1. Balanced and Unbalanced Forces

2. What is a force?
A force is a push or pull that causes an object to move, stop, or change direction
In physics a force is anything that makes an object accelerate

3. Force Forces come in pairs Forces have a magnitude and a direction
1 N (Newton) = 1 kg * m/s/s
Magnitude: 5N
Direction: north (up)
5N, north (up)

4. Balanced and Unbalanced Forces
Forces occur in pairs and they can be either balanced or unbalanced

5. Balanced Forces Balanced forces do not cause change in motion
They are equal in size and opposite in direction

6. Unbalanced Forces An unbalanced force always causes a change in motion
When unbalanced forces act in opposite directions you can find the net force
Net force
Magnitude
The difference between the two forces
Direction
Direction of the largest force

7. Unbalanced Forces
3 N, right – 6 N, left = 3N, left

8. Unbalanced Forces
4 N, left – 10 N, right =
6N, right

9. Unbalanced Forces
5 N, right + 10 N, right =
15N, right

10. Video Quiz- (6 Questions)
1. The Scientist who devised the 3 laws of motion was: A) Isaac Newton B) Albert Einstein C) Charles Darwin D) Thomas Edison

11. Video Quiz
2. The first law of motion states that if all the forces acting upon an object are BALANCED, then there will be: A) acceleration B) the object stopping C) no acceleration D) deceleration

12. Video Quiz
3. No acceleration means: A) increasing velocity OR the object is stationary B) constant velocity OR the object is stationary C) decreasing velocity OR the object is stationary

13. Video Quiz
4. The size of the force of gravity is an object's: A) density B) mass C) weight D) chemical structure

14. Video Quiz
5. When forces are BALANCED on an object, the object will either: A) decelerate OR accelerate B) start moving OR decelerate C) stop moving OR travel at a constant velocity D) remain stationary OR travel at a constant velocity

15. Video Quiz
6. When forces are UNBALANCED on an object, the object will either: A) remain stationary OR travel at a constant velocity B) accelerate OR decelerate C) start moving OR travel at a constant velocity D) stop moving OR travel at a constant velocity

16. Video Quiz- (6 Questions)
1. The Scientist who devised the 3 laws of motion was: A) Isaac Newton B) Albert Einstein C) Charles Darwin D) Thomas Edison

17. Video Quiz
2. The first law of motion states that if all the forces acting upon an object are BALANCED, then there will be: A) acceleration B) the object stopping C) no acceleration D) deceleration

18. Video Quiz
3. No acceleration means: A) increasing velocity OR the object is stationary B) constant velocity OR the object is stationary C) decreasing velocity OR the object is stationary

19. Video Quiz
4. The size of the force of gravity is an object's: A) density B) mass C) weight D) chemical structure

20. Video Quiz
5. When forces are BALANCED on an object, the object will either: A) decelerate OR accelerate B) start moving OR decelerate C) stop moving OR travel at a constant velocity D) remain stationary OR travel at a constant velocity

21. Video Quiz
6. When forces are UNBALANCED on an object, the object will either: A) remain stationary OR travel at a constant velocity B) accelerate OR decelerate C) start moving OR travel at a constant velocity D) stop moving OR travel at a constant velocity