Gianna1

Insulators charged by friction -when two insulators move relative to each other, friction between the two can result in both objects becoming electrically charged -one of the objects becomes positively charged and other is negatively -eg plastic being rubbed against duster -conductors can become charged but will only retain that charge of they are insulated from their surroundings. If not insulated, then any charge that builds up will leak away Charging by induction it's possible for objects t...

Charge equation I=Q/t current = charge/time Resistance equation V=IR voltage = current x resistance Voltage equation (pd) V=E/Q voltage = energy/charge Power equation energy transfer P=E/t Power = energy transfer/time power voltage equation P = IV Power = current x voltage =I^2R What is energy measured in Joules What is time measured in seconds Potential difference units Watt per Amp A resistor of resistance 2.5kΩ has a voltage of 75V applied across it. What is the current through it? R...

What causes the accumulation of charge? Describe the types of materials that can gain charge How can one 'charge ' an object? -The gain or loss of electron -Insulators -Through friction Like charges... Repel Unlike charges... Attract Hazards of static electricity -Static electricity can build up in clouds. This causes lightning - a flow of charge through the atmosphere -It is dangerous when there are flammable gases or a high concentration of oxygen. A spark could ignite the gases and cause...

What do particles gain when heated Kinetic energy What does kinetic energy make particles do Move faster in gases and liquids /vibrate more in solids What is the unit of heat energy Joule What is temperature a measure of The average kinetic energy of the particles in a substance How to make the rate of cooling faster The greater the difference in temperature between objects How to make energy flow between places If there's a difference in temperature between the two places What holds part...

Give the formula linking speed, distance and time. Give units. v = speed = m/s d = distance = m t = time = s Give the formula for calculating acceleration. Give units. a = acceleration = m/s^2 v = velocity = m/s t = time = s Give the formula linking force, mass and acceleration. Give units. F = force = N m = mass = kg a = acceleration = m/s^2 Give the formula linking pressure, force and area. Give units. P = pressure = Pa F = force = N A = area = m^2 Give the formula linking work done, force and...

What are the two poles of magnets called? north and south What is a magnetic field? an area where magnetic materials experience a force Give 4 magnetic materials: iron, steel, nickel, cobalt Is magnetism a contact or non-contact force? non-contact Fill the gap: the closer the magnetic field lines, the ________ the magnetic field stronger Where is the magnetic field the strongest? at the poles What direction do magnetic field lines point? north to south Fill in the gaps: two like poles ___...

Know and understand that insulators can be charged by friction When two insulators move relative to each other, friction between the two can result in both objects becoming electrically charged. One of the objects becomes positively charged, and the other becomes negatively charged. Charging by Induction When a neutral object is places near to a charged object, the object can become charged. If one end of an object charged by induction is momentarily earthed, the charge leaks away, and the obje...

What is an element a Substance that contains only ONE type of atom. What is a compound 2 or more elements chemically combined What is a mixture A combination of two or more substances that are not chemically combined (can be physically separated) What is the structure of ionic compounds giant ionic lattice with a regular arrangement How are the ions held together in ionic bonding? - by strong electrostatic forces of attraction Why do ionic compounds have high melting and boiling points? ele...

Speed (m/s) = frequency (Hz) x wavelength (m) Arithmetic series Sn = n x (first + last)/2 N= common difference Nth term of an arithmetic sequence (a+(n-1)d) Nth term of a geometric sequence sn = a1 (1-rn) / (1-rn) Area of a rectangle/parallelogram b x h Area of a triangle A=1/2bh Area of a trapezium 1/2 ( a + b) d Area of a circle A=πr² Circumference of a circle 2πr Volume of a cube V=s^3 Volume of any uniform prism area of cross section x length Volume of a sphere 4/3πr³ Volume...

Proton = r.m is 1, r.c is +1 Neutron = r.m s 1, r.c. is 0 Electron = r.m is 0.0005, r.c is -1 State the relative mass and charge of: a. Proton b. Neutron c. Electron The number of protons in the nucleus of an atom. What does the atomic number represent? The number of protons and neutrons n the nucleus of an atom. What does the mass number represent? NO OVERALL CHARGE - the number of protons is equal to the number of electrons. What s the overall charge of an atom? 2,8,8 What is the electroni...