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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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