 m

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

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

When an object is experiencing a net torque

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

What force does not cause any torque?

• Force perpendicular to the fulcrum, and not on the fulcrum
• Force parallel to the fulcrum, and not on the fulcrum
• Force perpendicular to the fulcrum, and slightly off center of the fulcrum
• Forces at a 45 degree angle to the fulcrum, and not on the fulcrum

The figure above shows a uniform meterstick that is set on a fulcrum at its center. A force of magnitude F toward the bottom of the page is exerted on the meterstick at the position shown. At which of the labeled positions must an upward force of magnitude 2F be exerted on the meterstick to keep the meterstick in equilibrium?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-1

What direction is the torque acting with respect to post A?

• clockwise
• Counter clockwise
• Neither Direction
• Depends on the mass of the diver

"A point at which entire weight of object concentrated toward the earth".

Identify the concept explained in the statement above.

• Free body diagram

• Concurrent forces

• Centre of gravity

• Rigid body

A mobile is shown in the figure. The horizontal supports have negligible mass. Assume that all the numbers given in the figure are accurate to two significant figures. What mass M is required to balance the mobile?

• 36 g
• 90 g
• 18 g
• 60 g

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.

• 5.0 N ∙ m
• 20 N ∙ m
• 10 N ∙ m
• 40 N ∙ m