Topic — Concepts of work, energy and their conservation in mechanical systems.
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04
Linked atoms
86 linked atoms.
04 Energy and work
- Friction: from kinetic to thermal
- How to draw a bubble diagram
- From interaction to bubble diagram
- Definition and formula of work
- Kinetic energy
- Elastic potential energy
- Gravitational potential energy
- Thermal energy and specific heat
- Thermal equilibrium
- Worked example: minimum height for the loop
- Worked example: block on an inclined plane with a spring and friction
- Worked example: apple and spring
- Forces with and without potential energy
- Conservative forces
- Constraint forces
- The loop-the-loop: an energy approach
- The work done by friction
- The general energy-balance theorem
- Joule and the mechanical equivalent of heat
- Energy as a silent accountant
- Energy: a currency that is conserved
- The potential-energy parabola
- The energy table
- Period of small oscillations
- Problem: water and oil at different temperatures
- Problem: height gained by a lift
- Problem: energy balance of an engine
- Problem: block pushed with friction
- Problem: block on an inclined plane with a spring (equilibrium and oscillations)
- Problem: block on a smooth inclined plane
- Problem: cart on a smooth track
- Problem: conservation of energy with friction
- Problem: spring constant from a graph
- Problem: from kinetic energy to velocity
- Problem: ball descending on three tracks
- Problem: two springs and a box
- Problem: two boys pushing a crate
- Problem: kinetic energy of a ball
- h
- Problem: kinetic energy and doubled velocity
- Problem: science fiction physics, doubled gravity
- Problem: science fiction physics without energy conservation
- Problem: Stevin’s necklace
- Problem: work against friction
- Problem: work from a triangular force graph
- Problem: work done by a cyclist going uphill
- Problem: work done by a spring from a graph
- Problem: work done by a slanted force
- Problem: work and direction, the suitcase
- Problem: reading the E(x) graph of a pendulum
- Problem: reading the F(x) graph of a spring
- Problem: the loop-the-loop
- Problem: spring compressed by a block
- Problem: ball, spring, friction and flight (4 states)
- Problem: ball launched by a spring
- Problem: ballistic pendulum
- Problem: why the pendulum stops
- Problem: power of a lift
- Problem: vertical projectile with resistance
- Problem: ranking kinetic energies (car, ball, bike, golf ball)
- Problem: ranking kinetic energies (four objects)
- Problem: ranking power (four lifts)
- Problem: ranking power (three machines)
- Problem: efficiency of a wind turbine blade
- Problem: volcanic rock in the “Fanta” scenario
- Problem: bungee jump
- Problem: monkey and weight on a pulley
- Problem: summary, inclined plane and spring
- Problem: lifting and lowering a book
- Problem: pushing a moving crate
- Problem: estimating the kinetic energy of a car
- Problem: estimating the energy to climb stairs
- Problem: Fermi estimate, the calorie content of an apple
- Problem: Fermi estimate, power of a human being
- Problem: temperature of a car’s brakes
- Problem: change in potential energy of a box
- Problem: velocity of a pendulum
- Problem: velocity of a falling stone
- Problem: minimum velocity in the loop-the-loop
- Problem: true or false about work and energy
- Problem: true or false about work and kinetic energy
- Multi-state problems
- When work is zero
- Summary: which bubble connects what