1. What makes us move and why we move in that particular way…
Motion and Forces
What makes us move and why we move in that particular way…

2. What Is Motion?
Motion: when an object changes position over time when compared with a reference point
Object In
Motion
Reference
Point

3. How Can We Describe Motion?
3 Ways To Categorize Motion
1. Position
2. Direction of Motion
3. Speed
Which way did he go, which way did he go???

4. Follow The Directions!!!!
The direction of the objects motion is dependent on the reference point
If the reference point changes, the direction of the object can also be looked at differently

5. What Makes An Object Move?
Force: a push or pull on an object
Characteristics of Forces
1. Have size
2. Direction
3. Units = Newtons
40.0 Newtons

6. Forces Control The Motion of an Object
If an object is in moving or even if it is sitting still, there are still forces acting upon it
GRAVITY
If the forces acting on the object are balanced, or equal to one another but in opposite directions…then the object doesn’t move.
If one of the forces is larger, it will move the object in the direction of that force
NORMAL FORCE

7. All Forces Control The Motion of the Object
We can use something called a Force Diagram
In Which Direction Will The Object Move?
40.0 N
25.0 N
15.0 N
Right

8. Net Force Easy Calculation 2 Scenarios If the forces are moving in the
same direction, add them
together
2. If the forces are moving in the
opposite direction, subtract
them, leaving the object to move in the direction of the greater force

9. Example
30.0 N
15.0 N
45.0 N
Left

10. Newton’s Laws An object in motion tends to stay in
motion unless acted upon by an
outside force
2. Force = mass x acceleration
3. For every action, there is an equal and opposite reaction

11. One Force Calculation Example
5.0 m/s2
500.0 kg
Force = mass x acceleration
Force = kg x 5.0 m/s2
Force = N to the left