What are we studying today?

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Presentation transcript:

What are we studying today? 3 words: 1: 2: OFF - F 3:

Objectives Be able to find the centre of mass of an object. 15 April 2019 Centre of mass Objectives Be able to find the centre of mass of an object.

Outcomes All MUST be able to describe what the centre of mass of a body is. MOST Should be able to apply their knowledge to find the COM for symmetrical objects.. SOME could explain how to find the centre of mass of a thin sheet of a material AQA Science © Nelson Thornes Ltd 2006 3

Definition: The centre of mass is that point at which the mass of the body may be thought to be concentrated. AQA Science © Nelson Thornes Ltd 2006 4

Centre of mass P3 1.2 What is the centre of mass? AQA Science © Nelson Thornes Ltd 2006 5

Click to find the centre of mass. AQA Science © Nelson Thornes Ltd 2006 6

AQA Science © Nelson Thornes Ltd 2006 7

Click to find the centre of mass. AQA Science © Nelson Thornes Ltd 2006 8

AQA Science © Nelson Thornes Ltd 2006 9

Click to find the centre of mass. AQA Science © Nelson Thornes Ltd 2006 10

AQA Science © Nelson Thornes Ltd 2006 11

Click to find the centre of mass. AQA Science © Nelson Thornes Ltd 2006 12

AQA Science © Nelson Thornes Ltd 2006 13

Click to find the centre of mass. AQA Science © Nelson Thornes Ltd 2006 14

AQA Science © Nelson Thornes Ltd 2006 15

Finding the centre of mass It is easy for symmetrical objects – Draw these shapes and show how to find the Centre of Mass for them : AQA Science © Nelson Thornes Ltd 2006 16

Non symmetrical objects Practical AQA Science © Nelson Thornes Ltd 2006 17

Centre of mass lies somewhere along this line Step 1 Suspend the object: Centre of mass lies somewhere along this line AQA Science © Nelson Thornes Ltd 2006 18

Centre of mass lies where the lines cross Step 2 Suspend the object from a different point: Centre of mass lies where the lines cross AQA Science © Nelson Thornes Ltd 2006 19

Stick in your object that you have found the centre of mass for and explain how you did it. AQA Science © Nelson Thornes Ltd 2006 20

What can you do? I most definitely can describe what the centre of mass of a body is. I should be able to apply their knowledge to find the COM for symmetrical objects. I may be able to explain how to find the centre of mass of a thin sheet of a material. Tell me what you thought was easy about this lesson and what was difficult. Anything that would help you in the future? AQA Science © Nelson Thornes Ltd 2006 21