Work & Work-Energy Theorem

 

Work and Kinetic Energy

Definitions, with proof that work is difference in kinetic energy.

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  • Watch Video clip from Lecture 11 (0:00 - 7:42)

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Work in Three Dimensions

Work defined by line integral; proof that work is difference in kinetic energy in 3D.

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  • Watch Video clip from Lecture 11 (7:42 - 13:04)

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Gravitational Work

Example of gravity acting on particle; proof that work is independent of path.

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  • Watch Video clip from Lecture 11 (7:42 - 13:04)

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Two Basic Concepts

Work-Energy Theorem and conservation of mechanical energy restated.

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  • Watch Video clip from Lecture 18 (0:00 - 1:44)

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Pendulum Oscillation Calculation II

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  • Watch Video clip from Lecture 18 (19:13 - 26:39)

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Work and Energy

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

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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 (Wapplied = Fx*δ x).

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Work and Force

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

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

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Work-Energy Theorem

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

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Power

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

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Experiment 5B

Friction experiment setup and procedure.

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Work and Dot Product Problem Solving Strategies

Class problems.

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Work on Sliding Box

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

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Spring - Object on an Inclined Plane with Friction

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

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Work on a Falling Ball

Work done on a falling ball. Solution not included.

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Kinetic Energy and Friction

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

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Energy and Acceleration

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

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Kinetic Energy and Force

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

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Acceleration and Work

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

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Weightlifter

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

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Walking and Work

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

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Rolling and Work

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

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Kinetic Energy

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

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Kinetic Energy and Speed

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

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Qualitative Description of Work

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

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Work - Kinetic Energy

Motion of an object sliding down an inclined plane.

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Work Problems

4 short qualitative problems on work, forces, kinetic energy, and weight.

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Fly in a Jar

2 short qualitative problems about weighing a fly in a closed, then open, jar.

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Second Law and Kinetic Energy

Relative motion and energy of two objects.

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Suitcase on a Conveyor Belt

Dynamics of a suitcase placed on a moving conveyor belt.

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Exploding Projectile

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

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Descending a Slide

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

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Energy, Force, and Kinematics

Motion of a child sliding down a playground slide.

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Work

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

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