Transcript Movement and Change

Movement and Change
Using Newton’s 2nd Law
Newton’s 2nd law
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Newton’s 2nd law of
motion states that for
any object..
Acceleration is
proportional to the force
applied
Acceleration is
inversely proportional to
the mass of the object.
Newton’s 2nd law
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If we measure..
Mass in kg
Force in Newtons
Acceleration in m/s/s
Then we can say that
F = ma
(Force = mass x acceleration)
Newton’s 2nd law
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If F = ma
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a=F/m
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So for any object, if we know it’s mass
and the force acting on it, we can
calculate it’s acceleration.
Using the lab trolley’s
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If we know the mass of our lab trolleys and
the force applied to them, we can find the
acceleration.
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a =F/m
Predicted Results
Mass of trolley
(kg)
Force applied (N) Acceleration
(m/s/s)
1
2
3
4
5
Newton’s second law
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Use your predicted results table to construct
a graph of Acceleration against Force applied
for your trolley.
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Draw a line of best fit on this graph and label
the line predicted results.
Newton’s 2nd law
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Your teacher will now show you how to set
up the apparatus.
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You will need to find the ACTUAL
acceleration of your trolley when different
forces are applied using the ticker-tape timer.
Note why the ramp is not horizontal!
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Actual Results
Mass of trolley
(kg)
Force applied (N) Acceleration
(m/s/s)
1
2
3
4
5
Newton’s 2nd law
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Plot your ACTUAL results on the same graph
as your predicted results.
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In your own words explain what this result
shows you.
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Why is there a difference between the
predicted results and the actual results?
Using PHYSICS text book
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Read through p132 – 133
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Answer questions 1 & 2 on p133