1. Reminder:
We are covering this because the average score on this benchmark was 40%!
SC.6.P.13.3 Investigate and describe that an unbalanced force acting on an object changes its speed, or direction of motion, or both.
SC.6.P.12.1 Measure and graph distance versus time for an object moving at a constant speed. Interpret this relationship.

2. Benchmark Break ↓ Balanced Forces Unbalanced Forces
Day One Agenda
Benchmark Break ↓
Balanced Forces
Unbalanced Forces
Big Ole Box Example
Airplane Example
Formative Checkpoint

3. Benchmark Break ↓
SC.6.P.13.3 Investigate and describe that an unbalanced force acting on an object changes its speed, or direction of motion, or both.
REWRITE:
KNOW: Balanced forces result in an object at rest. Unbalanced forces require the calculation of net force AND the direction of motion.
DO: Describe the different forces acting on an object. Calculate and predict the net force and/or direction in scenarios.

4. Balanced Forces
Objects at rest (not moving) are a result of balanced forces.
Gravity pulls you down. The floor or your chair pushes upward.
Newton’s Rule: Objects at rest will stay at rest until a new force acts on it.

5. Unbalanced Forces
When forces on an object are Unbalanced, it results in motion.
Applying force changes an object’s speed and/or direction.

6. Big Ole Box Example Gravity and the floor’s force are balanced.
Which direction will the box move?
With how much force will it be moving?
GRAVITY
YOU Push with 50 N of force
Big Ole Box of Books
To the right…
Friction opposes motion with 10 N
FLOOR
40 N of force

7. Airplane Example What causes drag?
Friction between the plane and air.
What would cause the airplane to descend towards the ground?
If the lift is less than the weight (unbalanced)

8. Objects Stay at Rest Until a New Force Acts Upon It!

9. FORMATIVE CHECKPOINT DAY #1
What happens when the forces applied to an object at rest produce a net force of zero?
The object will move at constant speed.
The object will have positive acceleration.
The object will have negative acceleration.
The object will not move at all.

10. Benchmark Break ↓ Formative Checkpoint Positive/Negative Acceleration
Day Two Agenda
Benchmark Break ↓
Positive/Negative Acceleration
Speed=Distance/Time
Interpreting D vs T Graphs
Step-By-Step Video
Formative Checkpoint

11. Benchmark Break ↓
SC.6.P.12.1 Measure and graph distance versus time for an object moving at a constant speed. Interpret this relationship.
REWRITE:
KNOW: How to interpret a D vs T graph to describe the motion of object(s).
DO: Interpret a distance vs time graph by explaining where + or – acceleration is taking place, or when an object is holding still.

12. Positive and Negative Acceleration
Positive Acceleration: When an object increases its speed. (speeds up)
Negative Acceleration: When an object decreases its speed. (slows down)
Negative Acceleration
25 km/h
50 km/h

13. Positive and Negative Acceleration
Origin: Where you start.
Moving away from origin.
Returning to Origin

14. Speed= Distance/Time (like miles per hour in your car)
What is the speed from point A→B?
0.6 km/hr
What is the speed from point C→D?
2.25 km/hr

15. Interpreting D vs T Graphs
What is happening between B→C and D→E?
The object is holding still!
What is the speed from E→F?
2 km/h Headed back to the origin.

16. Interpreting D vs T Graphs

17. Day Two Formative Assessment
Cheyenne is drawing a graph that shows four different objects and the distance each object travels in 5 seconds. Which line on the graph shows the object that is traveling with the fastest constant speed?