· 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"
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
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
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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