What is a fluid as defined in the lesson?

• Any substance that can flow easily

• A liquid that cannot evaporate

• A solid that can change shape

• A gas that cannot be compressed

Tags

NGSS.MS-PS1-4

Which of the following is NOT considered a fluid?

• Water

• Oxygen

• Air

• Sand

What happens when an object falls through a fluid?

• It speeds up indefinitely

• It hits the fluid molecules, causing resistance

• It moves without any resistance

• It stops immediately

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

According to Newton's third law, what happens when an object hits fluid molecules?

• The object stops moving

• The molecules do not react

• The object speeds up

• The molecules push back with equal force

Tags

NGSS.MS-PS2-1

How does surface area affect fluid friction?

• Surface area has no effect on fluid friction

• More surface area decreases friction

• Less surface area increases friction

• More surface area increases friction

What is an example of reducing fluid friction?

• Using a streamlined shape

• Using a rough surface

• Moving slower

• Increasing the surface area

Tags

NGSS.MS-ETS1-1

What is terminal velocity?

• The maximum speed an object can reach when falling through a fluid

• The speed at which an object stops moving

• The speed at which an object starts falling

• The speed at which an object accelerates indefinitely

Tags

NGSS.MS-PS2-2

When does an object reach terminal velocity?

• When it stops moving

• When it starts accelerating

• When the force of gravity is greater than air resistance

• When the force of gravity is balanced by air resistance

Which factor does NOT affect air resistance?

• Surface area

• Speed

• Color of the object

• Shape of the object

What happens to air resistance as speed increases?

• It decreases

• It remains the same

• It disappears

• It increases