ib myp year 4 physics. the centre of mass [com] is a point in which the entire mass of the object...
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![Page 1: IB MYP Year 4 Physics. The Centre of Mass [COM] is a point in which the entire mass of the object is concentrated. If a FORCE acts on the COM of the](https://reader038.vdocuments.site/reader038/viewer/2022103023/56649db55503460f94aa6715/html5/thumbnails/1.jpg)
CENTRE OF MASSIB MYP Year 4
Physics
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THE LECTURE VIDEO [COM] The Centre of Mass [COM] is a point in which the entire mass of the object
is concentrated.
If a FORCE acts on the COM of the object, it will more likely accelerate in the direction of the force. [Recall the Newton’s 2nd Law of Motion]
If a force is applied on a point in the object other than the COM, the object will ROTATE/TURN about the COM itself.
If an object has a uniform density, the COM lies in the GEOMETRIC CENTRE of that object.
If an object’s density is not uniformly distributed, you would need to determine it by special methods.
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ACTIVITIES TODAY [COM] The class will be divided into 4 groups.
Your Group Number will be your WORKSHEET NUMBER.
You have to ensure that the TASK assigned to you [through the worksheet] is done within 30 minutes.
SHARING of learning experiences shall follow after the activity. [You’ll be assessed by classmates on this]
Exit Pass [?]
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GROUP 1 [THE MAGIC TRICK]
We believe that the centre of mass of the system is at ____________________________. We say this for the reason that ____________________________________.
Based from how we balanced the system, we can say that objects can be balanced when the centre of mass is placed ______________________________.
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GROUP 2 [THE CHAIR TRICKS]
Based from the observations while doing the activities, we can say that people balance their body by placing the centre of mass _________________________.
If the centre of mass is not above and within our feet, then we will __________________________________.
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GROUP 3 [THE F-15 BALANCING]
Compare the marks in the three activities you did. What do you call this point? ____________________________________.
Based from the observations during the activities, we can say that object can be balanced by ________________________.
The centre of mass of an object can be determined in many ways. Examples of which are ________________________.
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GROUP 4 [YOU AGAINST THE WALL]
Based from the result/experiences from the activities, we can say that people balance their body by placing the centre of mass ________________________________________________.
If the centre of mass is not above and within our feet, then we will ________________________________________________.
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ESSENTIAL CONCEPTS We can think of the COM as the point where GRAVITY acts on any object.
Thus, if the PIVOT POINT [or base] does not lie directly above or below it, there will be a TURNING EFFECT.
Methods to balance objects is simply locating the COM and support it with anything like our finger, fulcrum, etc..
We can also determine the COM using a PLUM BOB. The intersection of the lines [strings] is where the COM is.
You will not be able to balance yourself if your COM lies beyond the base [on your feet]. Same goes to any other object, i.e. they will be able to stand only if the COM lies BELOW or ABOVE and within the base.
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THE LEANING TOWER OF PISA
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ONE MORE CHAIR CHALLENGE
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EXIT PASS/FLIP CLASSROOM VIDEO Change
Transformation
Balanced
Centre of Mass
Stability
Gravity
“Log-on to ManageBac TONIGHT for the next FC Video or read my
latest post in our class WEBSITE.”