Torque. A Comparison Which of the following do you think is easier to hold in place? 1 m 1 kg 1 m 1 kg hand Why would one be easier than the other? They.

Slides:

Advertisements

Similar presentations

Forces and Moments MET 2214 Ok. Lets get started.

Advertisements

AP Physics Mr. Jean April 27th, 2012.

Equilibrium An object is in “Equilibrium” when:

Torque Torque is defined as the tendency to produce a change in rotational motion.

Torque Chapter 8 Section 1.

Torque: Rotational Statics and Rotational Dynamics Honors Physics.

Torque, Equilibrium, and Stability

Torque and Rotation Physics.

 The ability of a force to cause something to turn 9/16 F r = length of lever arm.

Houston…we have a problem 1) You learned that if you push on a door far away from it’s hinges (the axis of.

Centripetal Acceleration. Acceleration in a circular path at constant speed a c =(v t 2 )/r Centripetal acceleration=(tangential speed) 2 /radius of circular.

Chapter 9 Torque.

Equilibrium We are interested to the study of the conditions for a body to be in equilibrim.

Force vs. Torque Forces cause accelerations

Torque & Levers Relationship between torque, force, and distance.

Torque and Angular Momentum

Translational vs. rotational motion  Translational Motion  What we talked about in earlier units  Motion of the center of mass  Rotational Motion 

Torque Rotational Motion. Torque  Forces that cause objects to rotate  Two Characteristics that contribute to the effectiveness of torque: Magnitude.

 orque  orque  orque  orque  orque  orque  orque  orque  orque Chapter 10 Rotational Motion 10-4 Torque 10-5 Rotational Dynamics; Torque and Rotational.

DETERMINATION OF TORQUE

Torque and Center of Mass

AP Physics Torque.

AP PHY_Torque. 1)What is the total amount of kinetic energy the mass has as it swings through the equilibrium position? a. 11J b. 94J c. 110J d. 920J.

Torque and Angular Acceleration Torque =  = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often.

Physics Equilibrium: Torque Science and Mathematics Education Research Group Supported by UBC Teaching and Learning Enhancement Fund Department.

11/1 Rotation, Torque  Begin Rotational Dynamics Read Ch 9 sec 1-3  Suggested problems from Ch 7 22, 35, 36, 37, 53, 55  HW: 11/1 HW Handout “Extended.

Torque and Rotational Equilibrium

Rotational Equilibrium

Torque Torque is an influence which tends to change the rotational motion of an object. One way to quantify a torque is Torque = Force applied x lever.

Chapter 4 : statics 4-1 Torque Torque, , is the tendency of a force to rotate an object about some axis is an action that causes objects to rotate. Torque.

Objectives  Know the definition of torque  Know that torque is directly proportional to the magnitude of the force and the perpendicular distance.

Chapter 8 Rotational Motion.

Torque Torque applies to a rotating rigid object (like a football) with an internal axis of rotation. A rigid object will rotate around its center of mass.

Chapter 11 Rotational Dynamics and Static Equilibrium

Rotation about a fixed axis

Chapter 8: Torque and Angular Momentum

Chapter 9 Torque.

Rotation Rotational Variables Angular Vectors Linear and Angular Variables Rotational Kinetic Energy Rotational Inertia Parallel Axis Theorem Newton’s.

Torque and Equilibrium

Rotational Motion Honors Physics. Rotational Motion Objectives: Learn how to describe and measure rotational motion Learn how torque changes rotational.

A Balancing Act. When is an object in Equilibrium? When its state of motion is not changing What are the conditions for Equilibrium? 1) the net force.

Torque and Rotation Physics. Torque Force is the action that creates changes in linear motion. For rotational motion, the same force can cause very different.

Rotational Dynamics Causes of rotational motion! Analogies between linear & rotational motion continue. Newton’s 3 Laws are still valid! But, here we write.

Chapter 8 Statics Statics. Equilibrium An object either at rest or moving with a constant velocity is said to be in equilibrium An object either at rest.

Center of Mass Torque. Center of Mass When analyzing the motion of an extended object, we treat the entire object as if its mass were contained in a single.

Rotational Motion and Equilibrium

Rotational Motion & Torque. Angular Displacement Angular displacement is a measure of the angle a line from the center to a point on the outside edge.

Unit 4, 5, and 6 Review. Newton’s Law of Universal Gravitation is based on two points First: As distance between two objects increases, gravitational.

Rotational Motion 1. Translational Motion vs. Rotational Motion Translational motion ___________ ______________________________ Example: motion of a bullet.

So far we have analyzed translational motion in terms of its angular quantities. But we have really only focused on the kinematics and energy. We have.

Moment. In addition to the tendency to move a body in the direction of its application, a force can also tend to rotate a body about an axis. The axis.

Counterclockwise Turning Effect Clockwise Turning Effect In our last lab we found that the “turning effect” depends on the force and the lever arm. Where.

1 Rotational Dynamics The Action of Forces and Torques on Rigid Objects Chapter 9 Lesson 1 (a) Translation (b) Combined translation and rotation.

Rotational Motion & Torque. Angular Displacement Angular displacement is a measure of the angle a line from the center to a point on the outside edge.

How do you start the rotation of an object? How do you open an door? What did we learn about the best way to open a door? The most efficient way to open.

TORQUE – Rotational Force

Introduction to Torque

AP Physics Section 8-4 Torque.

Introduction to Torque

Torque and Rotation Physics.

Bell Work: Centripetal Motion

Chapter 9 Torque.

Moment of a Force.

Torque Rotational analogue of Force Must contain Use door example

Torque: Rotational Statics and Rotational Dynamics

Presentation transcript:

Torque

A Comparison Which of the following do you think is easier to hold in place? 1 m 1 kg 1 m 1 kg hand Why would one be easier than the other? They are the same weight.

What is Really Happening? For the first object, there are only two forces acting on it to keep it at rest. 1 m 1 kg hand FgFg F hand Here the object is simply trying to fall downward.

What is Really Happening? (part 2) 1 m 1 kg hand With the second object you still have only two forces. FgFg F hand In this case, it is harder to hold still because you are fighting two things-- the gravitational force and its torque. In this case, the object will try to twist around the hand if it is not allowed to fall. This twisting effort is called a torque. torque

What is Torque?  Torque is a force’s ability to rotate an object.  The symbol for torque is the Greek letter   There are 3 factors that influence the torque around a point: Magnitude of the force The distance the force is from the pivot point The angle the force makes with the lever arm.  The unit for torque is a Newton-Meter (Nm) This is not the same a Joule  = F * r

1 m 1 kg hand FgFg F hand Pivot Point = hand location Lever arm for F g = 1 m Lever arm for F hand = 0 m F g is parallel to the lever arm, so it produces no torque

1 m 1 kg hand FgFg F hand Lever arm for F g = 1 m Lever arm for F hand = 0 m Pivot Point = hand location F hand has no lever arm so it produces no torque around the hand  = 90 O F g does have a lever arm, and is not parallel to that lever arm.  = (98N) * (1m)  = 98Nm Clockwise  = 98Nm So it does produce a torque around the hand.  = F * r

Directions of Torques  Since torques try to rotate objects into a circle they have only two possible directions. Clockwise (often considered negative) Counterclockwise (often considered positive)  The signs follow the standard for measuring angles  = +  = -

Net Torques  Just like multiple forces acting on an object sum up into one Net (resultant) Force. Multiple torques sum up to one net torque.   net =  counterclockwise +  clockwise Remember C.C.W. = + and C.W. = -