Physics

Question 1

name all energy stores

Answer 1

magnetic 
internal (thermal)
chemical
kinetic
electrostatic
elastic potential
gravitational potential
nuclear

Question 2

equation for kinetic energy

Answer 2

1/2 m x v squared

Question 3

equation for elastic potential energy

Answer 3

1/2 k x e squared

(N/m) (m)

Question 4

equation for gravitational potential energy

Answer 4

m x g x h

Question 5

equation for work done

Answer 5

work done = f x d

Question 6

eqation for power

Answer 6

power = work done/time

Question 7

efficiency equation

Answer 7

useful energy/total energy

Question 8

specific heat capacity equation

Answer 8

change in thermal energy = mass x specific heat capacity x temperature change

Question 9

fossil fuels: renweable or non-renewable?

Answer 9

non-renewable

Question 10

equation for charge

Answer 10

charge = current x time

Question 11

potential difference equation (energy)

Answer 11

V = E/Q

Question 12

potential difference equation

Answer 12

V = I X R

Question 13

will current stay the same in series circuits?

Answer 13

yes

Question 14

is potential difference the same in parallel circuits?

Answer 14

no, they are shared

Question 15

equation for density

Answer 15

density = mass/volume (kg/m cubed)

Question 16

when solid turns straight to a gas:

Answer 16

sublimation

Question 17

change in thermal energy (latent heat)

Answer 17

change in thermal energy = mass x latent heat

Question 18

equation for pressure:

Answer 18

pressure = force/area

Question 19

JJ thompson’s model

Answer 19

plum pudding

Question 20

vacuum…

Answer 20

volume of no space

Question 21

rutherford discovered…

Answer 21

nuclear atom

Question 22

atom contains..

Answer 22

protons and neutrons with electrons orbiting in shells

Question 23

proton, neutron and electron charges and masses

Answer 23

proton- 1, 1
neutron- 1,0
electron-1/2000, -1

Question 24

what are isotopes?

Answer 24

atoms of the same element with a different number of neutrons

Question 25

what are ions?

Answer 25

electrically charged particles when gaining or losing electrons

Question 26

what happens during radioactive decay?

Answer 26

particles break down, emmitting radiation

Question 27

what is an alpha particle? and features….

Answer 27

contains 2 protons and 2 neutrons- can travel 5cm in air and can penetrate paper, has high ionising power

Question 28

what is a beta particle? and features….

Answer 28

contains one electron- can travel 1 metre and can go through aluminium foil, has low ionising power

Question 29

what is a gamma particle? and features….

Answer 29

an ionising radiation- can travel 1 km and can penetrate lead, has very low ionising power

Question 30

what is irradiation?

Answer 30

exposing something to radiation

Question 31

what device detects ionising radiation?

Answer 31

Geiger-Muller tube

Question 32

dangers from radiation

Answer 32

if emitted on bone marrow, risk of leukaemia or if emitted on skin, risk of cancer