We're programmed so that we notice change. Birds that move are much easier to pick out from the background than those that don...

Physics Narrative 14-16

When the motion changes, that's when we need to provide an explanation.

Physics Narrative 14-16

Putting on forces spectacles was used as a metaphor for seeing the world in a new way in the SPT: Forces topic. Now, in the...

Physics Narrative 14-16

As you isolate an object from its environment–in order to place the object in a completely natural environment–so you'll find...

Physics Narrative 14-16

The SPT: Forces topic was focused on identifying whether there was a force or not–so on identifying the forces. Now we expect...

Physics Narrative 14-16

We've talked a lot about putting the object into its natural environment–one where there is only the mass, and none of the...

Physics Narrative 14-16

The simplest addition to the natural environment is to to have a single force acting. In practice we do this by adding a...

Physics Narrative 14-16

To get to a single resultant force you need to be able to add forces. The rules are the same as for adding any other vectors...

Physics Narrative 14-16

Forces just add as vectors, tip to tail. So if they don't happen to all be along one line, then it really doesn't matter. Just...

Physics Narrative 14-16

Charlie stands on a station and the full London bound through train rushes past. Alice, sitting on the London-bound train...

Physics Narrative 14-16

Just push for a while, causing a change in the velocity: that adds to the quantity of motion.

Physics Narrative 14-16

This idea that something is given to an object when you push or pull on it and affect its motion is common. This is often said...

Physics Narrative 14-16