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What is the thing that keeps everything on Earth from flying into the air?
The force of Gravity (not friction!)
... is the force of gravity on a person or object at the surface of a planet.
Weight
True or False: Friction allows us to grip objects and to stand up.
True.
True or False: Lighter objects require less force to stop than heavier objects.
True.
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 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.
True or False: Friction speeds up moving objects.
False: Friction slows down moving objects.
... takes place when an object touches other object.
Friction
What is the type of force when 2 surfaces rub together?
Friction
True or False: Heavier objects require more force to move and stop.
True


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