Physics Innit

Question 1

The main renewable energy sources are:

Answer 1

Wind
Solar
Geothermal
Water waves
Biofuels
Hydro-electricity
Tidal

Question 2

Strongly ionising:

Answer 2

Alpha

Question 3

Moderately ionising:

Answer 3

Beta

Question 4

Earth wire:

Answer 4

Yellow/green
Safety wire to stop the appliance becoming live

Question 5

Three cons of nuclear power:

Answer 5

Very expensive to build
Risk of a nuclear meltdown
The waste is radioactive and very expensive to store

Question 6

Neutral wire

Answer 6

Blue
Completes the circuit

Question 7

Three cons of solar and wind power

Answer 7

Relatively high upfront costs

Their power production is dependent on the weather and therefore inconsistent

Take up alot of land space

Question 8

What is the equation for wave speed?

Answer 8

Wave speed = frequency × wavelength

Question 9

What is the equation for GPE?

Answer 9

Mgh

Question 10

Resistance practical:

Answer 10

Tape-metre ruler-wire

Move the clips further apart to increase the lengths of the wire in the circuit. Measure the resistance.

Question 11

What is the equation for charge flow?

Answer 11

Charge flow = current x time
(Q=it)

Question 12

Density practical

Answer 12

Density=m/v
Density tells us the mass for a given volume

Regular objects
Determine mass using balance
To work out the volume, use a ruler and measure the length of the sides. Volume = length of the side ³. Put it in the equation

Irregular objects
Mass using balance
Fill eureka can using water, put a measuring cylinder under the spout.
Place object in water, it will cause water to be displaced and flow out from the spout.
Measure rhe volume of the water displaced. Same as volume of the object

Question 13

What is gravity and what properties affect the strength of gravitational attraction?

Answer 13

Gravity is the force of attraction between 2 objects.

Two factors that affect the strength are:
The mass of the two objects
The distance between the two objects

Question 14

What are the disadvantages of biofuels?

Answer 14

They require a large area of land to grow

They require a lot of energy to harvest, process and transport.

Question 15

Weakly ionising

Answer 15

Gamma

Question 16

What is the equation for potential difference?

Answer 16

Current x resistance
(V = IR)

Question 17

What are the main pros of nuclear power

Answer 17

Nuclear fuels such as plutonium and uranium are relatively cheap

Nuclear power plants can produce large and steady electric power

Nuclear power does not produce any greenhouse gases

Question 18

Charge and mass of a proton

Answer 18

Charge = +1
Mass = 1

Question 19

Charge and mass of a neutron

Answer 19

Charge = 0
Mass = 1

Question 20

Live wire

Answer 20

Brown
Provides the alternating potential difference from the supply

Question 21

What is the equation for power?
(Resitance)

Answer 21

Power = (current)² x resistance
P= I²r

Question 22

What is the equation for power?

Answer 22

Work done/time taken
Energy transferred/time taken

Question 23

What is the equation for kinetic energy?

Answer 23

1/2 x mass x speed² (v²)

Question 24

Thermal insulation practical

Answer 24

Place small beaker into larger beaker
Kettle boil water, transfer 7
80cm³ of hot water into small beaker
Place a piece of cardboard as a lid for the beakers, but leave a hole in the middle for the thermometer
Thermometer into the hole
Record starting temperature and start stopwatch
Record temp every 3 mins for 15 mins
Repeat same using volume of hot water, however this time use insulating materials to fill the gap between the beakers. Use the same mass in each case.
Record in table + cooking curces for differential.

Thickness affects thermal insulation
Beaker 80cm³, hot water, measure every 3 mins for 15.
Repeat but for 2 layers of newspaper around the beaker, Repeat again 2 more times using 4 and 6 layers

Question 25

What is the voltage between the live and neutral wire?

Answer 25

230V

Question 26

Step up transformers are used to:

Answer 26

Increase the voltage decrease the current

Question 27

Finish the sentence
-cannot penetrate paper:
-can penerate paper but not 5mm of aluminium:
-can penetrate aluminium but cannot thick lead:

Answer 27

Alpha
Beta
Gamma

Question 28

List the different ways that energy can be transferred

Answer 28

Electrically
Mechanically
Infrared radiation
Through heating
Sound or light waves

Question 29

Nuclear fission is the joining together of……
During nuclear fission the total mass of the particles….

Answer 29

Nuclei
Decrease

Question 30

Explain one environmental effect of generating electricity using fossil fuels

Answer 30

Releases carbon dioxide which causes global warming

Question 31

Types of radiation
No charge:
Positive charge:
Negative charge:

Answer 31

Gamma
Alpha
Beta

Question 32

What does direct potential difference mean?

Answer 32

The polarity of the supply does not change

Question 33

What are the units of power

Answer 33

Watts

Question 34

What are the advantages of biofuels

Answer 34

Easy to transport
Renewable
Can be used in cars

Question 35

What are isotopes

Answer 35

Same number of protons but different number of neutrons

Question 36

What is the equation for total resistance

Answer 36

R1 + R2

Question 37

Charge and mass of an electron

Answer 37

Charge = -1
Mass = very small

Question 38

What are dependent, control and independent variables?

Answer 38

Dependent: Measure
Control: keep the same
Independent: Changing