falling objects

Question 1

force equation

Answer 1

mass x acceleration
F = ma

Question 2

if there’s no air resistance

Answer 2

the only force is an objects wait
all objects accelerate at the SAME RATE
so will land at the same time

Question 3

with air resistance

Answer 3

forces acting are weight and drag
only drag changes

Question 4

what changes drag

Answer 4

surface area
viscosity of fluid
speed of object

Question 5

why do heavier objects fall quicker

Answer 5

hammer has a bigger weight
so needs bigger drag to reach terminal velocity
so needs to keep getting faster
and will reach terminal velocity later
(terminal velocity will be faster)

Question 6

sky diver 1 jumps out of plane

Answer 6

little drag
so a resultant force downward
therefore accelerates greatly

Question 7

skydiver 2 curve gradient decreases

Answer 7

drag increases with speed so less resultant force
so rate of acceleration decreases
(is still getting faster thought)

Question 8

skydiver 3 highest flat line - curve levels out

Answer 8

eventual drag = wright so there is 0 resultant force and acceleration
TERMINAL VELOCITY REACHED

Question 9

skydiver 4 - parachute opens

Answer 9

large drag due to large surface area (bigger than weight)
resultant upward force
slows down

Question 10

skydiver 5 - lower flat line graph levels out

Answer 10

drag decreases due to slow speed
eventually drag = weight and a slower terminal velocity is reached

Question 11

skydiver 6 - hits ground

Answer 11

large contact force
decelerates to stationary