The four forces shown all have the same magnitude: F1 = F2 = F3 = F4.

Slides:



Advertisements
Similar presentations
Q5.1 A car engine is suspended from a chain linked at O to two other chains. Which of the following forces should be included in the free-body diagram.
Advertisements

Physics 7C lecture 04 Dynamics Tuesday October 8, 8:00 AM – 9:20 AM
A ladybug sits at the outer edge of a merry-go-round, and a gentleman bug sits halfway between her and the axis of rotation. The merry-go-round makes a.
4. The answer depends on the rotational inertia of the dumbbell.
Copyright © 2012 Pearson Education Inc. Application of Newton’s laws: free body diagram Physics 7C lecture 03 Thursday October 3, 8:00 AM – 9:20 AM Engineering.
Newton’s Laws Rotation Electrostatics Potpourri Magnetism
Review Problems From Chapter 10&11. 1) At t=0, a disk has an angular velocity of 360 rev/min, and constant angular acceleration of rad/s**2. How.
Q5.1 A car engine is suspended from a chain linked at O to two other chains. Which of the following forces should be included in the free-body diagram.
Torque We know that Newton’s second law ( ) explains that the net force is the source of an object’s acceleration. What is the source of.
Chapter 7 Rotational Motion.
ConcepTest Clicker Questions
Rotational Dynamics Lecturer: Professor Stephen T. Thornton
ConcepTest Clicker Questions College Physics, 7th Edition
©1997 by Eric Mazur Published by Pearson Prentice Hall
2.
Physics 7C lecture 12 Torque Thursday November 7, 8:00 AM – 9:20 AM
MSTC Physics Chapter 8 Sections 3 & 4.
Physics 111: Lecture 19, Pg 1 Physics 111: Lecture 19 Today’s Agenda l Review l Many body dynamics l Weight and massive pulley l Rolling and sliding examples.
A pendulum consisting of a ball of mass m is released from the position shown and strikes a block of mass M. The block slides a distance D before stopping.
When a car accelerates forward on a level roadway, which force is responsible for this acceleration? State clearly which.
Physics 7C lecture 13 Rigid body rotation
© 2012 Pearson Education, Inc. Q6.1 A. The cable does positive work on the elevator, and the elevator does positive work on the cable. v Motor Cable Elevator.
Physics 111: Mechanics Lecture 10 Dale Gary NJIT Physics Department.
Chapter 11: Rolling Motion, Torque and Angular Momentum
The three forces shown all have the same magnitude: F a = F b = F c. Which force produces the greatest torque about the point O (marked by the red dot)?
Using the “Clicker” If you have a clicker now, and did not do this last time, please enter your ID in your clicker. First, turn on your clicker by sliding.
Physics 2 Chapter 10 problems Prepared by Vince Zaccone
Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lectures Hw: Chapter 15 problems and exercises.
Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lectures 24, 25 Hw: Chapter 15 problems and exercises.
Halliday/Resnick/Walker Fundamentals of Physics
Physics 151: Lecture 22, Pg 1 Physics 151: Lecture 22 Today’s Agenda l Topics çEnergy and RotationsCh çIntro to Rolling MotionCh. 11.
Classical Mechanics Review 4: Units 1-19
Halliday/Resnick/Walker Fundamentals of Physics 8th edition
Rotational KE, Angular Momentum
Physics 215 – Fall 2014Lecture Welcome back to Physics 215 Today’s agenda: Angular Momentum Rolling.
Chapter 8: Torque and Angular Momentum
Copyright © 2012 Pearson Education Inc. Angular momentum Physics 7C lecture 14 Thursday November 14, 8:00 AM – 9:20 AM Engineering Hall 1200.
Aim: More Law of Inertia
Q10. Rotational Motion.
Student is expected to understand the physics of rotating objects.
ROTATIONAL MOTION AND EQUILIBRIUM
Rolling, Torque, and Angular Momentum
T071 Q17. A uniform ball, of mass M = kg and radius R = 0
Physics 201: Lecture 19, Pg 1 Lecture 19 Goals: Specify rolling motion (center of mass velocity to angular velocity Compare kinetic and rotational energies.
Chapter 8 Rotational Motion.
Rotational and Translational Motion Dynamics 8
Physics 111 Practice Problem Statements 10 Torque, Energy, Rolling SJ 8th Ed.: Chap 10.6 – 10.9 Contents 11-47, 11-49*, 11-55*, 11-56, 11-60*, 11-63,
Rotational and Translational Motion Dynamics 8
Day 17 – June 17 – WBL Rotational Work and Kinetic Energy PC141 Intersession 2013Slide 1.
Exam is Wednesday at 7:00 pm Remember extra office hours
Cutnell/Johnson Physics 8th edition Reading Quiz Questions
PHYSICS 50: Lecture 10.1 RICHARD CRAIG. Homework #10 Chapter 10 We will skip 10.7 Chapter 11 Sections 1,2,3 only Exercises and Problems 10.1, 10.16, 10.41,
Experiment 5: Rotational Dynamics and Angular Momentum 8.01 W10D1 Young and Freedman: ;
PHYSICS 111 Rotational Momentum and Conservation of Energy.
Rotation RETEACH. Main Topics to be Covered Circular Motion  Remember, uniform circular motion- constant velocity Conical Pendulum A ball of mass m.
Phys211C10 p1 Dynamics of Rotational Motion Torque: the rotational analogue of force Torque = force x moment arm  = Fl moment arm = perpendicular distance.
Angular Momentum. Definition of Angular Momentum First – definition of torque: τ = Frsinθ the direction is either clockwise or counterclockwise a net.
QUESTIONS PHYSICS FOR ENGINEERS MID-TERM EXAM A2E
Q5.1 A car engine is suspended from a chain linked at O to two other chains. Which of the following forces should be included in the free-body diagram.
Which object will win? All moments of inertia in the previous table can be expressed as;
Dynamics of Rotational Motion
from rest down a plane inclined at an angle q with the horizontal.
Chapter 10: Rotational Motional About a Fixed Axis
Rolling, Torque, and Angular Momentum
Forces of Friction When an object is in motion on a surface or through a viscous medium, there will be a resistance to the motion This is due to the interactions.
Q11. Rotational Vectors, Angular Momentum
Which graph represents the motion of a ball rolling on a level friction free track? Which graph represents the motion of a ball rolling down a ramp?
A solid cylinder with a radius of 4
Experiment 5: Rotational Dynamics and Angular Momentum 8.01 W10D1
CH10 Recitation.
Presentation transcript:

The four forces shown all have the same magnitude: F1 = F2 = F3 = F4. Q10.1 F1 F3 The four forces shown all have the same magnitude: F1 = F2 = F3 = F4. Which force produces the greatest torque about the point O (marked by the blue dot)? O F2 F4 A. F1 B. F2 C. F3 D. F4 E. not enough information given to decide Answer: A

Q10.2 F1 F3 Which of the four forces shown here produces a torque about O that is directed out of the plane of the drawing? O F2 F4 A. F1 B. F2 C. F3 D. F4 E. more than one of these Answer: D

Q10.3 A plumber pushes straight down on the end of a long wrench as shown. What is the magnitude of the torque he applies about the pipe at lower right? A. (0.80 m)(900 N)sin 19° B. (0.80 m)(900 N)cos 19° C. (0.80 m)(900 N)tan 19° D. none of the above Answer: B

acts on an object at a point Q10.4 A force acts on an object at a point located at the position What is the torque that this force applies about the origin? A. zero B. C. D. E. Answer: D Explanation: Taking the individual cross products, 6k x 4i = 24j; 6k x 3j = -18i; result is (-18i + 24j) N-m Since both components of the force act perpendicular to r, sin(phi) = 1

Q10.5 A glider of mass m1 on a frictionless horizontal track is connected to an object of mass m2 by a massless string. The glider accelerates to the right, the object accelerates downward, and the string rotates the pulley. What is the relationship among T1 (the tension in the horizontal part of the string), T2 (the tension in the vertical part of the string), and the weight m2g of the object? A. m2g = T2 = T1 B. m2g > T2 = T1 C. m2g > T2 > T1 D. m2g = T2 > T1 E. none of the above Answer: C

D. not enough information given to decide Q10.6 A lightweight string is wrapped several times around the rim of a small hoop. If the free end of the string is held in place and the hoop is released from rest, the string unwinds and the hoop descends. How does the tension in the string (T) compare to the weight of the hoop (w)? A. T = w B. T > w C. T < w D. not enough information given to decide Answer: C

A solid bowling ball rolls down a ramp. Q10.7 A solid bowling ball rolls down a ramp. Which of the following forces exerts a torque on the bowling ball about its center? A. the weight of the ball B. the normal force exerted by the ramp C. the friction force exerted by the ramp D. more than one of the above E. The answer depends on whether the ball rolls without slipping. Answer: C

A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. Q10.8 F A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled to the right as shown, A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force. Answer: A

A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. Q10.9 A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled to the right as shown, F A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force. Answer: A

A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. Q10.10 F A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled straight up as shown, A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force. Answer: A

B. L stays the same; K increases. C. L increases; K stays the same. Q10.11 A spinning figure skater pulls his arms in as he rotates on the ice. As he pulls his arms in, what happens to his angular momentum L and kinetic energy K? A. L and K both increase. B. L stays the same; K increases. C. L increases; K stays the same. D. L and K both stay the same. Answer: B

A10.1 F1 F3 The four forces shown all have the same magnitude: F1 = F2 = F3 = F4. Which force produces the greatest torque about the point O (marked by the blue dot)? O F2 F4 A. F1 B. F2 C. F3 D. F4 E. not enough information given to decide

A10.2 F1 F3 Which of the four forces shown here produces a torque about O that is directed out of the plane of the drawing? O F2 F4 A. F1 B. F2 C. F3 D. F4 E. more than one of these

A10.3 A plumber pushes straight down on the end of a long wrench as shown. What is the magnitude of the torque he applies about the pipe at lower right? A. (0.80 m)(900 N)sin 19° B. (0.80 m)(900 N)cos 19° C. (0.80 m)(900 N)tan 19° D. none of the above

A10.4 A force acts on an object at a point located at the position What is the torque that this force applies about the origin? A. zero B. C. D. E.

A10.5 A glider of mass m1 on a frictionless horizontal track is connected to an object of mass m2 by a massless string. The glider accelerates to the right, the object accelerates downward, and the string rotates the pulley. What is the relationship among T1 (the tension in the horizontal part of the string), T2 (the tension in the vertical part of the string), and the weight m2g of the object? A. m2g = T2 = T1 B. m2g > T2 = T1 C. m2g > T2 > T1 D. m2g = T2 > T1 E. none of the above

A10.6 A lightweight string is wrapped several times around the rim of a small hoop. If the free end of the string is held in place and the hoop is released from rest, the string unwinds and the hoop descends. How does the tension in the string (T) compare to the weight of the hoop (w)? A. T = w B. T > w C. T < w D. not enough information given to decide

A10.7 A solid bowling ball rolls down a ramp. Which of the following forces exerts a torque on the bowling ball about its center? A. the weight of the ball B. the normal force exerted by the ramp C. the friction force exerted by the ramp D. more than one of the above E. The answer depends on whether the ball rolls without slipping.

A10.8 F A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled to the right as shown, A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force.

A10.9 A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled to the right as shown, F A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force.

A10.10 F A yo-yo is placed on a horizontal surface as shown. There is sufficient friction for the yo-yo to roll without slipping. If the string is pulled straight up as shown, A. the yo-yo rolls to the right. B. the yo-yo rolls to the left. C. the yo-yo remains at rest. D. The answer depends on the magnitude F of the pulling force compared to the magnitude of the friction force.

A10.11 A spinning figure skater pulls his arms in as he rotates on the ice. As he pulls his arms in, what happens to his angular momentum L and kinetic energy K? A. L and K both increase. B. L stays the same; K increases. C. L increases; K stays the same. D. L and K both stay the same.