1. Forces part 2

2. As a review.....
A force is a push or pull, or any action that has the ability to change motion.

3. Inertia
Resistance of any physical object to any change (motion, speed, velocity, rest).
It is a tendency for an object to travel in a straight line at a constant velocity

4. Force=mass x acceleration
Calculating force
Calculating the force of an object we need its
Mass and acceleration
Force=mass x acceleration
F= m x a

5. Calculating Acceleration
acceleration = Vf-Vi
time
like = mph/seconds

6. Gravity and Weight The force of gravity on an object is called weight.
Mass and weight are not the same thing!
(Mass = how much stuff)
(Weight = the force of gravity pulling on that stuff)

7. Weight
A 10-kilogram rock has a mass of 10 kilograms no matter where it is in the universe.
A 10-kilogram rock’s weight however, can vary greatly depending on where it is.

8. 2 rules for gravity....
Bigger objects have a stronger gravitational force
Closer objects have a stronger gravitational force

9. Terminal velocity
Terminal velocity = point you stop accelerating to earth as you fall down
Gravity accelerates you towards the earth but the air pushes you back up creating drag.
Terminal velocity= 54 meters/second