Physics Module 2

What are the S.I units?

A, K, s, M, Kg, Mol, Cd

Whats accuracy?

How close to the real value

Whats presicion?

How much variation you get in repeat measurements

How are systematic errors caused and how do you remove them?

Faulty equipment, Calibration error, incorrect measurements

Remove by using more accurate techniques

What are random errors and how do you remove them?

Changes in environment, noise in electronics, statistical error

Remove by repeating and averaging

How do you find the uncertaincy ?

Largest value - smallest value /2

How do you find the Percentage uncertainly?

( Absolute uncertainly / measured value ) x100

What do you do to uncertaincy's when you add or subtract measured values?

You add the uncertainty's together

What do you do to uncertaincys when divide /multiply measured values together ?

You add percentage uncertaincys together

What do you do with the uncertaincy's when the measured value has a power

You multiply the power no by the percentage uncertaincy

What's a vector?

A physical quanity that has both direction and magnitude.

What's a scalar?

A physical quality that has only magnitude

What are vector quanitys?