topic 2 problem solving

Question 1

list the kinematic equations

Answer 1

1.Vf-Vi=(a x Δt)
2.Δx =(Vf+Vi) x Δt/2
3.(Vi x Δt) + (a x (Δt)^2)/2
4.Vf^2-Vi^2=(2a x Δx)

Question 2

what measurement should i present to account for margins of error?

Answer 2

measurement= best estimate ± uncertainty
(best estimate is the average)

Question 3

steps to finding uncertainty value.

Answer 3

1.find the variance of each value by (value-average)
2.add up the squared values of these variances
3.divide the total squared values by the total no. of the values
4.square root the average variance

Question 4

acceleration in free-fall problems

Answer 4

-a becomes g in free-fall problems
-the magnitude of acceleration due to gravity on earth is -9.8m/s^2 (when not taking air resistance into account
-g is negative in maths problems when the object is moving upwards, but positive if it is falling or still.

Question 5

what is accuracy?

Answer 5

-a measure of how close a value is to the true value

Question 6

what is precision??

Answer 6

-how close the measurements in a set of data agree with one another

Question 7

what is uncertainty?

Answer 7

a quantitative estimation of error present in data

Question 8

what does data with low precision, but high accuracy suggest?

Answer 8

-random errors are present
-increase the repeats

Question 9

what does data with low accuracy, but high precision suggest?

Answer 9

-systematic errors are present
-calibrate your equipment, make sure it’s up to code, or replace with more suitable equipment.