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What is air resistance?

• friction in the air that slows things down
• when an airplane flies into a cloud
• when you feel the air hitting your face

Tags

NGSS.MS-PS2-5

Why do we need friction?

• It helps objects go faster. 
• It helps objects go up higher.
• It helps make objects go slower or stop.

What kind of surface is a gravel and rocks?

• smooth
• rough

What kind of surface is a bowling alley? 

• smooth
• rough

What does a curved line on a distance-time graph show?

• That the speed is changing. 
• That the object is not moving. 
• That the object is constant. 

Tags

NGSS.MS-PS3-1

Friction happens in solids, liquids, and gases.

• True
• False

What is Friction?

• How much something weighs
• When 2 objects slide against each other
• How fast something is going

Tags

NGSS.MS-PS2-2

What are EQUAL forces acting on an object in opposite directions that do not change the object's motion?

• Friction
• Weight
• Balanced Forces
• Unbalanced Forces

The force that two surfaces exert on each other when they rub against each other.

• Friction
• Gravity
• Weight
• Force

If an object does not move at all, what does that mean about the forces acting on the object? 

• The forces are balanced. 
• The forces are unbalanced.