L1 Forces Intro
Transcript of L1 Forces Intro
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Forces
Ms Li
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10 June, 2012Learning Objectives
Recall and identify forces in everyday situations
Know that many forces act on an object
Homework
What are Newtons 3 laws of motion linked toforces
Starter
What is a force? Write down as many examples offorces you know
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STARTER Describe each of the forces you have identified.
________pulls thingsdownwards
________acts against anything movingthrough air
______keeps things afloat
_____acts against anything moving
Words
upthrust, air resistance (drag), friction, weight
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upthrust
frictionthrust
weight
tttttttttttWhaThrutt isthrust?
The force that pushes an objectforward.
Whuat is uptuuuuuuuhrust?
The force that pushes an object upwards in a liquid or a gas, also called buoyancy.
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upthrustor buoyancy
thrust
air resistance
friction
weight
Label the forces acting on the ferry as it sails to France.
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A force experienced by a magnetic material whenplaced in a magnetic field.
NS
iron filings locate the magnetic field and show the direction of the forces inthis region.
The region around amagnet where it has amagnetic effect is called itsmagnetic field.
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Divide the forces into groups according to
what the forces have in common.
Contact Forces Non-contact Forces
Friction gravity
Air/water resistance (drag) electrostatic
Thrust/driving force magnetic
Upthrust/reaction
Pull/push/twist
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(1) Which force on an airplane is always
directed toward the center of the earth?
(2) Which force on an airplane can also be
called a resistance force?
(3) Which force is responsible for moving the
airplane forward?
(4) Which force do the wings of the airplane
generate?
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Using a Forcemeter
Use the forcemeter to weigh different objects
What do you notice
Fill in the table on your sheet
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Magnets
Pull the magnets apart
Describe what is happening
Fill in the table on your sheet
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Knot on string
Tie a know, what force are you using?
Untie the knot, what force are you using?
If you had a plastic string, and made a knot,
would it be easier? Or harder? Why?
Fill in the table on your sheet
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Jump
Look at this picture
What is the force
Fill in the table on your sheet
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Paper
Piece of paper, how long does it take to fall?
Crumpled piece of paper, how long does ittake to fall?
Fill in the table on your sheet
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Ball
Drop the ball to the floor
What is happening
Fill in the table on your sheet
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Newton scales
Stand on the scales
What do you notice?
Fill in the table on your sheet
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Ship
Look at this picture
What is the force
Fill in the table on your sheet
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Aeroplane
Look at this picture
What is the force
Fill in the table on your sheet
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