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physics as level unit 3 graphs general qn

ok so when u plot points on the graph and then u draw a line of best fit how do we know if the line goes through the origin like for this graph how are we meant to know if it starts from origin or not (graph of t^2 against l)

(edited 7 years ago)

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Reply 1

thefatone

Original post by pizzaqueenx

@samb1234

Reply 2

Student403

Look at the relationship. T = 2pi root( l / g)
When you square it you get T² = 4pi² * l / g
Since you're plotting T²against l, and 4pi²/g is a constant, this resembles y = mx. There is no +c (y intercept) as in y = mx + c.
So does a graph of y = mx go through the origin?