True or False: Friction speeds up moving objects.
False: Friction slows down moving objects.
What is the type of force when 2 surfaces rub together?
Friction
True or False: Friction allows us to grip objects and to stand up.
True.
... takes place when an object touches other object.
Friction
Is the friction more or less when the ground is bumpy (not flat)?
More! Smooth flat surfaces have less or no bumps and they make it easier to push objects.
... is the force of gravity on a person or object at the surface of a planet.
Weight
Is it easier to stop a bike on a sunny day or a rainy day?
It's easier to brake on a sunny day, ground is slippery on rainy days, so you get less friction = harder to stop.
What is the thing that keeps everything on Earth from flying into the air?
The force of Gravity (not friction!)
True or False: Heavier objects require more force to move and stop.
True