Acceleration basics
A car goes from 0 to 72 km/h in 10 sec. What's its acceleration?
Why does rusting increase the mass of iron?
Isn't rust just corroded iron?
What are the main subatomic particles of an atom?
We hear about protons, neutrons, and electrons, but what exactly are they?
Retardation
A bus slows from 20 m/s to 0 in 5 sec. What's the retardation?
Why is an atom electrically neutral?
If atoms contain charges, why aren't they charged overall?
Graphical motion
On a velocity-time graph, what does the slope represent?
What is an isotope?
Why is carbon sometimes written as C-12 or C-14?
Free fall velocity
If an apple falls from a tree and hits the ground in 2 sec, how fast is it moving just before impact?
How is atomic number different from mass number?
Students often mix these up—what's the difference?
Average velocity
A runner covers 100 m east, then 100 m west in 20 sec total. What's their average velocity?
Why do different elements emit different colors in flame tests?
Sodium glows yellow, copper gives green — why?
Non-zero acceleration
Can a body have zero velocity but non-zero acceleration?
What are energy shells or orbitals?
Why do electrons “orbit” at fixed distances?
Instantaneous speed
What's the speed of a car at the exact moment a speedometer reads 80 km/h?
What's the difference between an ion and an atom?
Why does sodium become Na⁺ in compounds?
Study Materials
Access comprehensive notes, guides, and resources to excel in your studies