Force

How to find weight

Unit of ...

Weight = N

mass = kg

a= m/s/s

W= FG

W= m(g)

How to find the net force

To find the net force you will add all forces in the same direction and then subtract forces on opposite direction to get the net force

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Gravity: Earth(9.8m/s/s) Moon(1.6m/s/s) Jupiter(23.9m/s/s)

Free body diagram

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The longer arrow = more N/ shorter arrow = Less N / slash = equal N so they cancel each other out

F and mass have a direct relationship

Force and acceleration have a direct relationship

Mass and Acceleration have an indirect relationshion

essay with free body diagram practice: Link here

If acceleration is positive it is speeding up, if it is negative it is slowing down, if it is 0 it is staying constant

When doing this problem we first solved to find the weight of the person which is 607.6 N. When the parachute was on a time of 11 seconds we subtracted the weight from the air resistance of 1,035 to get -427.4. After, we set an equation of -427.4= 62 (a) so we divided and got an acceleration of -6.9 m/s/s

Screen Shot 2020-04-23 at 9.52.20 AM

At 6 seconds, since the air resistance was equal to the weight the acceleration would be 0 because it cancelled out.

How to make a FBD

You draw all acting forces on the object at once

if the object is not moving up or down the FG = FW (force of water/ but if can be force of ground etc.)

F=ma+0

<----slope

we use slope to find the mass of the car

y=mx+b

Air resistance is negative when finding net force

Velocity

average velocity = vf+vi/2

displacement/ time

Inertia = the more mass the resistance is more

total forces applied on an object