TORQUE - Rotational Force

TORQUE Rotational Force General Physics November 28, 2016 Focus Questions write each question and leave spaces for the answers 1. Define Torque using only two words. 2. What does net Torque produce? 3. Torque depends on what two quantities? 4. What else does Torque depend on? 5. What is the equation for Torque?

6. What are the units for Torque? 7. What are the important conversions for Torque? Net torque produces rotation Imagine a cat trying to enter a house by pushing perpendicularly on a cat-flap door. The picture to the right shows a cat-flap door hinged at the top. In this configuration, the door is free to

rotate around a line that passes through the hinge. This is the doors axis of rotation. When the cat pushes at the outer edge of the door with a force that is perpendicular to the door, the door opens. The ability of a force to rotate an object around some axis is measured by a

quantity called TORQUE. Torque depends on a force and a lever arm. If a cat pushed on the door with the same force but at a point closer to the hinge, the door would be more difficult to rotate. How easily an object rotates depends NOT only on how much force is applied but also on where the force is applied.

The farther the force is from the axis of rotation, the easier it is to rotate the object and the more torque is produced. The perpendicular distance from the axis of rotation to a line drawn along the direction of the force is called the LEVER ARM, or some textbooks call it the moment arm (based on the moment of inertia). Torque Diagram

FORCE AXIS OF ROTATION DISTANCE OF THE LEVER ARM Torque also depends on the angle between a force and a lever arm. Forces do not have to be

perpendicular to an object to cause the object to rotate. What would happen if a dog pushed on the door at angle to the door, rather than perpendicular to it as the cat did in the earlier picture? The door would still rotate, but

not as easily! Torque Equation The symbol for torque is the Greek letter tau (), and the magnitude of the torque is given by the following equation: torque = force(lever arm) = FL

Units for torque The SI units for torque is Newton meters = Nm. The English units for torque is Pounds feet = lbs ft To convert from SI to English or vise-versus you would need to use the following important conversions: 1 Newton = 0.225 pounds 1 foot = 0.305 meters

Recently Viewed Presentations

  • Rhetorical Triangle - Typepad

    Rhetorical Triangle - Typepad

    The art of making persuasive speeches Based on Aristotle's idea- speaker's ability to persuade is based on how well the speaker appeals to his or her audience in three areas: Logos Logos (Logical) means persuading by the use of reasoning...
  • Organización Anatomica Del Sistema Inmunologico

    Organización Anatomica Del Sistema Inmunologico

    GRACIAS * * * * * * * * * * * * * * * * * * * * * * * | Cells Of The Immune System Pluripotent haemopoietic stem cell Common lymphoid progenitor Myeloid progenitor Macrophage...


    Tu de laringe Imagem CT ou MRI Avaliar estruturas adjacentes: espaço pré-epiglótico ou paraepiglótico Erosão da cartilagem tireoidea Linfonódios cervicais comprometidos Tu de laringe Biópsia e histologia Microlaringoscopia direta com biópsia Histologia: CARCINOMA EPIDERMÓIDE (>90%) Histo normal hiperplasia displasia ca...
  • Sign in Phones put up Notebooks out (name tents on desks)

    Sign in Phones put up Notebooks out (name tents on desks)

    Objective: I will discover how the motion of an object is always judged with respect to some other object or point by acting out vectors and displacement. Questions: What is the difference between vectors vs scalars?(P.4B) What is the difference...
  • Before You Begin: Assign Information Classification

    Before You Begin: Assign Information Classification

    the concept of risk has always been implicit in ISO 9001 - this revision makes it more explicit and builds it into the whole management system. risk-based thinking ensures risk is considered from the beginning and throughout the process approach....
  • Ephesians 1-5 -

    Ephesians 1-5 -

    Ephesians 1:13-14 What is 'the holy spirit of promise'? Being "sealed [by the] holy Spirit of promise" means that the Holy Ghost "witnesses to the Father that the saving ordinances have been performed properly and that the covenants associated with...
  • Indoor Cranes - The Case of the Broken Sling -

    Indoor Cranes - The Case of the Broken Sling -

    P O W E R P O I N T ® T R A I N I N G Indoor Cranes— The Case of the Broken Sling Let's Talk About Cranes Operators must be trained Observe and adhere to recommended...
  • CCMs - Hong Kong University of Science and Technology

    CCMs - Hong Kong University of Science and Technology

    Discussion. Background knowledge is needed. The annotator should create Shelter and Infrastructure Need Frames, Annotators should not go too far with inferring needs that aren't directly discussed or strongly implied by the document.