Work Done/Kinetic
Electricity
Magnetism
Particle Model
Maths Practice
100
What is the formula for work done?
work done = Force x distance
100
Define Current
The flow of charge/electrons around a circuit
100
What would happen when the following two magnets are brought close together?
Repel
100
What is the term for a gas cooling into a liquid?
Condensation
100
What is the resistance in a circuit with a potential difference of 10 V and a current of 2 A? (Include units)
V=IR
5Ω
200
List 2 non-contact forces and 2 contact forces
Non contact: Magnetic, gravitational, electrostatic
Contact: air/water resistance, tension, friction, normal, etc
200
What is the unit for charge?
Coulomb
200
How can you tell where the strongest magnetic field is?
Where the lines are densest?
200
What temperature is absolute zero? Give your answer in oC and K
-273oC and 0 K
200
What is the density of a 5 m3 block of wood with a mass of 5 kg? (Include units)
d=m/V
25 kg/m3
300
What does the spring constant represent?
How much force is required to stretch the spring by 1m. (N/m)
300
State Ohm's Law
Current is directly proportional to potential difference, so long as resistance is constant.
300
Describe how you could discover and draw the magnetic field around a magnet.
Scatter iron filings to see field, use plotting compass to plot direction of magnetic field.
Use multiple compasses to plot field around.
300
What is temperature a measurement of?
Average kinetic energy
300
How far has a spring extended if 50'000J of energy is put into it and it has a spring constant of 500 N/m? (Give your answer to 3 sig figs)
E=0.5mx2
14.1 m
400
Define the limit of proportionality?
When elastic stretching becomes inelastic
400
If you had an LDR and a thermistor in a circuit, what environmental conditions would produce the highest current in the circuit?
Hot and bright.
400
List 2 ways you can increase the strength of a solenoid.
Increase current
Increase number of coils
Add an iron core in the middle
400
Why should you never leave a can of airspray in the sun on a hot summer day? Explain using the concept of pressure and kinetic energy.
temperature makes particle hit side more often. This increases pressure. If pressure is to high, the can will explode.
400
What is the Energy transferred over 20s in a bulb with a resistance of 20Ω and a current of 10 A? (Include Units)
P=E/t P=I2R
E=QV P=IV
40000 J
500
Where is it easiest to stretch the rubber band?
B
500
Why is the current vs p.d. graph for a filament bulb not directly proportional?
As the p.d. increases, the light bulb gets hotter and its resistance increases.
500
Which direction would the wire be pushed?
Down
500
An icecube is placed over a bunsen burner. For a period of time, the temperature of the icecube does not change. Explain what must be happening during this time. (Include what the particles are doing in your answer).
The energy is going to breaking the intermolecular bonds between the particles, turning the solid into a liquid.
500
A 2 kg beaker of water (c=4184 J/Ckg) takes 669'440 J of energy to heat to boiling (100oC). What temperature did the water start at?
ΔQ=mcΔθ
20 cC