| Disc 3 - Work, Power and Mechanical energy. |
| Topic |
Lesson Name |
| Work |
- When do we work?
- How to calculate the value of the performed work?
- Unit of work
- When is there no work done?
|
| Power |
- What is machine power?
- How to calculate power
- Power of a car engine
- How to measure your own physical efficiency?
|
| Equilibrium principle of first class levers |
- What is a first class lever?
- How does a first class lever work?
- Application of the equilibrium principle of first class levers
|
| Types of first class levers |
- What does weighing on a laboratory balance consist of?
- How to prepare a balance for weighing?
- Fixed pulley
|
| Second class levers |
- Diagram of second class levers
- How do second class levers work?
- Applications of second class levers
- Movable pulley
- Equilibrium principle of a movable pulley
- What are the advantages of combining two pulleys?
|
| Winch. Toothed gear |
- Structure of a winch
- What are gears used for?
|
| Inclined plane. Screw |
- What are the advantages of using an inclined plane?
- What force is needed to move a body along an inclined plane?
- What does the force effort depend on?
- Other applications of an inclined plane. Screw
|
| Do simple machines decrease the amount of the work performed? |
- First class lever
- Movable pulley
- Inclined plane
|
| Simple machines efficiency coefficient |
- Simple machines efficiency coefficient
- Examples of how to calculate machine efficiency coefficient
|
| Potential energy of elasticity |
- What is energy?
- Winding up a clock spring
- What does potentialEmean
- What does the magnitude of the potential energy of elasticity stored in a spring depend on?
- Relation between work and potential energy of elasticity
|
| Potential energy of weight |
- How to change the potential energy of weight?
- Relativity of the potential energy of weight
- Examples of changes of the potential energy of weight
|
| Kinetic energy |
- Kinetic energy
- What does the kinetic energy of a body depend on?
- How to calculate the kinetic energy of a body?
- Applications of kinetic energy
|
| Reciprocal transformations of mechanical energy. |
- Conservation of mechanical energy law
- Is it possible to convert the potential energy of weight into kinetic energy?
- Is it possible to convert kinetic energy into the potential energy of weight?
- Conservation of mechanical energy law
|
| Impact of friction on the mechanical energy possessed by a body |
- What makes bodies stop?
- What happened to the kinetic energy of a body that stopped?
- What happens to the mechanical energy of bodies while they are falling through the air?
|
| Accidents and crashes |
- When does a car start to move down an inclined plane?
- Braking distance. Pedestrians, be careful!
- What happens to the kinetic energy of a car in a crash?
- How to protect the passengers
|
| Types of equilibrium |
- How to find the centre of gravity
- Point of support in the centre of gravity
- Stable equilibrium
- Unstable equilibrium
- Neutral equilibrium
- How to prevent loss of balance?
|
| Energy processes taking place inside the human body |
- Energetic effects of biological processes
- Approximate energetic effects of various processes
- Food is the source of internal energy
- Energy used while we rest
- Energy we use while working
|
