Simple Formulas
Fill In The Blank (g=10m/s/s)
Skydiving (by stepping gently off of a very high platform)
Forces with Simple? Kinematics
Net force as The Vector Sum of Individual Forces
100
Net force
ma
100
3kg
100
These are all of the forces acting on a falling skydiver.
Weight and drag
100
The tension in a rope that is raising a 60kg boat crash survivor with an upward acceleration of 1m/s/s.
[assume g=10m/s/s]
660N
100
T1-w1
200
Weight
mg
200
3m/s2
200
This describes the situation of an object that is falling through the air but not accelerating.
Terminal Velocity
200
If a 10 kg running child has a velocity of 5m/s one second after having a velocity of 3m/s, this is the horizontal force that the floor is exerting on the child.
20N
200
300
Friction
300
60N
300
The correct comparison of a skydiver's drag force at terminal velocity with a closed chute closed, versus the same skydiver's drag force at terminal velocity with the chute open. (Stronger, weaker, or the same)
Same
300
The weight of a 50kg person whose velocity is 8m/s after falling for 4 seconds on a strange planet.
100N
300
400
Tension in a string supporting a weight of mass m with acceleration a.
m(g+a)
400
0.6
400
The only point at which a skydiver is truly in freefall.
The beginning
400
The force required to constantly accelerate a 2kg block from rest over a distance of 12m, in 2 seconds.
12N
400
T2-w3
500
Reading of a scale that is supporting a mass m in an elevator when the mass m has an acceleration a.
m(g+a)
500
20N
500
The usual number of times Y acceleration enters positive territory during a skydive.
2
500
The approximate force of drag acting on a 100kg skydiver while descending 600m over a time of 200s, and then falling 1,200m over a time of 400s, and next further continuing to descend of 900m over the next 300s.
[assume g=10m/s/s]
1,000N
500
