Posterous theme by Cory Watilo

1.15

·         1.15 recall and use the relationship between weight, mass and g:

   weight = mass × g                           

W = m × g      

 

 

 

 

Click here to download:
1B3ppt Mass vs Weight.ppt (169 KB)
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1.14 N1L, N2L and N3L

·         N1L = "If the forces on an object are balanced (resultant force = zero) the object either:

o    continues at rest

o    continues with a constant velocity"

 

·         N2L = "If the forces on an object are unbalanced it will accelerate in the direction of the unbalanced force"

 

Tablecloth trick XXXL

 

 

 

 

·         N3L = "For every action there is an equal and opposite reaction"

 

Weight and Mass

The differences between mass and weight

Mass

·        Mass is a measure of how much matter an object contains.

·        Mass is measured in kilograms.

·        Mass cannot change wherever you go in the universe.

Weight

·        Weight is the amount of downwards force acting upon an object due to gravity.

·        Weight is measured in Newtons.

·        Weight can change depending to the mass of an object.

1.14 Plenary Answers

1.14 Plenary Answers

21 September 2011

08:50

·         Watch the video

·         Tell the person next to you examples of when you can see

·         Newton's First Law

·         Newton's Second Law

acting on the Banana



   

 

 

 

   

Answers:

·         Newton's First Law

·         Initially when the man is holding the banana, the forces on it are balanced so its velocity is constant and zero

·         Newton's Second Law

·         When the man pushes the banana the forces on it are unbalanced so it accelerates to the left

·         Newton's First Law

·         When the banana is in mid flight, the forces on it are balanced so it moves with a constant positive velocity to the left

·         Newton's Second Law

·         When the banana hits the man's teeth the forces on it are unbalanced so it accelerates to the right (ie. it decelerates)

·         Newton's First Law

·         When the man catches the banana, the forces on it are balanced so its velocity is constant and zero