What is the name of force X? (spelling matters!)

What causes force Y? (spelling matters!)

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

As the skydiver falls, what happens to the size of force Y?

• decreases

• increases

• stays the same

Tags

NGSS.HS-PS2-1

Immediately after jumping from the plane, what happens to the size of force X?

• decreases

• increases

• stays the same

Tags

NGSS.HS-PS2-1

Just after jumping out of a plane,

• Weight force is equal to the friction force

• Friction force is constant

• Weight force is greater that the friction force

• Friction force is greater than the weight force

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

After the 60 seconds, the parachutist pulls the cord and opens her parachute.

Explain how the parachute reduces the speed of the parachutist when it is just opened.

• The friction force decreases

• The weight force decreases

• The weight force increases

• The friction force increases

Tags

NGSS.MS-PS2-2

Describe the motion at point a. on the graph.

• terminal velocity

• accelerating

• decelerating

• stationary

Tags

NGSS.HS-PS2-1

If this was the journey of a parachutist, what is happening at point e. ?

• He is decelerating

• He is accelerating

• He has reached terminal velocity without his parachute.

• He has reached terminal velocity with his parachute.

Tags

NGSS.HS-PS2-1

The graph shows the vertical speed of a parachutist. At which point did they open the parachute?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

If a skydiver changes from a vertical dive to a horizontal spread-eagle position during freefall:

• His surface area would increase, causing terminal speed to increase

• His surface area would increase, causing terminal speed to decrease

• His surface area would decrease, causing terminal speed to decrease

• His surface area would decrease, causing terminal speed to increase

Tags

NGSS.MS-PS2-2