The Universe & Stars
This type of galaxy, shaped like a pinwheel, is home to our solar system.
What is a spiral galaxy?
According to Newton's First Law, this is what happens to a crate on a moving vehicle's roof when the vehicle stops suddenly.
What is "it continues moving forward"?
This is the term for a substance like water (H₂O), made of two or more different elements chemically bonded.
What is a compound?
This is the unit used to measure the frequency of a wave.
What is Hertz (Hz)?
This is the season in the Northern Hemisphere when the North Pole is tilted most directly toward the Sun.
What is summer?
This is the category of star our Sun is, as shown on the Hertzsprung-Russell diagram.
What is a main sequence star?
This is the average speed of a police car that travels 40 kilometers in 30 minutes (in km/h).
What is 80 km/h?
This is the number of carbon atoms in the chemical formula for acetic acid, CH₃COOH.
What is 2?
This type of wave requires a medium, like air or water, to travel through.
What is a mechanical wave?
This is the name for the tide with the greatest difference between high and low water, which occurs when the Earth, Moon, and Sun are in a straight line.
What is a spring tide?
This is the stage a low-mass star, like our Sun, enters after the main sequence, where it expands and cools.
What is a red giant?
This law of motion is demonstrated when a kicker's foot applies a force to a football, and the ball applies an equal force back on the foot.
What is Newton's Third Law?
This is the type of change that occurs when two liquids are mixed and a solid, white substance forms.
What is a chemical change?
To study the Sun's super-hot corona, scientists use satellite detectors for these high-frequency, high-energy waves.
What are X-rays?
This phenomenon, demonstrated by skaters spinning, best represents the gravitational attraction between the Sun and Earth.
What is circular motion or orbiting?
This is the name for a system of billions of stars, gas, and dust held together by gravity.
What is a galaxy?
If an unbalanced force of 36 N acts on a 9 kg object, this is the object's acceleration.
What is 4.0 m/s²?
This scientific law states that the total mass of the reactants must equal the total mass of the products in a chemical reaction.
What is the Law of Conservation of Mass?
On a wave diagram, this is the term for the maximum distance the wave moves from its rest position.
What is amplitude?
This is the term for the type of energy transformation (e.g., light to chemical) that happens during photosynthesis.
What is radiant to chemical?
This is the determining factor for a star's life cycle and its ultimate fate (e.g., white dwarf, neutron star, black hole).
What is its mass?
This term describes the tendency of an object to resist a change in its motion, explaining why the crate in the $100 question keeps moving.
What is inertia?
This property of water, resulting from the attraction between water molecules, allows insects to walk on its surface.
What is surface tension?
This is the term for the bending of a wave as it passes from one medium into another (e.g., from air into water).
What is refraction?
This is the name for the tide with the smallest difference between high and low water, which occurs when the Earth, Moon, and Sun form a right angle.
What is a neap tide?