Level Four Physics - Practical Physics

Question 1

What are uncertainties?

Answer 1

All experimental measurements have a degree of uncertainty associated with the.

Question 2

How many types of uncertainties are there?

Answer 2

1. Systematic uncertainty
2. Random Errors

Question 3

What is systematic uncertainty?

Answer 3

These occur when all measurements are affected in the same way. This means all results will be out by the same amount.

Question 4

What are random errors?

Answer 4

Random fluctuations can affect measurements from reading to reading. The best estimate of the true value is given by repeating the readings and then calculating the mean value.

Question 5

What do repeating measurements make our final results?

Answer 5

More reliable

Question 6

When is a measurement accurate?

Answer 6

When it is close to the true value

Question 7

When is a measurement more precise?

Answer 7

When it has more significant figures.

Question 8

symbol for length (metre)

Answer 8

m

Question 9

symbol for mass (kilogram)

Answer 9

kg

Question 10

symbol for time (second)

Answer 10

s

Question 11

symbol for amount of substance (mole)

Answer 11

mol

Question 12

symbol for temperature (kelvin)

Answer 12

K

Question 13

symbol for electric current (ampere)

Answer 13

A

Question 14

symbol for irradiance (candela)

Answer 14

cd

Question 15

symbol for area (square metre)

Answer 15

m2

Question 16

symbol for speed (metres per second)

Answer 16

ms-1

Question 17

symbol for acceleration (metres per second, per second)

Answer 17

ms-2

Question 18

symbol for mega

Answer 18

M

Question 19

symbol for kilo

Answer 19

K

Question 20

symbol fot milli

Answer 20

m

Question 21

symbol for micro

Answer 21

μ

Question 22

Direct Relationship

Answer 22

WHere two variable do the same thing

• if one increases, the other will increase.

Question 23

Indirect relationship

Answer 23

Where two variable do the opposite

• if one increase, the other will decrease