1. Forces Balanced and Unbalanced Forces
Starter:
What is air resistance?
Explain why a parachute can slow a skydiver down.
How do we measure forces?
Why do you slip on ice?

2. Learning Intentions What is a balanced force?
What is an unbalanced force?
How do balanced and unbalanced forces effect the movement of objects?

3. What are the forces acting on this rocket?
Gravity
Air Resistance
Thrust
In terms of forces why does the rocket take off?

4. Forces
Are these three forces balanced or unbalanced?

5. Forces
What would happen if gravity was the biggest force?

6. Balanced and Unbalanced forces
If the forces acting on an object are the same size but acting in opposite directions, they will cancel each other out. The forces are balanced. The object will not move or be moving at a constant speed. If one force is bigger than the other, the object they are acting on speeds up, slows down or changes direction. The forces are unbalanced
Unbalanced
Balanced

7. Balanced and Unbalanced forces
In terms of balanced and unbalanced forces explain why:
the helicopter hovers
the rocket rises
Answer in sentences and name the forces acting on the objects

8. Balanced and Unbalanced Forces
What are the forces acting on this cup? Are they balanced or unbalanced?
The cup is pulled down by gravity
The table pushes back up
The size of these forces are equal, therefore the cup does not move.
The forces are balanced

9. Tug of War!
List all of the forces that are at work during a tug of war. In terms of forces describe why one team will win

10. Complete these questions in full sentences
What happens to the speed of an object when:
No force acts on it
All the forces acting on it are balanced
2) Draw a picture of a moving car and show the forces acting on it (use different sized arrows to show the size and direction of the forces).
3) Describe in terms of forces what will happen when:
the accelerator is pressed
the brake is pressed

11. Learning Intentions What is a balanced force?
What is an unbalanced force?
How do balanced and unbalanced forces effect the movement of objects?