Unit 1 discusses forces and motion. It defines force and its magnitude, direction, and line of action. Balanced forces result in no change in motion, while unbalanced forces cause acceleration by increasing or decreasing an object's velocity. The net force on an object is determined by combining all individual forces acting on it, with direction indicated by plus and minus signs. Students are assigned questions evaluating their understanding of the relationships between forces, motion, and acceleration.

1. Unit 1: Forces,
Motion, and Energy

2. Lesson 1: Forces and Motion
Push and pull is referred to as Force (F).
Terms:
Magnitude: Newton (N)
Direction of the force
Magnitude of the force
The line of action

3. Activity 1: Short Quiz

4. Activity 2: Forces on Object at Rest
(Hanging a Pen)

5. Balanced Forces

6. The object is at rest
because of equal in
magnitude direction, and
lie along the same line of
action.

7. Unbalanced Forces

8. The object changes its state of
motion hence we say that it
accelerates.
Acceleration is the increase and
decrease of velocity.

9. Combining Forces

10. To determine the net force . + and - indicate
the direction of forces.
Example:
Unbalanced force could cause a change in an
object’s state of motion.

11. Evaluation

12. Assignment: half crosswise
1. Do forces always result in motion?
2. What are the conditions for an object to:
a.) at rest
b.) keep moving at constant velocity
c.) move with increasing velocity
3. How is force related to acceleration?