physics 4.2

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 x t