What is the thing that keeps everything on Earth from flying into the air?
The force of Gravity (not friction!)
Type of friction force that happens when a body moves through water.
Fluid resistance
Resistance of a fluid to change in shape is called...
Viscosity
... takes place when an object touches other object.
Friction
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: Heavier objects require more force to move and stop.
True
An object can change its motion from rolling friction into....
Sliding friction
True or False: Friction allows us to grip objects and to stand up.
True.
...can be any object that is rotating / turning on an axis.
Rolling friction
What unit do we use to measure force?
Newtons
... is the force of gravity on a person or object at the surface of a planet.
Weight