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Torque at 90 Torque at 90

Torque at 90 - PowerPoint Presentation

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Uploaded On 2017-01-19

Torque at 90 - PPT Presentation

o This has NOTHING to do with torque but it comes up when you google imagesgo figure A body in translational equilibrium will have no acceleration in the x or y directions However it still could be ID: 511502

equilibrium torque net translational torque equilibrium translational net student object force mass rotation teeter totter 100 point sit hinge

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Slide1

Torque at 90o

This has

NOTHING to do with torque but it comes up when you google images…go figure.Slide2

A body in translational equilibrium will have no acceleration in the x or y directions. However it still could be

accelerating

.

Consider a teeter-totter, with a 100 kg student on one end and a 50 kg student on the other.Although the net translational forces are zero, the system has a net torque, so it is not in equilibrium.An object in equilibrium must have both translational and rotational equilibrium.

What are the net translational forces in:The x-direction? ____________ The y-direction? ____________

100

50 Slide3

The second condition of equilibrium is that in order to have no rotation, there must be no net torque.

Torque is defined as:

force x distance to pivot

τ

= FdUnit of torque: N·mSlide4

Ex:

A torque of 24.0 Nm is needed to tighten a nut. If a person can apply a force of 100 N, what is the minimum length of wrench that is required?Slide5

Torque is a

vector quantity, which must work in either the clockwise (c) or counterclockwise (cc) directions.

If an object is in rotational equilibrium then:

Στ

= 0 or τc = τcc A few more terms we need to learn before we go on… Centre of Gravity: The position where the average weight of the object acts.

Uniform Beam: a beam of uniform shape and density Arbitrary Position of Rotation:

we can choose any point on an object and treat it as the point of rotation.Slide6

Ex:

A

350 N store sign hangs from a pole of negligible mass. The pole is attached to a wall by a hinge and supported by a vertical rope. What is the tension in the rope?

Jen + Eric Store

1.3 m

2.0 m

Extension:

What are the vertical and horizontal components of the supporting force provided by the hinge?Slide7

Ex:

Two students sit on opposite sides of an 800 N teeter-totter. Student 1 has a mass of 65 kg and sits at the very end of the teeter-totter. Student 2 has a mass of 90 kg. How far from the pivot should he sit in order to achieve equilibrium?

2.6 mSlide8

Ex:A 3500 kg truck is parked on a bridge a shown. If the bridge deck itself has a mass of 6500 kg find the supporting force provided by each of the two support posts.

15 m

5 m