2.2 Nature of Quantities

Question 1

What would a speed-time graph of the universe look like, and why?

Answer 1

y=x^2, because the universe is accelerating;

Question 2

What is the difference between a scalar and vector quantity?

Answer 2

Both have magnitude, but only vectors have direction associated with them.

Question 3

What is the replacement to using Pythagoras? How can this be linked to vectors?

Answer 3

A to-scale drawing using of vector triangles, which has split a resulting vector into two co-planar vectors.