Acceleration basics
A car goes from 0 to 72 km/h in 10 sec. What’s its acceleration?
Retardation
A bus slows from 20 m/s to 0 in 5 sec. What’s the retardation?
Graphical motion
On a velocity-time graph, what does the slope represent?
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?
Average velocity
A runner covers 100 m east, then 100 m west in 20 sec total. What’s their average velocity?
Non-zero acceleration
Can a body have zero velocity but non-zero acceleration?
Instantaneous speed
What’s the speed of a car at the exact moment a speedometer reads 80 km/h?
Uniform circular motion
Why is a satellite in circular orbit said to accelerate even at constant speed?
Inertia
Why do we fall backward when a bus suddenly starts moving?
Mass vs weight
Is your weight the same on Earth and the Moon?
Balanced vs unbalanced forces
If you push a table with 20 N and a friend pushes opposite with 20 N, does the table move?
Action-reaction pairs
When you jump off a boat, why does the boat move backward?
Momentum
Why do athletes run before taking a long jump?
Friction role
Why do cars have treaded tires instead of smooth ones?
Force without contact
How does a magnet pull an iron nail without touching it?
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