Answer:

What might happen If there is no..

Gravity

1. Launching of rockets would have been easier with higher speed, because there is no requirement of escape velocity
2. Normal ball point pens would not have been invented
3. There will be no requirement of lifts and escalator. Because you can walk vertically on buildings
4. Peaks and mountain (heights) will not be scarier
5. There would no requirement of water to swim, Only air would have been enough to float around
6. Finally droping of bomb on HIROSHIMA and NAGASAKI would have never happened
7. there wouldn't be solar system.. (i don't think of it,thanks John doe )

A. Gravity - The weakest force of nature, which depends on mass. Without gravity, we wouldn't have planets, stars, galaxies, solar systems, the universe itself would be such a boring place. Without gravity, there would only be hydrogen and traces of helium gas in the universe and nothing else. (Think about it why?)

So gravity is the force that dominates when we have huge masses, or in astronomical scales.

Friction

This will amaze you. Let's start..

1. If there is no friction then no one can survive on earth for very long.
2. If there is no friction, then no one can be born. (this is funny I know).
3. If there is no friction then we cannot walk.
4. If there is no friction then we cannot get sunlight from the sun.
5. If there is no friction then we cannot fly by airplane or helicopter.
6. If there is no friction then we would not be able to run all those machines in which friction plays a crucial role.
7. If there is no friction then we can't push or pull.
8. If there is no friction then we cannot generate energy (heat energy, Thermal, Hydro, solar, wind, all these energy) etc.
9. If there is no friction then we cannot turn pages of books.
10. If there is no friction guys cannot shave or trim their beard.
11. If there is no friction then we cannot fart or po op.

Friction is everywhere. If there is no friction then there is no life.

Friction = life

And most important, if there is no friction then you cannot give upvotes my answer and you can't encourage me to write.

Answer:

GRAVITY

GRAVITY IS IMPORTANT TO EARTH MAKING US WALK PERFECTLY

ALSO AT DRIVING AND DIFFERENT OBJECTS NOT TO FALL

IF THERES NO GRAVITY THEN.......

WE CAN CATCH A BIRD

GO BASKETBALL EASILY

AND FLY FLY LIKE A BUTTERFLY

THERE NO REASON WHY ALMOST US WANTED THE EARTH WITHOUT GRAVITY

FRICTION

FRICTION IS AN MOTION MAKING THE MOVEMENT SLOWLY LIKE SAND A BOAT

BUT IF FRICTION WAS REMOVE

THE BOAT WILL FREELY GO EVERYWHERE AS THE FRICTION DOESNT TRIGGERED