## Physics: torsion

Tutoring physics, terms and concepts are important. The tutor mentions torsion. In my previous post I mention torque, which means leverage that can cause a shaft to spin. An example of torque is the case of loosening a bolt with …

## Physics: torque

Tutoring physics, fundamental concepts arise. The tutor mentions torque. Torque is essentially leverage applied to an object to start it spinning. A common context is a shaft or axle on bearings; the torque might be supplied by a drive chain, …

## Diet: refined sugar consumption

Self-tutoring about eating and health: the tutor mentions something he read. When I open a new tab in Edge, the page is a checkerboard of news articles. Occasionally, one interests me, so I click and read it. Such happened today: …

## Seasons: when you can see your breath July 5

Self-tutoring about summer life: the tutor mentions a surprise. This morning I was out before 7am, arranging the yard waste for pick-up. At one point I noticed I could see my breath when I exhaled. I checked the weather conditions: …

## English: expressions: self-winding

Tutoring English, new words and expressions always come up. The tutor mentions one. This morning my wife mentioned that someone was “self-winding.” By the context I knew she meant they were a self-starter: they didn’t need to be told to …

## Driving an automatic: parking and the e-brake

Self-tutoring about driving: the tutor mentions parking “best practices” for an automatic. Like so many people (apparently), I’ve always stopped, put the car in Park, then set the e-brake. Yet nationwide says best practice is to stop, then set the …

## Units: cubic yard to cubic metre

Tutoring science, unit conversions are important. The tutor mentions a common one. Between a yard and a metre, there seems little difference: a yard is 91.44% of a metre. Yet, a cubic yard, being 0.9144×0.9144×0.9144, is only 76.5% of a …

## Technology: propulsion: ion drive

Self-tutoring about new technologies: the tutor mentions ion drive. Ion drive creates ions from stable particles, then accelerates them out the back by an electric field, generating thrust. The thrust is very low, but expends even less mass compared with …