Units and formulae

Question 1

What are the 2 types of quantities?

Answer 1

Scalar and Vector quantities.

Question 2

What is a scalar quantity?

Answer 2

A scalar quantity is something that has only magnitude, no direction

Question 3

What is a vector quantity?

Answer 3

A vector quantity is something that has direction and magnitude

Question 4

Which type of quantity is speed an example of?

Answer 4

Scalar

Question 5

What type of quantity is displacement a type of?

Answer 5

Vector quantity

Question 6

What is negative velocity?

Answer 6

They are going backwards

Question 7

What are the units in the SI called?

Answer 7

Base units

Question 8

What are units made up of other units called?

Answer 8

Derived units

Question 9

What are the 7 base units?

Answer 9

Mol
Kelvin
Seconds
Amperes
Metre
Kilograms
Candella

Question 10

What is a derived unit?

Answer 10

Unit that is made up of other units

Question 11

How is speed a derived unit?

What units are speed made up of?

Answer 11

Metres/seconds, m/s

Question 12

What are commensurate units?

Answer 12

Units that can be converted, eg, metres and centimetres

Question 13

What are incommensurate units?

Answer 13

Units that you cannot convert, eg, seconds and metres

Question 14

What is N/M^2 equal to

Answer 14

NM^-2

Question 15

Can you?

Answer 15

Identify formulae and equations

Label terms in an equation

Manipulate equations to change ‘the subject’

Understand the terms commensurate and incommensurate units

Identify base units and derived units

Use prefixes and be able to convert units from one form to another

Use the homogenous nature of meaningful physical equations to derive unit

Define and identify vectors and scalars

Add and subtract vectors through the use of diagrams

Question 16

What is the ‘delta’ sign?

Answer 16

Triangle in front of symbol

Question 17

What does delta mean?

Answer 17

It means change in

Question 18

When rearranging formula, when you do something to one side of the equation you must __ __ ___ _____ ____ __ ___ ________

Answer 18

Do it to the other side of the equation

Question 19

Is force a scalar or vector quantity?

Answer 19

Vector because we draw an arrow and we draw it in the direction the force is acting on

Question 20

What is the difference between a formulae and an equation?

Question 21

What is nano

Give the decimal number

Answer 21

0.000000001.

Question 22

What is micro

Give the number

Answer 22

0.000001.

Question 23

What is milli

Give the number

Answer 23

0.001.

Question 24

What is centi

Give the number

Answer 24

0.01.

Question 25

What is kilo

Give the number

Answer 25

1000.

Question 26

What is mega

Give the number

Answer 26

1000000.

Question 27

What is giga

Give the number

Answer 27

1000000000.

Question 28

What is standard form?

Answer 28

Standard form is used to represent very large or very small numbers. In standard form numbers are written in the format: A x 10n where A is a number between 0 and 10 and n is how many places to move the decimal point.

Question 29

How do we add vectors?

Answer 29

We draw the head of Vector B touching the tail of vector A

Question 30

How do we subtract vectors?

Answer 30

We draw vector B in the opposite direction from Vector A

Question 31

What is subtracting vectors equal to?

Answer 31

Add a positive vector to a negative one