Random
It's all light
It's a Electric
Keep it Simple 2
Lend me your ears
100
Wax paper allows some light to pass through, so it is categorized as this.
What is translucent?
100
Most if not all light passes through this type of material.
What is transparent?
100
An incomplete circuit
What is an open circuit?
100
A device that either multiplies of redirects force
What is a simple machine?
100
The height of these tells us this 
What is amplitude?
200
A car stops quickly and your body moves forward until it is stopped by a seatbelt. This is an example of:
What is inertia?
200
Particles that make up a beam of light.
What are photons?
200
This is required to make electric circuits work. Hint: battery
What is a power source?
200
This is what simple machines create that either magnifies the force or increases the speed
What is a mechanical advantage?
200
The number of times a wave crests in a measure of time
What is frequency?
300
The motion of electrons from one place to another
What is electricity?
300
This material does not allow any light to pass through.
What is opaque?
300
Light bulb, hair dryer, refrigerator
What is a load?
300
This simple machine consists of a grooved wheel that rotates freely on a frame
What is a pulley?
300
760mph
What is Mach ? or what is the speed of sound?
400
This set of pulleys requires more rope, so there is a longer distance to pull but with less effort.
What is block and tackle?
400
When light bends. Hint: a straw in water
What is refraction?
400
definition of an electric circuit
What is a closed path through which electric current flows?
400
These two simple machines make a screw.
What is an inclined plane and a wheel and axle?
400
Sound waves would move faster this part of the core of the earth.
What is the inner core?
500
In experiment 9.3, we did this to lower the frequency of the sound.
What is add water to a glass?
500
Unlike sound, light does not need this to travel.
That is matter?
500
Anything that takes energy from the electrons as they move through the circuit.
What are resistors?
500
This simple machine increases the distance and reduces the effort.
What is an inclined plane or a pulley?
500
If the wavelength of a wave is increased, the frequency does this.
What is lowered?