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Motion and ForcesMotion and Forces
What makes us move and why we What makes us move and why we move in that particular way…move in that particular way…
What Is Motion?What Is Motion?
• MotionMotion: when an object changes when an object changes position over time when compared position over time when compared with a reference pointwith a reference point
Reference Reference PointPoint
Object Object In In
MotionMotion
How Can We Describe How Can We Describe Motion?Motion?
• 3 Ways To Categorize Motion3 Ways To Categorize Motion
1. Position1. Position
2. Direction of Motion 2. Direction of Motion
3. Speed3. Speed
Which way did he go, which way did he go???
Follow The Directions!!!!Follow The Directions!!!!
The direction of the The direction of the objects motion is objects motion is dependentdependent on the on the reference pointreference point
If the reference point If the reference point changeschanges, the direction , the direction of the object can also of the object can also be looked at differentlybe looked at differently
What Makes An Object What Makes An Object Move?Move?
• ForceForce: a push or pull on an object: a push or pull on an object
Characteristics of ForcesCharacteristics of Forces
1. Have size
2. Direction
40 Newtons40 Newtons
3. Units = Newtons
Forces Control The Motion of Forces Control The Motion of an Objectan Object• If an object is in moving or even if it is sitting
still, there are still forces acting upon it
If the forces acting on the If the forces acting on the object are balanced, or object are balanced, or equal to one another but equal to one another but in opposite directions…in opposite directions…then the object doesn’t then the object doesn’t move.move.
If one of the forces is If one of the forces is larger, it will move the larger, it will move the object in the direction of object in the direction of that force that force
All Forces Control The All Forces Control The Motion of the ObjectMotion of the Object
• We can use something called a Force We can use something called a Force DiagramDiagram
Net ForceNet Force
• Easy CalculationEasy Calculation
2 Scenarios2 Scenarios
1. If the forces are moving in the samesame direction, addadd them together
2. If the forces are moving in the oppositeopposite direction, subtractsubtract them, leaving the object to move
in the direction of the greater force
Newton’s LawsNewton’s Laws
1.1. An object in motion tends to stay inAn object in motion tends to stay in motion unless acted upon by anmotion unless acted upon by an outside forceoutside force
2. Force = mass x acceleration2. Force = mass x acceleration
3. For every action, there is an equal 3. For every action, there is an equal and opposite reactionand opposite reaction