Terminal velocity

A parachutist of mass 75 kg jumps from a plane at a height of 4 000 m above sea level.

The parachutist falls through a distance of 2 400 m during the first 60 seconds. Calculate the average speed of the parachutist during this time.

• 20 ms^-1

• 40 ms^-1

• 67 ms^-1

• 80 ms^-1

Tags

NGSS.HS-PS2-1

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

• Balanced

• Unbalanced

Tags

NGSS.HS-PS2-1

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

• 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

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

Just after she jumps out of the plane (before the parachute opens). The sky diver will have

• a constant speed

• a constant acceleration

• a constant velocity

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

Describe the motion at point a. on the graph.

• constant speed
• 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 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

If a skydiver changes from a vertical to a horizontal position during freefall:

• His terminal speed would increase

• His terminal speed would decrease

• His terminal speed would stay the same