Seatbelt safety
Why are seatbelts important in cars?
Heavy & light fall
Does a heavier ball fall faster than a lighter one?
Rocket propulsion
How does a rocket move in space where there's nothing to push against?
Sliding vs rolling friction
Why are ball bearings used in machines?
Weightlessness
Why do astronauts float inside the ISS even though gravity exists?
Work done zero
Does holding a heavy bag without moving it count as doing work?
Positive vs negative work
When is work negative?
Energy transformations
Where does a pendulum have max potential and kinetic energy?
Power vs energy
A 100 W bulb and a 60 W bulb are on for an hour. Which uses more energy?
Mechanical advantage
Why do we use long handles in wrenches?
Kinetic energy
Why does a fast-moving truck have more stopping distance than a slow car?
Conservation of energy
Can a roller coaster ever climb higher than its starting point without external energy?
Horsepower
Why do sports cars advertise “400 HP engines”?
Potential energy
Does lifting a book and holding it at height involve energy?
Efficiency
Why are machines never 100% efficient?
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