Force
What do you call a push or a pull?
Force
How will two magnets behave if both of their north poles are facing each other?
The magnets will repel
In order for a light bulb to turn on, there has to be what type of circuit?
What is produced when there is movement of an electric charge or current through an electromagnet?
A Magnetic Field
What do you call the part of a motor that rotates when energy is transferred to it?
Shaft
An opposing force acting between surfaces in contact. This acts to resist motion.
Friction
What tool can help detect the presence of a magnetic field?
A compass
Which part of a circuit stores energy?
The battery
What do you call a piece of iron that behaves like a magnet only when it is under the influence of an external magnetic field?
Temporary magnet
Which part of the motor transfers the electric current to the commutator?
Brushes
What is the unit of measurement for Force?
Newton (N)
Fill in the blanks:
Magnetic field lines always go from the __________ pole towards the ____________ pole.
NORTH pole towards the SOUTH pole
What is the pathway for the flow of electricity called?
Circuit
What material (element) did we use to create a magnetic field in our electromagnet?
Copper wire
Which part of the electric motor is a type of temporary magnet?
The electromagnet
If a person is pulling on a rope with 29 N to the left, and another person is pulling on the rope in the opposite direction (to the right) with 40 N; what is the net force and what direction will the rope move?
Net Force is 11 N to the right
Why are you able to pick up more paper clips with two magnets compared to just one magnet?
Two magnets will have a bigger and stronger magnetic field
What is the flow of electricity through a wire called?
What is the material that becomes a temporary magnet when electricity flows through coils of wire wrapped around it?
Iron core
Which part of the motor acts as a switch by changing the direction of the electric current?
The commutator
Fill in the blank:
A force must be ____________ than the opposing force acting on the object in order for it to move.
greater than
Materials that are magnetic have polarity; what does it mean to have polarity?
Something with polarity will have opposing forces.
Which part of a circuit can be turned "on" and "off" to create an open or closed circuit?
The Switch
What is the difference between an electromagnet and a permanent magnet?
Electromagnets are temporary magnets that can be turned "on" and "off", permanent magnets can not.
What causes the shaft to rotate in an electric motor?
The repelling force between the permanent magnets and the electromagnets.