MTTC Elementary Science 103
Reflection - ANS-the bouncing back of a ray of light, sound, or heat when the ray hits a
surface that it does not go through
Refraction of light - ANS-occurs when wave of light passes from one medium to another
and the light wave is bent or refracted.
speed of light in a vacuum - ANS-It asserts that the speed of light in a vacuum has the
same value in all directions and in all inertial reference frames.
What if the bar of a magnet is broken in half? - ANS-New poles will form on the pieces
of the magnet.
Decibels - ANS-A unit of measurement of loudness
Magnetic field - ANS-Set up by an electric current. If we were to place another moving
charge or a wire carrying current into a magnetic field, a magnetic force will act on it.
Things to know about magnetic fields: - ANS-1. Always acts perpendicular to the
velocity vector.
2. Will exert no force on a charge that moves either parallel or antiparallel to the field.
3. Maximum value will occur when the test charge is moving perpendicular to the
magnetic field.
4. Magnitude of the deflecting force is directly proportional to q and v. Greater charge of
the particle, the greater the speed.
Positive and negative charges will be deflected in opposite directions.
Friction - ANS-A force that opposes motion between two surfaces that are in contact
Mass - ANS-the amount of matter in an object
Weight - ANS-A measure of the force of gravity on an object
Newton's First Law - ANS-An object at rest stays at rest and an object in motion stays in
motion with the same speed and in the same direction unless acted upon by an
unbalanced force.
*Law of inertia
, Newton's Second Law - ANS-Force equals mass times acceleration (F=ma)
Newton's Third Law - ANS-For every action there is an equal and opposite reaction
Velocity - ANS-Speed in a given direction
Mechanical waves - ANS-waves that require a medium through which to travel
electromagnetic waves - ANS-A form of energy that can move through the vacuum of
space.
A covalent bond is formed as the result of - ANS-sharing an electron pair
Weather - ANS-The condition of Earth's atmosphere at a particular time and place.
Global warming and causes - ANS-A gradual increase in average global temperature.
-Activities of mankind
-Burning fossil fuels like coal and oil (methane and carbon dioxide)
-Deforestation
Asteroid - ANS-a small rocky body orbiting the sun
Three layers of the Earth - ANS-1. Crust- outermost layer, composed of basalt and
granite.
2. Mantle- is made up of rocks.
3. Core- liquid layer, composed of iron and nickel.
Troposphere - ANS-0-17 km above Earth's surface, site of weather, organisms, contains
most atmospheric water vapor. (temperature decreases with increasing altitude,
pressure decreases)
Stratosphere - ANS-12 to 50 km, Ozone held here, absorbs UV radiation
Mesosphere - ANS-3rd layer of atmosphere. coldest layer
Thermosphere - ANS-The uppermost layer of the atmosphere, in which temperature
increases as altitude increases
Reflection - ANS-the bouncing back of a ray of light, sound, or heat when the ray hits a
surface that it does not go through
Refraction of light - ANS-occurs when wave of light passes from one medium to another
and the light wave is bent or refracted.
speed of light in a vacuum - ANS-It asserts that the speed of light in a vacuum has the
same value in all directions and in all inertial reference frames.
What if the bar of a magnet is broken in half? - ANS-New poles will form on the pieces
of the magnet.
Decibels - ANS-A unit of measurement of loudness
Magnetic field - ANS-Set up by an electric current. If we were to place another moving
charge or a wire carrying current into a magnetic field, a magnetic force will act on it.
Things to know about magnetic fields: - ANS-1. Always acts perpendicular to the
velocity vector.
2. Will exert no force on a charge that moves either parallel or antiparallel to the field.
3. Maximum value will occur when the test charge is moving perpendicular to the
magnetic field.
4. Magnitude of the deflecting force is directly proportional to q and v. Greater charge of
the particle, the greater the speed.
Positive and negative charges will be deflected in opposite directions.
Friction - ANS-A force that opposes motion between two surfaces that are in contact
Mass - ANS-the amount of matter in an object
Weight - ANS-A measure of the force of gravity on an object
Newton's First Law - ANS-An object at rest stays at rest and an object in motion stays in
motion with the same speed and in the same direction unless acted upon by an
unbalanced force.
*Law of inertia
, Newton's Second Law - ANS-Force equals mass times acceleration (F=ma)
Newton's Third Law - ANS-For every action there is an equal and opposite reaction
Velocity - ANS-Speed in a given direction
Mechanical waves - ANS-waves that require a medium through which to travel
electromagnetic waves - ANS-A form of energy that can move through the vacuum of
space.
A covalent bond is formed as the result of - ANS-sharing an electron pair
Weather - ANS-The condition of Earth's atmosphere at a particular time and place.
Global warming and causes - ANS-A gradual increase in average global temperature.
-Activities of mankind
-Burning fossil fuels like coal and oil (methane and carbon dioxide)
-Deforestation
Asteroid - ANS-a small rocky body orbiting the sun
Three layers of the Earth - ANS-1. Crust- outermost layer, composed of basalt and
granite.
2. Mantle- is made up of rocks.
3. Core- liquid layer, composed of iron and nickel.
Troposphere - ANS-0-17 km above Earth's surface, site of weather, organisms, contains
most atmospheric water vapor. (temperature decreases with increasing altitude,
pressure decreases)
Stratosphere - ANS-12 to 50 km, Ozone held here, absorbs UV radiation
Mesosphere - ANS-3rd layer of atmosphere. coldest layer
Thermosphere - ANS-The uppermost layer of the atmosphere, in which temperature
increases as altitude increases
