For a given mass, its acceleration is proportional to the unbalanced force acting on it.
What does F = ma mean in words?
100
Heat transfer in solids.
What is conduction?
100
A sound wave.
Name an example of a longitudinal wave.
100
A laptop adaptor turns 220V a.c into 12V d.c. What electrical devices are needed inside it?
A transformer and a diode (for rectification).
100
What kind of energy does a falling rock have?
Kinetic energy (mostly)
200
Force x perpendicular distance to the pivot
How could you calculate a moment?
200
As water is heated it becomes less dense and rises. Further away from the heat source it cools, becomes more dense and sinks.
What is a convection current?
200
A lens that is thicker in the middle and thinner at the edges.
What is a convex/converging lens?
200
Only if both inputs are 1, the output will be 1.
Describe the action of an AND gate.
200
What is the law of conservation of energy?
Energy cannot be created or destroyed, it simply changes forms
300
Beneath the elastic limit, extension is proportional to the applied load.
What is Hooke's law?
300
Specific heat capacity.
What is measured in J/kgC?
What is the amount of heat energy needed to increase the mass of 1kg of a substance by 1 degree celcius?
300
It has shortest wavelength and highest frequency.
Where would you find gamma waves on the electromagnetic spectrum?
300
How to predict the turning force on a motor
Flemings Left Hand Rule.
F B I.
300
Is energy a scalar or a vector?
Scalar
400
Newton's first law.
Which law states "if the forces on an object are balanced, if at rest it will remain at rest, or if in motion it will move at a constant speed in a straight line"?
400
Reduce humidity, increase temperature, blow across the surface.
In what three ways could you increase the rate of evaporation?
400
Describe refraction of light as it enters a glass block.
Light slows down as it enters a more dense medium and turns towards the normal.
400
Sketch a circuit which could be used as a fire alarm circuit
......................
400
A stone of mass 4 kg slides down a smooth slope of 5 m in height. What is the stone's speed as it reaches the bottom of the slope?
10 m/s
500
PV = constant
What is Boyle's law?
500
Explain why metals expand when they are heated.
..................
500
The image is magnified, virtual and upright.
Describe the image in a magnifying glass.
500
Why is a split ring commutator used in a d.c motor?
To reverse current in loop of wire so that rotation continues
500
Pablo is standing 3 m from the checkout at the supermarket holding a 20N bag of potatoes for 10 minutes. How much work is he doing?