Learn the Forces
1Gravity pulls toward Earth.
A force that pulls all objects down toward the Earth’s centre. It’s why things fall and gives us weight.
2Friction opposes sliding.
When surfaces rub, friction resists movement and can produce heat. Rough surfaces = more friction; smooth = less.
3Air/water resistance opposes motion.
Moving through air or water is slowed by resistance (drag). Parachutes use big air resistance to fall slowly.
Worked Example
Why does a parachute make you fall slowly?
Watch Out! Common Mistakes
Not because of weight! Without air resistance, all objects fall at the same rate. A feather falls slowly because of AIR RESISTANCE, not because it’s light.
We need it! Friction lets us walk, grip and stop. Without it, everything would slide — brakes and shoe grips rely on friction.
Only some! Magnets attract iron, steel and nickel — not aluminium, copper or gold. Not all metals are magnetic.
⬇ Cheat Sheet
- Gravity pulls all objects toward Earth.
- Friction opposes sliding; it can be useful (grip) or a nuisance.
- Air/water resistance opposes movement through them.
- Magnets attract iron/steel/nickel; like poles repel, unlike attract.
📖 Continue Your Journey
Quick summary
- Gravity is a force pulling objects toward Earth.
- Friction opposes sliding surfaces; air and water resistance oppose motion through them.
- Without air resistance, all objects fall at the same rate.
- Magnets attract iron, steel and nickel; like poles repel, unlike poles attract.
Frequently asked questions
What is gravity?
A force that pulls all objects toward the Earth's centre — it's why things fall and why we have weight.
Do heavy objects fall faster than light ones?
No — without air resistance they fall at the same rate. A feather falls slowly only because of air resistance, not because it's light.
Do magnets attract all metals?
No — only magnetic metals like iron, steel and nickel. Aluminium, copper and gold are not attracted to magnets.
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