Work & Work-Energy Theorem

Work and Energy

• 8.01 Physics I, Fall 2003
  Prof. Stanley Kowalski

Definition of the work-energy principle; work in one and three dimensions; variable force and work. Includes several examples.

Course Material Related to This Topic:

• Read lecture notes, pages 4–6
• Read lecture notes, pages 7–15

Energy transformations and conservation of energy; energy of system and surroundings; definition of kinetic energy, with equation (K = 1/2*m*v²); definition of work done by a constant force, with equation (W_applied = F_x*δ x).

Course Material Related to This Topic:

• Read lecture notes, pages 1–11

Work and Force

• 8.01L Physics I: Classical Mechanics, Fall 2005
  Dr. George Stephans

Course Material Related to This Topic:

Work done by a force (W = F*d); conservation of energy.

• Read lecture notes, pages 1

Work done by objects moving against forces. Solution not included.

• Complete practice problem 1

Work-Energy Theorem

Relation between work done and change in energy; when to use work-energy; potential energy defined; calculating changes in potential energy.

• 8.01L Physics I: Classical Mechanics, Fall 2005
  Dr. George Stephans

Course Material Related to This Topic:

• Read lecture notes, pages 1–2

Power

Definition of Work-Kinetic Energy Theorem (K_f = K_i + W_f,i); work done by non-constant force; work done along an arbitrary path; line integrals; definition of average power; definition of instantaneous power.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Read lecture notes, pages 20–9

Experiment 5B

Friction experiment setup and procedure.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Read lecture notes, pages 30–40

Work and Dot Product Problem Solving Strategies

Class problems.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Read lecture notes, pages 1–4

Work on Sliding Box

4-part problem; finding work in terms of frictional force; stopping time; work to accelerate the box.

• 8.01 Physics I, Fall 2003
  Prof. Stanley Kowalski

Course Material Related to This Topic:

• Complete practice problem 5

Spring - Object on an Inclined Plane with Friction

Motion of an object pushed by a spring up an inclined plane.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 21
• Check solution to practice problem 21

Work on a Falling Ball

Work done on a falling ball. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 1

Kinetic Energy and Friction

Change in kinetic energy of a puck sliding along a horizontal surface with friction. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 5

Energy and Acceleration

Energy required to accelerate a car from rest to 10 mph, and from 10 mph to 20 mph. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 6

Kinetic Energy and Force

Kinetic energy of a particle under the action of a variable force. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 7

Acceleration and Work

Work done on an accelerating block by the force of friction. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 8

Weightlifter

Work done by a weightlifter holding a barbell. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 9

Walking and Work

Work done by the floor on the feet of a walking person. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 10

Rolling and Work

Work done on a ball rolling in a spiral path along the inside of a hollow cylinder. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 11

Kinetic Energy

Graph of kinetic energy of a falling object. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 3

Kinetic Energy and Speed

Speed of a ball dropped into a jar of oil. Solution not included.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 4

Qualitative Description of Work

Work done on a block by one person relative to that done by another person.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 3
• Check solution to practice problem 3

Work - Kinetic Energy

Motion of an object sliding down an inclined plane.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete practice problem 4
• Check solution to practice problem 4

Second Law and Kinetic Energy

Relative motion and energy of two objects.

• 8.01L Physics I: Classical Mechanics, Fall 2005
  Dr. George Stephans

Course Material Related to This Topic:

• Complete exam problem 1
• Check solution to exam problem 1

Suitcase on a Conveyor Belt

Dynamics of a suitcase placed on a moving conveyor belt.

• 8.01L Physics I: Classical Mechanics, Fall 2005
  Dr. George Stephans

Course Material Related to This Topic:

• Complete exam problem 9
• Check solution to exam problem 9

Exploding Projectile

Finding the energy released by the explosion of a vertically launched projectile.

• 8.01L Physics I: Classical Mechanics, Fall 2005
  Dr. George Stephans

Course Material Related to This Topic:

• Complete exam problem 8
• Check solution to exam problem 8

Descending a Slide

Frictional work, speed at bottom, and transit time for sliding down.

• 8.01X Physics I: Classical Mechanics with an Experimental Focus, Fall 2002
  Dr. Peter Dourmashkin, Prof. Kate Scholberg

Course Material Related to This Topic:

• Complete exam problem 10
• Check solution to exam problem 10

Energy, Force, and Kinematics

Motion of a child sliding down a playground slide.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete exam problem B4
• Check solution to exam problem B4

Work

Dynamics of a ball rolling down the inside of a hollow cone.

• 8.01T Physics I, Fall 2004
  Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

Course Material Related to This Topic:

• Complete exam problem 1c
• Check solution to exam problem 1c