1. What is a free-body force diagram?
Force is a vector quantity
Therefore, the effect of a force depends on its magnitude and direction
We can draw forces as vectors ( ) to help us break down all the different forces that are acting on an object
Free body diagram = A diagram of an object that shows the size and direction of all forces acting on it

2. What forces are acting on the CARRIAGE?
Brainstorm all the forces acting on the car
Tow truck
-road
-gravity

3. How do we develop a free-body force diagram?
 Use these questions each time
Is there gravity? Fg
Is the object on a surface? FN (normal)
Is the object being pulled or pushed? Fa (applied)
Is there friction on a surface? Ff
Is there air resistance? Fair
Is the object hanging? Ft (tension)
Which way are all of these forces pulling the object?
Brainstorm all the forces acting on the car
Tow truck
-road
-gravity

4. What forces are acting on the CARRIAGE?
Brainstorm all the forces acting on the car
Tow truck
-road
-gravity

5. How do we develop a free-body force diagram?
Force of Ground (Normal Force) FN
Force of the horse
Force of Friction FF FA
Brainstorm all the forces acting on the car
Tow truck
-road
-gravity
Force of Gravity Fg

6. Draw the free-body diagram of a soccer ball being kicked
What are the forces on the soccer ball?
Which way should the forces be drawn?

7. Draw the free-body diagram of a soccer ball being kicked
What are the forces on the soccer ball?
Which way should the forces be drawn? FN
Force of Ground (Normal Force)
Force of Kick FA FG
Force of Gravity