Terminal Velocity (H)

Just after she jumps out of the plane (before the parachute opens). The net force will be

• zero

• upward

• downward

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Describe the motion at point a. on the graph.

• constant speed
• accelerating
• decelerating
• stationary

Tags

NGSS.HS-PS2-1

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

When a parachute canopy is opened more drag is created because:

• It has a large mass

• It has a large surface area

• It is travelling at terminal speed

• The person is now vertical

Identify true statements:

• The parachutist has just left the plane

• Weight is increasing

• There is no drag

• Weight is constant

• Deceleration

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

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

• He is decelerating
• He is accelerating
• He has reached a faster constant speed
• He has reached a lower constant speed. 

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

John, of 68kg dives out of an aeroplane

a) What is John's weight

b) What happens to John's weight as he falls?

• a) 0.68N

  b) stays the same

• a) 680N

  b) stays the same

• a) 680N

  b) increases

• a) 0.68N

  b) decreases

When a skydiver is falling what happens to

a) her velocity

b) the air resistance?

• a) Increases

  b) increases

• a) increases

  b) decreases

• a) increases

  b) stays the same

• a) stays the same

  b) increases

Explain why the skydiver will eventually stop accelerating

• The air resistance continues to increase as long as the velocity increases. When the air resistance reaches the same value as the weight there will be no resultant force, hence no acceleration (F=ma)

• The air resistance continues to decrease as long as the velocity increases. When the air resistance is larger than the weight there will be no resultant force, hence no acceleration (F=ma)

• The air resistance stays the same so the velocity increases. There will be no resultant force, hence no acceleration (F=ma)

• The air resistance continues to increase as long as the velocity increases. When the air resistance reaches the same value as the weight there will be an increase in acceleration