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?
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?
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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