1. What is the net force on an object at rest?
DO NOW
What is the net force on an object at rest?

2. Remember… Forces At Rest
Objects at rest have forces acting on them that are balanced (equal).
The net force is 0N.

3. SWBAT calculate the net force on an object.
Objective
SWBAT calculate the net force on an object.

4. Pre-Test Question #1 What is the force net force in the picture?
a. 10 N up.
b. 15 N to the right.
c. 20 N to the right.

5. Net force means the total force acting on the object.

6. Free Body Diagrams (FBD)
To show all of the forces acting on an object, we create drawings called free body diagrams.
We can use numbers or the type of forces.

7. Net force = ___________ N to the __________________
Teacher Practice Problem: Part 1 Nina is pushing a box. Nina is pushing it to the right with a force of 7 N. Draw the free-body diagram.
Net force = ___________ N
to the __________________

8. Net force = ___________ N to the __________________
Together Practice problem: Part 2 Nina and Fernanda are pushing a box. Nina is pushing it to the right with a force of 7 N, and Fernanda is pushing it to the right with a force of 8 N. Draw the free-body diagram.
Net force = ___________ N
to the __________________

9. Net force = ___________ N to the __________________
Try it by yourself Practice problem: Part 3 Nina and Fernanda are pushing a box. Nina is pushing it to the right with a force of 7 N, and Fernanda is pushing it to the right with a force of 8 N. Luis comes and pushes it to the left with a force of 20N.
Net force = ___________ N
to the __________________