Flashcards in Unit 1 - Physics On The Go Deck (59)

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1

## What is the formula for strain?

###
Strain = x/L

Strain = extension/original length

2

## What is the formula for stress?

###
Stress = force / area

σ = F/A

3

## Why is the formula for the Young's modulus?

### Stress/strain

4

## On a load extension graph, what represents the strain energy?

### The area under the graph represents strain energy

5

## What is an electron volt?

### When an electron is accelerated through a potential difference of 1v, it's change in kinetic energy is 1eV

6

## What is the unit of energy?

### A Joule

7

## What is the unit of power?

### A Watt, representing 1 joule per second

8

## What is power?

### Work done over time, measures in watts, 1 watt is 1 joule per second

9

## What are the SI base units?

###
Mass: kilogram: kg

Time: second: s

Length: metre: m

Electrical current: ampere: A

Temperature: kelvin: K

Amount of substance: mole: mol

Luminous intensity: candela: cd

10

## What is force in base units?

###
Newtons = kilogram x metre x second^-2

N = kgms^-2

11

## What is the gradient on a displacement time graph?

### Displacement / time = velocity

12

## What is energy in base units?

###
Joule = kilogram x metre^2 x second^-2

J = kgm^2s^-2

13

##
What is power in base units?

###
Watt = kilogram x metre^2 x second^-3

W = kgm^2s^-3

14

## What is frequency in base units?

###
Hertz = second^-1

Hz = s^-1

15

## What is charge in base units?

###
Coulomb = amp x second

C = As

16

## What is voltage in base units?

###
Volt = kilogram x meter^2 x second^-3 x amp^-1

V=kgm^2s^-3A^-1

17

## What is resistance in base units?

###
Ohm = kilogram x meter^2 x second^-3 x amp^-2

Ω = kgm^2s^-3A^-2

18

## What is the formula for strain?

###
Strain = change in length / length

ε = Δl/l

19

## What factor is a deca-?

### 10^1

20

## What factor is a hecto-?

### 10^2

21

## What factor is a kilo-?

### 10^3

22

## What factor is a mega-?

### 10^6

23

## What factor is a giga-?

### 10^9

24

## What factor is a tera-?

### 10^12

25

## What factor is a peta-?

### 10^15

26

## What factor is a deci-?

### 10^-1

27

## What factor is a centi-?

### 10^-2

28

## What factor is a micro-?

### 10^-6

29

## What is the vector of speed?

### Velocity

30