Forces and Motion

Accumulating: from resultant force to displacement

Physics Narrative for 14-16 Supporting Physics Teaching

Going all the way

In this episode you've concentrated on the relationships between the measures of motion, exploring the connections between acceleration, velocity and displacement.

  • Acceleration accumulates velocity.
  • Velocity accumulates displacement.

In the first episode you concentrated on the causes of motion – that is, what got things going and otherwise changed their motion: A resultant force causes a change in motion. These eight words imply a lot of understanding: the whole of the SPT: Forces topic and the whole of the SPT: Motion topic are needed to really understand the phrase. Physics may be simple but it is quite subtle.

  • Force causes acceleration.
  • Mass impedes acceleration.

Now we simply put the three together to get a very powerful synthesis: a way of building predictive models of the world that are very reliable guides to action.

  • forcemass sets acceleration
  • Acceleration accumulates velocity.
  • Velocity accumulates displacement.
appears in the relation F=ma a=dv/dt a=-(w^2)x
is used in analyses relating to Terminal Velocity
can be represented by Motion Graphs

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