Physics
Physics studies these two big ideas: what stuff is made of, and how it is stored or transferred.
What are matter and energy?
The SI base unit of length.
What is the meter? (m)
The prefix kilo- means this power of ten.
What is 10³, or 1,000?
Convert 3.5 km to meters.
What is 3,500 m, or 3.5 × 10³ m?
How close a measurement is to the accepted or true value.
What is accuracy?
A quantity that has magnitude only — no direction.
What is a scalar?
Motion, forces, energy, and momentum belong to this main branch of physics.
What is mechanics?
The only SI base unit whose name already includes a prefix.
What is the kilogram? (kg)
A newton is equal to this combination of base units.
What is kg·m/s²?
Write 0.000 000 001 s in scientific notation.
What is 1 × 10⁻⁹ s?
How close repeated measurements are to one another.
What is precision?
Displacement, velocity, acceleration, and force are this type of quantity.
What is a vector?
Heat, temperature, and energy transfer belong to this branch.
What is thermodynamics?
The SI base unit of electric current.
What is the ampere? (A)
Energy and work are measured in this derived SI unit.
What is the joule? (J = N·m)
To change hours into seconds, multiply by this number.
What is 3,600?
The number of significant figures in 0.04050 kg.
What is 4?
This quantity is the straight-line change from start position to end position.
What is displacement?
A measured value is incomplete unless it is written as a number times this.
What is a unit?
This base unit measures amount of substance — a count of particles.
What is the mole? (mol)
This prefix means 10⁻⁶ and uses the Greek letter μ.
What is micro?
A car travels 90 km in 1.5 h. Give the speed in m/s to three significant figures.
What is 16.7 m/s?
4.56 cm × 1.4 cm should be reported with this many significant figures.
What is 2? (report 6.4 cm²)
Average velocity equals this quantity divided by time.
What is displacement?
Atoms, nuclei, quantum ideas, and relativity are grouped under this later branch.
What is modern physics?
Name all seven SI base-unit symbols.
What are
This derived unit equals 1/s and measures frequency.
What is the hertz? (Hz)
Write 0.000045 s in scientific notation AND with an SI prefix.
What is 4.5 × 10⁻⁵ s and 45 μs?
The estimated range around a measured value, often written with ±.
What is uncertainty?
A runner covers 400 m around a track and finishes at the starting line. This is the displacement.
What is 0 m?