physics 4.2
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9 Terms
inertia
the tendency to resist changes in motion; an object with lots of mass has lots of inertia, as a high resultant force is needed to have a noticeable effect on speed or direction
Newtons second law of motion
f res= a x m or a= f res/m → mass in kg, acceleration in m/s2
What is one thing newtons 2nd law of motion is also used for?
braking force needed to stop a car; a is negative
free fall
when gravity is only force acting on an object, accelerate with a speed of 9.81 m/s
Air resistance when skydiving
as speed increases, the air resistance does too, it keeps increasing until it is equal to gravity; then the person reaches terminal velocity and doesn’t accelerate (constant speed)
how to calculate distance
s = v avg x change in time
How to calculate (change in) time
change in time = change in speed / acceleration
How to calculate v avg
v avg = s / Δt
How to calculate Fres
F up - F down
Note 
Flashcards (229)