This document outlines a lesson on forces. It aims to teach students to: 1) Identify different types of forces and how they affect objects. 2) Explain how forces can affect an object's motion. 3) Compare the sizes of opposing forces and how unbalanced forces affect motion. The lesson investigates friction by having students measure the force needed to drag a shoe on different surfaces. It also explains how balanced and unbalanced forces impact whether an object is stationary, accelerates, or decelerates.

2. Aims: By the end of this lesson you will have been
given the opportunity to achieve a;
Level 3 by identifying some different types of force
and say what they can do to an object
Level 4 explain how forces can affect motion
Level 5 compare the different size of forces to
suggest what happens when they are unbalanced

3. What forces are there?
Make a list in your books

4. What can these forces do to objects?

5. Aims: By the end of this lesson you will have been
given the opportunity to achieve a;
Level 3 by identifying some different types of force
and say what they can do to an object
Level 4 explain how forces can affect motion
Level 5 compare the different size of forces to
suggest what happens when they are unbalanced

6. I want you to investigate one type of force today FRICTION
Which surface would be best for slipping on?
1. Use the Newton metre to drag the shoe
2. Read how much force (Newton's) is needed to move the shoe
3. Repeat on different surfaces
Surface Force needed to drag shoe (N)
Idea for a results table...

7. Conclusion
I found out that ....................................... because.....................
Level 3
State what you
found out
Level 4
Say why

8. Aims: By the end of this lesson you will have been
given the opportunity to achieve a;
Level 3 by identifying some different types of force
and say what they can do to an object
Level 4 explain how forces can affect motion
Level 5 compare the different size of forces to
suggest what happens when they are unbalanced

9. Balanced and Unbalanced Forces
Why?

10. RESULTANT FORCES
When 2 or more forces act on an object they can be
replaced by a single force called the RESULTANT FORCE
6N
6N
12N

11. RESULTANT FORCES
4N4N
0N

12. RESULTANT FORCES
29N
16N
1N
12N

13. BALANCED FORCES
3N3N
OBJECT AT REST (STATIONARY)
RESULTANT FORCE = 3N – 3N = 0N
OBJECT REMAINS AT REST (STATIONARY)

14. BALANCED FORCES
3N3N
MOVING OBJECT
RESULTANT FORCE = 3N – 3N = 0N
OBJECT TRAVELS AT CONSTANT SPEED

15. UNBALANCED FORCES
6N3N
MOVING OBJECT
RESULTANT FORCE = 6N – 3N = 3N
OBJECT INCREASES SPEED FROM SPEED ORIGINALLY
MOVING AT

16. UNBALANCED FORCES
3N6N
MOVING OBJECT
RESULTANT FORCE = 6N – 3N = 3N
OBJECT SLOWS DOWN FROM SPEED ORIGINALLY
MOVING AT (DECELERATES)

17. Balanced and Unbalanced
Forces
1) When the forces are
_________ an object is
either ________ or moving
with _____ _____.
2) When the force is
greater forward. The
object is getting
_________.
3) When the force is greater
backward. The object is getting
_______.

18. Check you answers
1) When the forces are
_balanced__ an object is
either _stationary__ or
moving with _steady speed.
2) When the force is
greater forward. The
object is moving
_forward_.
3) When the force is greater
backward. The object is moving
_backwards_.

19. Aims: By the end of this lesson you will have been
given the opportunity to achieve a;
Level 3 by identifying some different types of force
and say what they can do to an object
Level 4 explain how forces can affect motion
Level 5 compare the different size of forces to
suggest what happens when they are unbalanced