A force is defined as a push or pull that can be measured in Newtons. Multiple forces can act on an object simultaneously, and the combination of all these forces is called the net force. An unbalanced net force causes an object to change its motion by starting, stopping, or changing direction, while a balanced net force where forces are equal on both sides results in no movement. The document then introduces an activity involving balloon rocket races.

1. The Nature of Force

2. What is Force

3. What is Force
• A FORCE is a Push or Pull

4. What is Force
• A FORCE is a Push or Pull
• Force is Measured in Newtons

5. Combining Forces

6. Combining Forces
• Often More than one force can act on an
object

7. Combining Forces
• Often More than one force can act on an
object
• Combining of all forces acting
on an object is called Net Force

8. Combining Forces
• Often More than one force can act on an
object
• Combining of all forces acting
on an object is called Net Force

9. Unbalanced Forces

10. Unbalanced Forces
• Unbalanced Force can cause an object to
start, stop or change direction

11. Unbalanced Forces
• Unbalanced Force can cause an object to
start, stop or change direction

12. Unbalanced Forces
• Unbalanced Force can cause an object to
start, stop or change direction
• Balanced Forces: Balanced force on both
sides of an object resulting in NO movement

13. Activity
• Balloon Rocket Races