SI Unit
SI unit of force?
Newton
What force pulls objects toward the Earth?
Gravity
What is Covalent Bond?
A covalent bond is a chemical bond where atoms share electrons.
Which travels faster: sound or light?
Light
What is the formula for speed?
Speed = Distance ÷ Time
SI unit for energy?
Joule (J)
What is Doppler Effect?
The change in the sound (or frequency) of something when it moves toward or away from you.
What is Isomer?
Isomers are molecules with the same formula but a different structure.
What is Amplitude?
Amplitude is the height of a wave, which tells you how much energy it has.
What is the approximate acceleration due to gravity on Earth?
9.8 m/s²
SI unit of power?
Watt (W)
What is Newton’s 3rd Law of Motion?
Whenever one object pushes or pulls on another object, the second object pushes or pulls back with the same amount of force in the opposite direction.
What is Ion?
An ion is an atom with a positive or negative charge because it gained or lost electrons.
What is Refraction?
Refraction is the bending of light or waves when they change materials.
An object is placed 40.0 cm to the left of a convex lens, and it produces an image of 24 cm to the right of the lens. Determine the focal length of the lens.
1/F = 1/P + 1/S
1/F = 1/40.0 + 1/24.0
1/40 = 3/120, 1/24 = 5/20
1/F = 8/120 = 1/15
F = 15 cm
SI unit of time?
Seconds (s)
What is Newton’s 2nd Law of Motion?
Force equals mass times acceleration, meaning bigger forces cause more acceleration, while heavier objects need more force to accelerate.
F=ma
What is Isobar?
Isobars are atoms of different elements that have the same mass number.
What is Potential Energy?
Potential energy is energy that is stored and ready to be used.
The speed of light in a glass was determined to be 1.95 x 109 m/s. Determine the glass’s index of refraction.
To find the index of refraction (n), use:
n = \frac{c}{v}
Where:
Step 1: Plug in values
n = (3.00 × 10^8) / (1.95 × 10^8)
Step 2: Divide
n = 3.00 / 1.95 ≈ 1.54
SI unit of distance?
Meter (m)
Newton's 1st Law— What will an object do if no net force acts on it?
Remain at rest or continue moving at a constant velocity in a straight line.
What is Isotope?
An isotope is an atom of the same element that has a different number of neutrons, making it heavier or lighter.
What is Kinetic Energy?
Kinetic energy is the energy of motion.
Find the speed of a wave with the following parameters: A frequency of 50Hz and a wavelength of 10 meters.
500 meters per second.
v = fλ
• v = wave speed
• f = frequency
• λ = wavelength
Given:
• f = 50 Hz
• λ = 10 m
Solve:
v = 50 × 10 = 500 m/s