We are wrapping up another science unit this week. We will spend some time reviewing on Friday so be sure to bring your notes in and any questions you may have. Listed below is a reminder of the topics we covered in this unit.
The link to the textbook resource for this unit is on the right hand side of the blog page.
- Definition of simple and complex machines
- Simple machines: 6 types, examples, and how each makes work easier (don’t forget there are 3 classes of levers and there is a fixed and a moveable pulley)
- Four effects of simple machines
- Complex machines: examples of machines that use a combination of these simple machines
- Systems and Subsystems (linkages, gears, transmissions and transfer of energy)
- Work: scientific definition and formula (Work is measured in Joules (J or NM), force is measured in Newtons (N) and Distance is measured in metres (m))
- Mechanical advantage: definition, example using numbers of how we calculate it (3 different formulas)
- Speed ratio: definition and formula.
- How a machine can make work faster
- What makes a machine “effective”?
- Mechanical Efficiency: formula(s)
- Friction
- Mechanical advantage of hydraulic systems
- Evaluating machines: what are the five criteria that we should consider when we think about how “good” a machine is?
- Progress and change: an example of a machine that has changed over time, and how
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