What if gravity were twice as strong?
Your schoolbag, and you, would weigh double.
Heavy Year
Overnight, everything on Earth weighed twice as much. Nobody knows why.
1. The Doubling
Anaya woke up feeling as though someone was sitting on her chest. Her duvet felt like a wet carpet. When she stood, her knees buckled. Her mass hadn't changed; she was still 45 kilograms of the same girl. But Earth was now pulling on her twice as hard.
The news showed collapsed balconies, stalled lifts and birds sitting stunned on rooftops, unable to take off. The government told everyone to stay home and lie down. Nobody needed to be told twice.
2. Half the Height
By the third week, people were adapting. Schools moved to ground floors. Stairs were banned for anyone over sixty. At the park, Anaya's brother tried to jump over a puddle and landed in the middle of it. With the same take-off speed he got only half as high, and he came down faster.
Cricket was a disaster. Balls dropped short of the boundary. Bowlers' bouncers barely bounced. The IPL was postponed 'until physics returns to normal'.
3. Heavy Air
The air felt thick. With twice the weight of air pressing down, the pressure at ground level doubled, and the air was squeezed closer to the ground. Grandmother's old pendulum clock in the hall ran fast, gaining about 25 minutes every hour, because a pendulum swings faster in stronger gravity.
Rockets were grounded completely. To escape Earth now, a rocket would need to reach about 15.8 kilometres a second instead of 11.2, and no rocket on the planet could do it.
4. The New Children
Years passed. The scientists still didn't know what had happened. Children born in the Heavy Years grew sturdier, with thicker bones and stronger hearts. They thought the old videos of people leaping and basketball players flying were special effects.
Anaya, now a teacher, showed her class a photo of a coconut palm thirty metres tall. 'Trees used to grow like that,' she said. A boy in the front row laughed. 'Miss, how did they get the water up?'
The end. Now see the science that the story is built on.
See it happen
What would happen, step by step
Your mass stays the same, but your weight doubles. A 45 kg student would feel like they were carrying a second student on their back. Climbing stairs would be exhausting.
The science behind it
Mass and weight are different
Weight W = m × g (45 kg × 9.81 N/kg ≈ 441 N; doubled ≈ 883 N)
Your mass is how much matter you have, and it doesn't change. Your weight is the force of gravity on that mass. Double g and every weight doubles: your bag, your body, the water in a tree's trunk, the air above you.
Jumping, falling and swinging
Jump height h = v² ÷ 2g Pendulum period T = 2π √(L ÷ g)
With the same take-off speed, doubling g halves how high you jump. A pendulum's period depends on 1/√g, so doubling g makes it swing √2 ≈ 1.41 times as fast, which is why a pendulum clock would gain about 25 minutes an hour.
Escaping a heavier Earth
Escape velocity v = √(2gR) ⟹ 11.2 km/s × √2 ≈ 15.8 km/s
For the same planet size, doubling surface gravity raises the escape velocity by √2. Rockets carry most of their mass as fuel, so even a modest increase in the speed needed makes getting to space far harder.
In one line: Weight = mass × g. Jump height is v²/(2g), so doubling g halves it. A pendulum's period depends on 1/√g, so pendulum clocks would tick about 1.41 times as fast.
Your weight on other planets →Think about it
On the Moon, where gravity is one sixth of Earth's, how many times higher could you jump with the same take-off speed?