Warm Up Ch. 9 & 10 1.What is the relationship between period and frequency? (define and include formulas) 2.If an object rotates at 0.5 Hz. What is the.

Slides:

Advertisements

Similar presentations

Angular Quantities Correspondence between linear and rotational quantities:

Advertisements

Chapter 9 Objectives Calculate the torque created by a force.

Rotational Mechanics Ch. 11.

Microchip Implant Would you do this?. Review: Period (T), units - second T (seconds) = Time # of Rotations Little Bobby Bolo noticed his bolo swung around.

Torque and Rotation Physics.

Ch 9. Rotational Dynamics In pure translational motion, all points on an object travel on parallel paths. The most general motion is a combination of translation.

Foundations of Physics

Torque and Rotational Equilibrium Chapter 8. Torque Rotational equivalent of force Rotational equivalent of force Force isn’t enough to provide a rotation.

Chapter 9 Rotational Dynamics.

Ch. 11 Rotational Mechanics Torque. TORQUE n Produced when a force is applied with leverage. n Force produces acceleration. n Torque produces rotation.

Rotational Inertia and Angular Momentum. Inertia The resistance of an object to change its state of motion Depends on mass (the bigger the mass, the bigger.

Rotational Mechanics.

object moves in a circular path about an external point (“revolves”)

Rotational Motion - refers to motion of a body about a fixed axis of rotation wherein, the particles have the same instantaneous angular velocity.

Chapter 11 Rotational Mechanics. Torque If you want to make an object move, apply a force. If you want to make an object rotate, apply a torque. Torque.

Chapter 11 Rotational Mechanics Rotational Inertia n An object rotating about an axis tends to remain rotating unless interfered with by some external.

Chapter 11 Rolling, Torque, and Angular Momentum In this chapter we will cover the following topics: -Rolling of circular objects and its relationship.

Chapter 8 Rotational Equilibrium and Rotational Dynamics.

Chapter 8 Rotational Motion Forces and circular motion Circular motion = accelerated motion (direction changing) Centripetal acceleration present Centripetal.

Gravitation Attractive force between two masses (m 1,m 2 ) r = distance between their centers.

 Torque: the ability of a force to cause a body to rotate about a particular axis.  Torque is also written as: Fl = Flsin = F l  Torque= force x.

Physics 1210/1310 Mechanics& Thermodynamics Thermodynamics Lecture R1-7 Rotational Motion.

Cheyanne Rimer, Jeremy Massari, William Ortiz, Jordan Cooper, and Duncan Godsey Rotational Mechanics.

Lecture Outline Chapter 8 College Physics, 7 th Edition Wilson / Buffa / Lou © 2010 Pearson Education, Inc.

Chapter 9: Rotational Dynamics

Chapter 10 - Rotation Definitions: –Angular Displacement –Angular Speed and Velocity –Angular Acceleration –Relation to linear quantities Rolling Motion.

Torque Chap 8 Units: m N 2.

1 Physics 1100 – Spring 2009 Review for Exam I Friday, February 27 th Chapters

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.

ESS 303 – Biomechanics Angular Kinetics. Angular or rotary inertia (AKA Moment of inertia): An object tends to resist a change in angular motion, a product.

Rotational Motion. Deg, Rad, Grad There are 360 degrees in one rotation of a circe. There are 2π radians in one rotation of a circle. There are 400 gradians.

Angular Kinetics After reading this chapter, the student should be able to: Define torque and discuss the characteristics of a torque. State the angular.

Chapter 8 Rotational Motion.

CIRCULAR MOTION Mr. Theuerkauf.

Chapter 8 Rotational Motion.

Rotational Dynamics Chapter 8 Section 3.

Chapter 11 Rotational Mechanics. Recall: If you want an object to move, you apply a FORCE.

TORQUE Tor-ck. TORQUE Have you? Opened a door Turned a faucet Tightened a bolt with a wrench? You applied torque to an object.

Chapter 8 Rotational Motion.

8.2 Rotational Dynamics How do you get a ruler to spin on the end of a pencil? Apply a force perpendicular to the ruler. The ruler is the lever arm How.

Torque is a twisting force. It’s magnitude is r x F. Where r is the “moment arm” or distance to the axis of rotation. You can increase torque by just increasing.

 Angular momentum is a quantity that tells us how hard it is to change the rotational motion of a particular spinning body  Objects with lots of angular.

Chapter 9 Rotational Dynamics

Rotational Dynamics 8.3. Newton’s Second Law of Rotation Net positive torque, counterclockwise acceleration. Net negative torque, clockwise acceleration.

Rotational Mechanics. Torque When you want an object to turn or rotate, you apply a torque. Torques produce rotation.

Elizabeth, Colby, Ashley, Brittany. State and Explain Concepts  Torque is the tendency of a force to cause rotation about an axis.  Lever arm is he.

TORQUE A torque is an action that causes objects to rotate. Torque is not the same thing as force. For rotational motion, the torque is what is most directly.

Chapter 8 Rotational Motion

F1 F2 If F1 = F2… …no change in motion (by Newton’s 1st Law)

Ch 8 : Rotational Motion .

CONCEPTUAL PHYSICS Rotational Mechanics.

College Physics, 7th Edition

Unit 7 - Rotational Mechanics

PHY 131 Chapter 8-Part 1.

Rotational Inertia and Torque

Uniform Circular Motion

"I think that was the game we discovered Gary Russell as a potential short-yardage and goal-line runner," Tomlin said. "And that's been solid for us. We.

Chapter 8 Rotational Motion

Foundations of Physics

Chapter 11 Rotational Mechanics.

Objectives Calculate the torque created by a force.

Center of Gravity/Center of Mass

Torque & Angular Acceleration AH Physics

Chapter 8 Rotational Motion.

Chapter 8 Rotational Motion

9.1 Torque Key Question: How does force create rotation?

Think of it as rotational _________________.

Uniform Circular Motion

Warm Up 12/03 Solve for mass:

Presentation transcript:

Warm Up Ch. 9 & 10 1.What is the relationship between period and frequency? (define and include formulas) 2.If an object rotates at 0.5 Hz. What is the period of spin? 3.Identify the linear speed of an object that is 2 m from the center of its spin and makes 1.9 rotations per second. 4.Calculate the tension in a 3 m string that whirls a 1.5 kg object at 2.5 m/s

Warm Up Ch. 9 & 10 1.What is the relationship between period and frequency? (define and include formulas) T= 1/f and f= 1/T 2.If an object rotates at 0.5 Hz. What is the period of spin? T = 1 / 0.5 s -1 = 2 sec 3.Identify the linear speed of an object that is 2 m from the center of its spin and makes 1.9 rotations per second. V= 2  r/T = 2  2/0.53 s = 23.7 m/s 4.Calculate the tension in a 3 m string that whirls a 1.5 kg object at 2.5 m/s F= mv 2 /r = (1.5 kg)(2.5 m/s) 2 / 3m = N

Quiz Next Class!!!

Ch. 11 Rotational Mechanics

Torque Produces rotation Force is applied with leverage

Torque = Force  x lever arm distance ** Note, we will be using Newtons for Force and meters for distance!!!

Can Torques Balance???

Problem Solving Torque = Force  x lever arm Calculate the Torque produced by a 23 N perpendicular force at the end of a 0.15 m long wrench.

Problem Solving Torque = Force  x lever arm Calculate the Torque produced by a 23 N perpendicular force at the end of a 0.15 m long wrench. Torque = Force  x lever arm Torque = (23 N) (0.15 m) Torque = 3.45 N  m

Torque = Force  x lever arm Calculate the individual torques produced by the students on the seesaw if the force produced for each mass is 125 N and the lever arm distance (L) across is 2 m.

Torque = Force  x lever arm Calculate the individual torques produced by the students on the seesaw if the force produced for each mass is 125 N and the lever arm distance (L) across is 2 m. Torque Left side:(125 N N)(2m) = 500 N  m Torque right side: (125 N)(2m) = 250 N  m

Rotational Inertia An object rotating about an axis tends to keep rotating about that axis Remember Inertia is just a resistance to change.

In our lab activity before the break, which object rolled down the incline with a greater acceleration? Why?

The object with the smallest rotational inertia. The object with greater rotational inertia required more time to get rolling and accelerating!!

Rotational Inertia ( I ) of different objects

Angular Momentum Product of rotational inertia and rotational velocity Angular momentum = I x 

Can you guess what the Law of Conservation of Angular Momentum says????

If no unbalanced external torque acts on a rotating system, the angular momentum of that system is constant.

Real life example of conserved angular momentum:

In class activity.