Forces/ Newton's Laws
What is the unit called that measures forces
Newton
What do you need to make an electromagnet?
Wire, a power source (battery), and an iron core (like a nail)
What happens to the strength of an electric field if the distance between two charges increases?
Becomes stronger
What do we call the distance from one crest to the next?
Wavelength
Which is more reliable, analog or digital signals?
Digital
For every action, there is an _____________ reaction.
Equal and opposite
Name one way to make an electromagnet stronger.
Add more coils or increase the current
What do we call the invisible area around a magnet where magnetic forces act?
Magnetic Field
Which type of wave needs a medium to travel?
Mechanical
What does a digital signal look like?
Square Pulses/ on and off
What happens to the force between two magnets as you move them farther apart?
They become weaker
What device uses a moving magnet or coil to create electricity?
Mechanical energy to Electrical
Generator
What force causes objects that are moving to come to a stop?
Friction
Light can travel through a vacuum, but sound cannot.
True or False
True
What is one example of information sent using digital signals?
Text messages, emails, CDs, etc.
The reason why you wear a seatbelt is because of
Inertia
What is the main difference between a motor and a generator?
Motor changes electrical energy to motion; generator changes motion to electrical energy
What happens to the pitch of a sound wave if the frequency increases?
Pitch gets higher
Name two properties of waves.
Amplitude, frequency, wavelength, compression, or rarefaction
What is an example of a device that uses analog signals?
A vinyl record player (turntable), old radios, or analog clocks.
Give an example of Newtons 3rd Law
Equal and Opposite reaction.
Sit on chair, chair pushes back
Name two real-world use for electromagnets.
Junkyard crane, MRI machines, speakers, etc.
Why do we see lightning before we hear thunder?
Light travels faster that sound
Name 3 out of the 4 wave behaviors
What do we call the process of sending information as a wave?
Transmission