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...can be any object that is rotating / turning on an axis.
Rolling friction
Resistance of a fluid to change in shape is called...
Viscosity
Two ... forces keep everything in place when an object is static.
balanced
An object can change its motion from rolling friction into....
Sliding friction
Type of friction force that happens when a body moves through water.
Fluid resistance
What is the thing that keeps everything on Earth from flying into the air?
The force of Gravity (not friction!)
Main difference between mass and weight is...
Weight is a force!
... is the force of gravity on a person or object at the surface of a planet.
Weight
... is the amount of matter in an object.
Mass
What is a force?
True.A push or pull applied to an object.
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
What unit do we use to measure force?
Newtons


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