A skydiver makes a controlled descent from an aeroplane to the ground. He
undergoes a number of seconds of freefall at his terminal speed before opening
his parachute, after which he decelerates to a new terminal speed. He continues to
fall at this speed for some time before landing on the ground.
Describe the motion of the skydiver starting from the moment he leaves the
aeroplane and finishing shortly before he hits the ground. You should divide the
descent into a number of phases. For each phase identify the vertical forces acting
upon the skydiver, and describe his motion using Newton’s laws. Where it is
useful to do so, as an approximation, you may treat the skydiver as behaving like
a sphere during his descent.
Remember to define the frame of reference that
you are using to describe the motion. You may ignore any horizontal forces and
As much detail answer preferable.
The Attempt at a Solution
minimum speed at start, increasing speed as time passes by. Until he hits the ground, where this is max speed. Vertical force going downwards increases as time goes by and upward vertical force decreases.
[answer so far=
phase A= skydiver jumps out of plane traveling at speed till reaches terminal velocity
phase B = opens parachute , skydiver decelaretes to new terminal velocity
phase C= skydiver continues at this speed till reaches ground
phase A: person jumps out, accelerates until reaches termainal velocity, then a = o.
Person opens chute...
Right after the chute is opened, acceleration up
phase B: drag and air resistance are the same. The chute changes the profile of the falling object. The shape of the object changes, so the drag force will change as well.
During the entire fall, there are only two vertical forces, gravity and the drag force. The drag depends upon several aspects of the falling object.
downward force- gravity,
upward force- air resistance
upwward force= drag and air resistance
upward force=no upward force when reached ground
?is this all ok?]