Electricity and Magnetism
What is the difference between the magnetism of a bar magnet and a electromagnet?
The magnetic field in an electromagnet only last as long as the electric current.
If an object has zero acceleration could the object be moving?
Yes, due to the definition of acceleration is a change in speed.
What is a wavelength?
The distance on a wave from crest to crest or trough to trough.
What is superposition
It is the observation of fossils located in two separate rock layers that the layer of rock closest to the surface is younger than the fossils underneath it.
Define Natural Selection?
A process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.
What two factors affect magnetic force?
Size and Distance
What is the definition of speed?
Distance / Time
What is the amplitude of a wave?
Distance from the reference or starting point to the crest or trough.
What is a fossil?
A fossil is the impression of an organism, or the remains of an organism, that has been converted into rock.
What is an adaptation?
an inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment.
How would the gravitational force between the Earth and the Moon change if the moon was twice as far away?
The force would decrease
If there are two forces acting on an object. 5n to the right and 9n to the left, what is the total net force acting on the object?
4n to the left.
What is a medium?
What is a homologous structure?
Similar structures that related that related species have inherited from a common ancestor.
Define artificial selection?
It occurs when humans only breed only those organisms with desired traits to produce the next generation.
What are the two factors that affect gravitiy?
Size and distance
An object in motion wants to stay in motion unless acted upon by a force. What word does this define
Interia
Does electromagnetic waves need a medium to travel?
No
What is analogous structure?
Analogous structures are those that appear similar in both structure and function but are not considered homologous structures.
What do you call any difference between individuals of the same species?
A variation
If you have an electro magnet that is a nail wrapped around a wire like coils that is connected to an electric charge, how can you increase the strength of the magnet without increasing the charge?
The coils of the wire need to be moved closer together or more tightly wrapped.
If for every action of force there is an equal and opposite _________?
Reaction
Define
Reflection
Refraction
Absorption
Refraction is when a wave travels from one medium to the next and it slows down and bends.
Absorption is when a wave is absorbed by the object it hits.
What is evolution?
the process by which modern organisms have descended from ancient organisms.
How do scientist try to prove common ancestory?
By comparing structures of organisms to fossils and each other.